Browsing by Author "Arya, Anil"

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Argon ion implanted CR-39 polymer: Optical and structural characterization
(Elsevier B.V., 2021-04-03T00:00:00) Chhokkar, Preeti; Kumar, V.; Goyal, Parveen K.; Kumar, Shyam; Tomar, A.K.; Gaur, Anurag; Arya, Anil
The samples of Polyallyl diglycol Carbonate (CR-39) were implanted with 100 keV argon ions at fluences 1 � 1015, 5 � 1015 and 1 � 1016 ions/cm2 to be employed for optical and structural studies. The changes in transmittance, reflectance, optical energy gap and refractive index have been studied through the UV�Vis�NIR spectroscopic technique. The enhancement in reflectivity and a strong reduction in transmittance, particularly in the UV region, are observed after Ar+ implantation in CR-39 samples. The absorbance value remains low ~0.10, 0.15 and 0.20 in the key communication wavelength region i.e. 800�1600 nm for sample implanted at the fluence of 1 � 1015, 5 � 1015, 1 � 1016 Ar+/cm2, respectively. The Optical energy gap (EOPT) is determined to be 0.92 eV for the implanted layer of the sample implanted at the fluence of 1 � 1016 Ar+/cm2, whereas 3.70 eV for the pristine sample. The surface electrical conductivity is increased from ~1.49 � 10?14 S (pristine sample) to ~8.34 � 10?10 S for sample implanted at the fluence of 1 � 1016 Ar+/cm2. The formation of conjugated ?-bond (-C[dbnd]C-) structure with Ar+ implantation is confirmed via FTIR and Raman measurements. TGA results are analysed in detail and are found to be in strong agreement with the changes observed in different properties of CR-39 after ion implantation. � 2021 Elsevier B.V.
Challenges and Perspectives of Li-Ion Batteries, Supercapacitors, and Hydroelectric Cells
(CRC Press, 2021-09-06T00:00:00) Arya, Anil; Gaur, Anurag; Sharma, A.L.
This chapter provides an overview of challenges faced by different devices and their remedies. Supercapacitors are energy storage devices and have gained the attention of the scientific community due to their high power density, long cycle life, and a broad range of applications. The existing carbon/metal oxide-based electrode symmetric cell has a lower energy density. Energy density is an important parameter that needs to be improved with the existing high power density. The only feasible strategy is the development of hybrid architecture. The cell performance is strongly influenced by the contact between different components of the cell. The contact between the current collector as well as the active material needs to be improved for minimizing the interfacial resistance and for improving the charge transferability of the electrode material. The energy production through hydroelectric cells, based on metal oxides and their composites, by the splitting of water has turned out to be a feasible alternative to other green energy sources. � 2022 Taylor & Francis Group, LLC.
A comprehensive review on defect passivation and gradient energy alignment strategies for highly efficient perovskite solar cells
(IOP Publishing Ltd, 2021-10-07T00:00:00) Saykar, Nilesh G.; Arya, Anil; Mahapatra, S.K.
Recent advances in photovoltaic devices demonstrate a potential candidature of the lead halide perovskite solar cells (PSCs) to fulfill the all-electric future of the world. Further improvements in efficiency and stability require minimization of non-radiative recombination arising due to the tr ap states created by the vacancies and defects. The device's performance is mostly determined by the perovskite absorber material, which has single-cation, mixed-cation, and/or mixed-halide composition-dependent optoelectronic capabilities. Herein, we present an insight on the state of the art of PSCs, including types of defects, their effects, and remedies of the same. Various design strategies administered to grow highly crystalline perovskite films with low defects at interfaces are described in detail. The inclusion of a few nm thin interlayer between perovskite and charge transport layer (CTL) is an effective way to passivate the defect at the interface. Furthermore, additive engineering is emerging as an excellent strategy to grow the defect-free perovskite by simply adding a polymer, ionic liquids, organic/inorganic salts in precursor solution without precipitating after film formation. The mitigation of charge recombination could be achieved by efficient charge extraction through proper energy alignment of CTLs and absorbers. Notably, we emphasize the interface, additive, and gradient band alignment engineering and resulting improvement in the photocurrent density, photovoltage, power conversion efficiency, and long-term stability. The present review gives complete information about PSCs, starting from the selection of the materials to PSC fabrication, charge carrier dynamics, defects, effects, and remedies. We hope that this summarised information will give a basic understanding of designing new passivation strategies for advancing PSC's present state of the art. � 2021 IOP Publishing Ltd.
