Browsing by Author "Sharma, Achchhe Lal"

Now showing 1 - 3 of 3

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 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.
Structural and electrical properties of polymer nanocomposite films
(Springer Science and Business Media, LLC, 2017) Bhatt, Chandni; Swaroop, Ram; Sharma, Achchhe Lal
A free standing transparent film of solid state polymer electrolyte based on PEMA/PVC+NaPF6 with different compositions of nano sized TiO2 in weight percent (x = 0, 1, 2, 7, 10, 15, 20) is synthesized by using standard solution cast technique. The homogeneous surface of above polymer composition is examined by FESEM. The microscopic interaction among polymer, salt and nano-ceramic filler has been analyzed by Fourier Transformed Infra-Red (FTIR) 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 conductivity has been recorded of the prepared polymeric separator which is of the order of *1.5 × 10−5 Scm−1 10?5Scm?1 after addition of nano-filler (15 % wt/wt) which support the FTIR results. Electrochemical potential window has been observed of the order of ~6 V by the cyclic voltammetry results. The observed data of the prepared separator are at par with the desirable value for device application. - Springer International Publishing Switzerland - 2017.