Browsing by Subject "decorated"

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    Graphitic Carbon Nitride Composites with MoO3-Decorated Co3O4Nanorods as Catalysts for Oxygen and Hydrogen Evolution
    (American Chemical Society, 2021-10-22T00:00:00) Ahmed, Imtiaz; Biswas, Rathindranath; Patil, Ranjit A.; Halder, Krishna Kamal; Singh, Harjinder; Banerjee, Biplab; Kumar, Bhupender; Ma, Yuan-Ron; Haldar, Krishna Kanta
    We have prepared a graphitic carbon nitride (g-C3N4) composite with MoO3-decorated Co3O4 nanorods (Co3O4/MoO3/g-C3N4) via the hydrothermal approach, and this hybrid material acts as a highly active and durable electrocatalyst for water splitting reactions. This material could fundamentally influence the catalytic processes and performance of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The OER and HER activities of Co3O4-/MoO3-based nanorods are enhanced by blending with conducting support, for example, graphitic carbon nitrides (g-C3N4). The X-ray diffraction pattern and the attenuated total reflectance-Fourier transform infrared data revealed that the as-synthesized nanorods are highly crystalline in nature and are attached to the g-C3N4 support. Transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy studies also affirm the successful heterointerface formation between Co3O4/MoO3 nanorods and g-C3N4. This Co3O4/MoO3/g-C3N4 rod-shaped catalyst is highly stable in comparison to its individual constituent and generates a current density of 10 mA cm-2 at a low overpotential of 206 mV for OER and 125 mV for HER in alkaline and acidic media, respectively. This work could pave the way for developing Co3O4/MoO3/g-C3N4 composite materials as electrocatalysts for overall water splitting reactions. � 2021 American Chemical Society. All rights reserved.
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    NiO QDs /ZnO nanorods composite structure for catalytic reduction of Cr6+
    (Central University of Punjab, 2018) Ahmed, Imtiaz; Haldar, K.K
    Infront of the emerging interest and talent to search for new materials, we have synthesized Nickel oxide (NiO) nanoparticles decorated Zinc oxide (ZnO) nanorods composite (NiO/ZnO) nanostructure. By the X-ray powder diffraction and high-resolution transmission electron microscopy (HRTEM) the NiO/ZnO heterostructure formation was confirmed. The fabricated environmental affable NiO/ZnO composite nanostructure under UV-lights shows a well-defined photoreduction characteristic of hexavalent Chromium (Cr) (VI) to tri-valent Chromium (Cr) (III). Photoluminescence (PL) spectroscopy, photocurrent study, and electrochemical impedance spectroscopy, proved that the superior photoreduction property is ascribed due to the decreased electron-hole recombination process. In addition to the photocatalytic activity rate of the NiO decorated ZnO nanorods was much higher than that of exposed ZnO nanorods dfv for the reduction of chromium (VI) and their rate of activity is found to be 0.306 min?1 . All results have demonstrates that in the development of highperformance photocatalyst the suitable surface engineering may open up new opportunities.