Conductivity and stability properties of solid polymer electrolyte based on PEO-PAN + LiPF 6 for energy storage
(Applied SCience Letters, 2016) Arya, Anil; Sharma, A. L.
Ionically conducting solid polymer electrolyte (SPE) films has drawn considerable attention because of its many appealing properties such as flexibility, design mouldability, role as leakage free solid separator/electrolyte in devices and improved safety hazard. Polymer blend electrolytes are prepared for various concentration of salt ( ) with the constant ratio (0.5 gm) of each PEO and PAN polymers (blend polymer) using solution casting technique. The maximum ac ionic conductivity value is found to be of the order of ~10-5 S cm-1 for the film having = 4 support the applicability of films for the energy storage/conversion device application. The thermo gravimetric analysis (TGA) result shows the stability of the prepared films for use in the device application. Finally the cyclic voltammetry experiment was performed to see the voltage sustainability (~4 Volt) of prepared free standing solid polymeric films for the device applications.
Construction of three-dimensional marigold flower-shaped Ni3V2O8 for efficient solid-state supercapacitor applications
(John Wiley and Sons Inc, 2022-06-13T00:00:00) Haldar, Krishna K.; Biswas, Rathindranath; Arya, Anil; Ahmed, Imtiaz; Tanwar, Shweta; Sharma, Achchhe Lal
Development of binary spinel-type mixed metal oxide and fabrication various morphological heterostructure nanomaterials having two distinct metals paid a wide attention in emerging field. Here, we prepared three-dimensional (3D) marigold flower-like Ni3V2O8 structure via a simple and facile technique for electrochemical supercapacitor applications. 3D Ni3V2O8 with thick petals as cathode materials exhibits high specific capacitance of 263.12 F g?1 at a scan rate of 0.5�mA cm?2. The high energy density of 32.98 W h kg?1 at power density of 189.96 W kg?1 is obtained by the cathode formation of marigold flower-shaped Ni3V2O8, indicating excellent ions accessibility and large charge storage ability of Ni3V2O8 structure. It is also observed that even after 5000 cycles charging-discharging profile analysis, Ni3V2O8 cathode retains 32% of its initial capacitance along with 100% Coulombic efficiency. This higher capacitance retention strengthens its adoption as a potential candidate for supercapacitor application. � 2022 John Wiley & Sons Ltd.
