Delafossite CuCrO2 nanoparticles with band gap energy of 3.09 eV and surface area of 235 m2 g−1 were prepared by citrate precursor route showed enhanced catalytic degradation of methylene blue in H2O under the sunlight irradiation.
Fabrication of an efficient, economic and earth‐abundant nanocatalyst for H2 production is the centre of attraction in renewable energy technology, but it is still a massive task. In present work, we report a facile modified hydrothermal route to synthesize hierarchical CuO nanoflowers as a noble metal free, proficient photo and electrocatalyst for hydrogen generation. Electrochemical studies were performed over as‐synthesized CuO nanoflowers in both acidic and alkaline medium to record both HER and OER responses. An enhanced HER activity with an overpotential of 1.02 V at −10 mA/cm2 cathodic current density and OER activity with an onset potential at around 1.01 V, respectively, superior to the art of HER and OER bi‐catalyst. Photocatalytic H2 evolution performance exhibits the significant production of 16 mmol/g−1cat in time interval of 8 hours in the presence of Na2S/Na2SO3 sacrificial agent.
Simple hydrothermal method has been used to synthesize zirconia (ZrO 2 ) nanoparticles in alkaline medium. The powder X-ray diffraction technique (PXRD), electron microscopic studies (SEM and TEM) and BET surface area studies were done to characterize the as-synthesized nanoparticles. The crystalline nature and phase analysis of the ZrO 2 nanoparticles was determined by X-ray diffraction studies which revealed that the as-synthesized powder is pure monoclinic zirconia (m-ZrO 2 ). The particle size was estimated by TEM and HRTEM studies, which comes out to be about 25nm. The surface area of as-prepared ZrO 2 nanoparticles was found to be 186m 2 /g with DA pore radius of 11.9Å by using BET surface area studies. The dielectric constant and dielectric loss of the nanoparticles were found to be 7.5 and 0.0094 for as-synthesized nanoparticles at 500 kHz frequency at room temperature.
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