Dielectric Relaxations and Transport Properties Parameter analysis of novel blended solid polymer electrolyte for Sodium Ion Rechargeable Batteries
(Springer, 2019) Pritam; Arya, Anil; Sharma, Achchhe Lal
A novel blended solid polymer electrolyte comprising polyethylene oxide and polyvinylpyrrolidone polymers for blending and sodium nitrate (NaNO3) as ion conducting species has been optimized via standard solution-cast technique. XRD, FESEM, and FTIR were performed to obtain the information about the structural changes, morphology, and microstructural changes (polymer–ion and ion–ion interactions) of the solid polymer electrolyte films. The electrochemical impedance spectroscopy, linear sweep voltammetry, and i–t characteristics were performed to evaluate the ionic conductivity, voltage stability window, and ion transference number. The impedance study was done in a broad temperature range (40–100 °C). The DSC and TGA were used to obtain information about the thermal transitions and thermal stability of prepared films. The ion dynamics is further investigated by analyzing the complex permittivity, loss tangent, and complex conductivity. All the plots were fitted through established theoretical model/expressions in whole frequency window to obtain dielectric strength, ion conduction path behavior, and relaxation time. Transport parameters such as number density (n), mobility (μ), and diffusion coefficient (D) of mobile ions were obtained by three methods and compared satisfactorily. Lastly, a coherent mechanism for the migration of charge transport carriers within the solid polymer composites has been proposed based on the performed experimental outcome
Dielectric study of polymer nanocomposite films for energy storage applications
(Springer Science and Business Media, LLC, 2017) Sadiq, M.; Arya, Anil; Sharma, Achchhe Lal
In the present study we have a novel report on the types of dielectric studies of the two blend polymer consisting of polyacrylonitrile (PAN) as the host polymer-polyethylene oxide (PEO) as a copolymer, LiPF6 as lithium salts and clay containing different weight percent of DMMT as modified montmorillonite. The polymer nanocomposite (PNC) films were prepared by using solution cast technique. However the pure PAN-PEO+LiPF6 film was prepared as a reference. Keeping in view of characterization of PNCs films were study by impedance spectroscopy technique. The high frequency range of dielectric measurement is 1 Hz-1 MHz. This technique is shown to be a viable and straight forward means of obtaining dielectric data on polymer electrolytes. Permittivity (??), dielectric loss (??) and a.c. conductivity variation with frequency was studied to estimate the relaxation times for PAN-PEO polymer electrolyte. ? Springer International Publishing Switzerland 2017.
Effect of Nano-Filler on the Properties of Polymer Nanocomposite Films of PEO/PAN Complexed with NaPF 6
(Journal of Materials Science and Engineering B 5, 2016) Bhatt, Chandni; Swaroop, Ram; Arya, Anil; Sharma, A. L.
Free standing transparent PNC (Polymer nanocomposite) films based on PEO/PAN + NaPF 6 with different concentration (wt./wt.) filler of nano sized (TiO 2 ) is synthesized by using standard solution cast technique. HRXRD (High resolution X -ray diffraction) and FESEM (Field emission scanning electron microscopy) have been performed to see the structural and microstructural behavior of the PNC films. The microscopic interaction among polymer, salt and nano-ceramic filler has been analyzed by FTIR (Fourier transformed infra-red) spectroscopy. The reduction of ion pair formation in polymeric separator is clearly observed on addition of nano-filler in the polymer salt complex film. Electrical (ionic/electronic) conductivity has been estimated (~ 10 -4 S/cm) optimized PNC films concentration of nanofiller (15 Wt.%). The estimated value of electrical conductivity is well corroborated by FTIR study. Thermal analysis has been done with thermo gravimetry analysis to find out thermal stability of PNC films. Transport properties associated due to majority mobile carriers ions and only negligible participation from electrons was observed through transport number analysis. The band gap (i.e. direct as well as indirect) decreases on the addition of nano-filler observed from the optical analysis. The estimated result of the prepared PNC films are at par with desired value for the device application.
Effect of salt concentration on dielectric properties of Li-ion conducting blend polymer electrolytes
(Springer, 2018) Arya, Anil; Sharma, Achchhe Lal
In the present article, we have studied the effect of the salt concentration (LiPF6) on transport properties and ion dynamics of blend solid polymer electrolyte (PEO-PAN) prepared by solution cast technique. Fourier transform infrared (FTIR) spectroscopy confirms the presence of microscopic interactions such as polymer-ion and ion-ion interaction evidenced by a change in peak area of anion stretching mode. The fraction of free anions and ion pairs obtained from the analysis of FTIR implies that both influence the ionic conductivity with different salt concentration. The complex dielectric permittivity, dielectric loss, complex conductivity have been analyzed and fitted in the entire frequency range (1 Hz-1 MHz) at room temperature. The addition of salt augments the dielectric constant and shift of relaxation peak in loss tangent plot toward high frequency indicates a decrease of relaxation time. We have implemented the Sigma representation (σ'' vs. σ') for solid lithium ion conducting films which provide better insight toward understating of the dispersion region in Cole-Cole plot (ε'' vs. ε') in lower frequency window. The dielectric strength, relaxation time and hopping frequency are in correlation with the conductivity which reveals the authenticity of results. Finally, the ion transport mechanism was proposed for getting the better understanding of the ion migration in the polymer matrix.
Electrolyte for Energy Storage/Conversion (Li+, Na+, Mg2+) Devices Based on PVC and Their Associated Polymer: A Comprehensive Review
(Springer, 2019) Arya, Anil; Sharma, Achchhe Lal
Encouraged by the first report of ionic conductivity in 1973 and the consequent boom for the need of clean and green renewable energy resources, there has been a marked increase toward R&D of polymer electrolytes cum separator for energy storage devices. The most suitable alternative to the conventional energy storage devices is battery and it has the potential to fulfill the energy demand and could be used for storing energy produced from different alternative resources, i.e., wind/hydro/solar energy. Electrolyte is a key component of battery that plays a crucial role in its overall performance. The draft of the article is an attempt to present a coherent yet concise review of Li, Na, and Mg batteries using polymer electrolytes. The main topics given focus in this review are an introduction to properties shaping the polymer electrolytes, types of polymer electrolytes, and properties of constituents of polymer electrolytes (polymer host, salt, solvent, ionic liquid, plasticizer, nanofiller, nanoclay, nanorod, nanowire). The approaches to enhance the electrochemical properties are presented with a suitable ion transport mechanism. A special section is introduced to cover dendrite growth and strategies to suppress it. Important preparation methods and characterization techniques are introduced. The synopses of the experimental investigations are presented for ionic liquid/gel/composite polymer electrolytes. Finally, the future outlook highlights the further development for the next-generation energy storage devices.
Electrolytes for Li-Ion Batteries and Supercapacitors
(CRC Press, 2021-09-06T00:00:00) Arya, Anil; Pandey, Lokesh; Gaur, Anurag; Kumar, Vijay; Sharma, A.L.
This chapter is dedicated to the electrolyte that is a crucial component of any device. Electrolyte plays a dual role in the device, acts as a carpet for electrolyte ions, and also separates the electrodes to avoid short-circuiting or explosion. Initially, the characteristics parameter and selection criteria for the electrolyte will be discussed. Then, the organic electrolytes have been discussed followed by a focus on emerging novel gel/solid polymer electrolytes for application in battery and supercapacitor. The performance of the battery and supercapacitor is shown for different electrolytes. � 2022 Taylor & Francis Group, LLC.
Energy Storage and Conversion Devices: Supercapacitors, Batteries, and Hydroelectric Cells
(CRC Press, 2021-09-06T00:00:00) Gaur, Anurag; Sharma, A.L.; Arya, Anil
This book presents a state-of-the-art overview of the research and development in designing electrode and electrolyte materials for Li-ion batteries and supercapacitors. Further, green energy production via the water splitting approach by the hydroelectric cell is also explored. Features include: � Provides details on the latest trends in design and optimization of electrode and electrolyte materials with key focus on enhancement of energy storage and conversion device performance � Focuses on existing nanostructured electrodes and polymer electrolytes for device fabrication, as well as new promising research routes toward the development of new materials for improving device performance � Features a dedicated chapter that explores electricity generation by dissociating water through hydroelectric cells, which are a nontoxic and green source of energy production � Describes challenges and offers a vision for next-generation devices This book is beneficial for advanced students and professionals working in energy storage across the disciplines of physics, materials science, chemistry, and chemical engineering. It is also a valuable reference for manufacturers of electrode/electrolyte materials for energy storage devices and hydroelectric cells. � 2022 Taylor & Francis Group, LLC.
Enhanced Curie temperature and superior temperature stability by site selected doping in BCZT based lead-free ceramics
(Elsevier Ltd, 2022-01-31T00:00:00) Kumari, Sapna; Kumar, Amit; Kumar, Aman; Kumar, V.; Thakur, Vikas N.; Kumar, Ashok; Goyal, P.K.; Gaur, Anurag; Arya, Anil; Sharma, A.L.
In this work, Bi3+ doped Ba0.98-3x/2BixCa0.02Zr0.02Ti0.976Cu0.008O3 [0 ? x ? 0.03] lead free ceramics, to be employed for structural, dielectric and ferroelectric studies, have been synthesized via conventional solid state reaction method. Rietveld refinement of the X-ray diffraction (XRD) data evidences the existence of a pure perovskite phase with tetragonal symmetry for all ceramics. The Scanning Electron Microscopy (SEM) reveals that the grain size, which is 16.14 ?m for x = 0 reduced to 2.11 ?m for x = 0.03. Dielectric studies demonstrate excellent dielectric behavior with high Curie temperature (TC ?159 �C), high dielectric constant (?r ?834, ?max ? 3146), and a low dielectric loss (tan? ? 0.019), for an optimum value of x = 0.02. The analysis of temperature coefficient of the dielectric permittivity indicates the applicability of these materials in multilayer ceramic capacitors. Impedance studies, conducted to understand the underlying physical mechanisms, are found to be in good agreement with the results of structural and dielectric studies. Furthermore, the ferroelectric measurement confirms the ferroelectric nature for all samples with an energy storage efficiency (?) of ?42% for x = 0.02 composition. � 2022 Elsevier Ltd and Techna Group S.r.l.
Exploring the magic bullets to identify Achilles� heel in SARS-CoV-2: Delving deeper into the sea of possible therapeutic options in Covid-19 disease: An update
(Elsevier Ltd, 2020-11-27T00:00:00) Thakur, Shikha; Mayank; Sarkar, Bibekananda; Ansari, Arshad J.; Khandelwal, Akanksha; Arya, Anil; Poduri, Ramarao; Joshi, Gaurav
The symptoms associated with Covid-19 caused by SARS-CoV-2 in severe conditions can cause multiple organ failure and fatality via a plethora of mechanisms, and it is essential to discover the efficacious and safe drug. For this, a successful strategy is to inhibit in different stages of the SARS-CoV-2 life cycle and host cell reactions. The current review briefly put forth the summary of the SARS-CoV-2 pandemic and highlight the critical areas of understanding in genomics, proteomics, medicinal chemistry, and natural products derived drug discovery. The review further extends to briefly put forth the updates in the drug testing system, biologics, biophysics, and their advances concerning SARS-CoV-2. The salient features include information on SARS-CoV-2 morphology, genomic characterization, and pathophysiology along with important protein targets and how they influence the drug design and development against SARS-CoV-2 and a concerted and integrated approach to target these stages. The review also gives the status of drug design and discovery to identify the drugs acting on critical targets in SARS-CoV-2 and host reactions to treat Covid-19. � 2020 Elsevier Ltd
Fabrication of activated carbon electrodes derived from peanut shell for high-performance supercapacitors
(Springer Science and Business Media Deutschland GmbH, 2021-07-06T00:00:00) Pandey, Lokesh; Sarkar, Subhajit; Arya, Anil; Sharma, A.L.; Panwar, Amrish; Kotnala, R.K.; Gaur, Anurag
In this work, the activated carbon (AC) is derived from the waste material of peanut shells. The obtained activated carbon has been synthesized using the chemical activation process via impregnation with NaOH at various proportions (1:2 and 1:3). The structural, morphological, and electrochemical properties of obtained AC are examined by X-ray diffraction (XRD), BET surface analysis, scanning electron microscopy (SEM), and electrochemical techniques. The resulting AC shows the enhancement in specific surface area (SSA) from 584 to 735 m2/g at 1:2 ratio and 826 m2/g at 1:3 ratio after the activation process. The electrodes are fabricated using derived activated carbon for electrochemical characterization. It has been observed through cyclic voltammetry and galvanostatic charge�discharge measurements that 1:3 NaOH-activated samples reveal the maximum value of specific capacitance (263 F/g at 10�mV/s and 290 F/gat 0.2A/g). The sample also conveys the pre-dominant ~ 98% of efficiency from 400 to 1000th cycle with fast and almost constant capacitance. The electrochemical impedance spectroscopy (EIS) result suggests the pure capacitive nature of the sample and indicates the dominating electric double-layer capacitive (EDLC) behavior. The obtained results demonstrate that the peanut shell�derived activated carbon is a potential candidate as an electrode material for supercapacitors. Graphical abstract: [Figure not available: see fulltext.] � 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
Fabrication of energy storage EDLC device based on self-synthesized TiO2 nanowire dispersed polymer nanocomposite films
(Springer Science and Business Media Deutschland GmbH, 2021-05-24T00:00:00) Devi, Chandni; Swaroop, Ram; Arya, Anil; Tanwar, Shweta; Sharma, A.L.; Kumar, Sandeep
In this work, a systematic study of titanium oxide (TiO2) nanowires incorporated polymer nanocomposite (PNC) films prepared by a standard solution cast technique is reported. The structural, morphological, dielectric, and electrochemical properties were investigated thoroughly. The polymer nanocomposite films demonstrated improved electrical and electrochemical properties as compared to polymer�salt complex film. The morphological and structural properties have been examined by the field emission scanning electron microscope, Fourier transform infrared spectroscopy, and X-ray diffraction. It is observed that the maximum ionic conductivity is of the order of 10�5 S cm?1 exhibited by 0.5 wt% nanowire added polymer nanocomposite film. The ion transference number was close to unity for optimized film and stability window of about ~ 5�V. The shift of loss tangent peak toward the high-frequency window with nanowire addition indicates a decrease of the relaxation time. The optimized TiO2 nanowire dispersed polymer nanocomposite film has been used to fabricate the electric double-layer capacitor cells. The fabricated cell demonstrates the specific capacitance of about 57.5 F/g (at 10�mV/s). The calculated energy density and power density are 1.38 Wh kg?1 and 0.709�kW�kg?1, respectively. The Coulombic efficiency is 97.7% up to the 500 cycles for the fabricated cell. The prepared polymer nanocomposite has the potential to use it as electrolyte cum separator for solid-state electric double-layer capacitor applications. � 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
Fundamentals of Batteries and Supercapacitors: An Overview
(CRC Press, 2021-09-06T00:00:00) Arya, Anil; Gaur, Anurag; Sharma, A.L.; Kumar, Vijay
Energy plays an important role in daily human life and is the basic need in the present scenario. Nowadays, the development of energy sources is linked with the development of human civilization. The high energy density and high power density energy devices are on the radar of the research community. Batteries and supercapacitors (SCs) are two potential energy storage devices dominating the energy sector all over the world. This chapter starts with a focus on energy technologies and storage needs. Then, fundamentals of electrochemistry have been discussed followed by the working principle of battery and SC, and how energy is stored. Different types of batteries and SCs are discussed with their charge storage mechanisms. At last, important performance parameter and their influence on the overall device and its performance is presented. � 2022 Taylor & Francis Group, LLC.
High efficient carbon coated TiO2electrode for ultra-capacitor applications
(IOP Publishing Ltd, 2021-10-08T00:00:00) Tanwar, Shweta; Arya, Anil; Singh, Nirbhay; Yadav, Bal Chandra; Kumar, Vijay; Rai, Atma; Sharma, A.L.
The present paper reports the investigation of structural, optical, chemical bonding, and electrical properties of the carbon black (CB)/TiO2 composite synthesized via the standard sol-gel method. The structural and morphological properties have been investigated using x-ray diffraction and also field emission scanning electron microscopy to confirm the formation of the nanocomposite. The electrochemical performance of the two-electrode symmetric fabricated supercapacitor (SC) has been examined by complex impedance spectroscopy, cyclic voltammetry, and galvanostatic charge-discharge (GCD). The electrode CT15 (15% TiO2 in CB matrix) shows a high specific capacitance of 236 F g-1 at scan rate 10 mV s-1. The GCD illustrates good specific capacitance retention of 90.3% after 10 000 cycles and with energy density and power density values as 22 Wh kg-1 and 625 kW kg-1 respectively (at 1 A g-1) in the voltage window of 1.2 V. The CT15 electrode cell demonstrates superior electrochemical performance as compared to other electrodes. Electrochemical impedance spectroscopy (EIS) demonstrates the capacitive behaviour of the composite electrode with a low value of resistance. The SC cell having optimum performance has been chosen to demonstrate the glowing red light emitting diode. A mechanism has also been proposed based on received data parameters to validate the SC performance. � 2021 IOP Publishing Ltd.
High-performance supercapacitor based on MoS2@TiO2 composite for wide range temperature application
(Elsevier Ltd, 2021-06-07T00:00:00) Iqbal, Muzahir; Saykar, Nilesh G.; Arya, Anil; Banerjee, Indrani; Alegaonkar, Prashant S.; Mahapatra, S.K.
Transition metal sulphide and their composites gain attention as electrode material in energy storage devices due to their superior properties like excellent conductivity, high surface area, and porosity. We report an evaluation of the electrochemical performance of MoS2@TiO2 binary composite in symmetric supercapacitor assembly at different temperatures. A facile hydrothermal technique is used to prepare MoS2@TiO2 binary composite. Structural and morphological analysis reveals that highly crystalline composite comprising MoS2 assembled in flower-like flake configuration, whereas, TiO2 in nanorods form are prepared. Among all three electrodes, MoS2@15%TiO2 demonstrates maximum specific capacitance 210 F/g at 10 mV/s with excellent cycling stability (98%, 2000 cycles) at ambient temperature. It may be concluded that the mono-phased, mesoporous structure is a key feature behind the improved performance over the other electrodes. Further, improvement in charge-discharge characteristics has been observed by a factor of 200% at 60 �C attributing to low activation energy and faster ion dynamics at elevated temperatures. The impedance spectroscopic analysis reveals a significant reduction in interfacial impedances that leads to a superior capacitance effect compounded with favourable electrolytic charge dynamics. The highest energy density is reported to be 21 Wh/kg with a power density of 1300 W/kg in symmetric configuration. Synergistic effect of the binary system along with unique surface morphology and charge storage followed by intercalation and capacitive mechanism results in enhanced performance of supercapacitor with MoS2@15%TiO2. Thus, binary MoS2@TiO2 composite seems to be an exceptional candidate for the energy storage device operating at a wide temperature range (25�60 �C). � 2021 Elsevier B.V.
Impact of Shape (Nanofiller vs. Nanorod) of TiO2 nanoparticle on Free Standing Solid Polymeric Separator for Energy Storage/Conversion Devices
(Wiley, 2018) Arya, Anil; Saykar, Nilesh G; Sharma, Achchhe Lal
We report the investigation on examining the impact of nanofiller (NF)- versus nanorod (NR)-shaped titanium oxide(TiO2) nanoparticle on the structural, electrochemical, transport, thermal, and dielectric properties of the solid polymer electrolyte(SPE). Thin SPEfilms comprising of poly(ethylene oxide), sodium hexafluorophosphate, and dispersed with TiO2NF, TiO2NR (synthe-sized by hydrothermal route) has been prepared via solution cast technique. The shape of nanoparticle influences the morphologicaland structural properties as observed infield emission scanning electron microscope and X-ray diffraction analysis. The highest ionicconductivity was exhibited by the NR dispersed system and is higher than NF dispersed system for all recorded concentration consis-tently. It is attributed to the formation of the long-range conductive path with NR when compared with NF. In addition, the electro-chemical stability window is much higher (~5 V) than the NF-doped system. Furthermore, the dielectric properties of SPE wereinvestigated andfitted in the complete frequency window (1 Hz–1 MHz;T=40–100 C@10 C). It is observed that the NR dispersedsystem shows higher dielectric strength and low relaxation time with respect to NF dispersed system. The results suggest that the NRdispersed SPE possess enhanced properties and is more appropriate for an application in high energy density solid-state Na ion batte-ries.