Development of cost effective and efficient electrocatalysts is crucial to generate H2 as an alternative source of energy. However, expensive noble metal based electrocatalysts show best electrocatalytic performances which acts as main bottle-neck for commercial application. Therefore, non-precious electrocatalysts have become important for hydrogen and oxygen evolution reactions. Herein, we report the synthesis of high surface area (35 m2/g) sodium niobate nanoparticles by citrate precursor method. These nanoparticles were characterized by different techniques like X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. Electrocatalytic properties of cost-effective sodium niobate nanoparticles were investigated for HER and OER in 0.5 M KOH electrolyte using Ag/AgCl as reference electrode. The sodium niobate electrode showed significant current density for both OER (≈2.7 mA/cm2) and HER (≈0.7 mA/cm2) with onset potential of 0.9 V for OER and 0.6 V for HER. As-prepared sodium niobate nanoparticles show enhanced photocatalytic property (86% removal) towards the degradation of rose Bengal dye. Dielectric behaviour at different sintering temperatures was explained by Koop’s theory and Maxwell-Wagner mechanism. The dielectric constants of 41 and 38.5 and the dielectric losses of 0.04 and 0.025 were observed for the samples sintered at 500 °C and 700 °C, respectively at 500 kHz. Conductivity of the samples was understood by using power law fit.
Population
explosion has caused serious environmental and energy-related
problems that have increased the interest of researchers to develop
new nontoxic, inexpensive, stable, and efficient materials to address
these environment and energy-related issues. Among the different efforts,
the development of photocatalysts is considered as an important way
to utilize the sustainable solar energy for environment remediation
and energy purposes. Presently, several hundred photocatalysts have
been synthesized. Among them, alkali niobates and tantalates represent
an important class of photocatalysts, because of their nontoxicity,
structural flexibility, and simplicity. This review summarizes recent
developments in synthetic strategies of alkali niobate and tantalates,
their important application as photocatalysts for environment remediation
and energy applications, and efforts being made to modify their physicochemical
properties and extend their efficiencies by tuning different reaction
conditions. The purpose of this Review is to discuss methods to regulate
the efficiencies of these materials and future challenges faced for
practical applications.
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.
Iron oxide nanoparticles (IONPs) were preparedviaa co-precipitation method and were then characterized and evaluated for their antibacterial activity after modification withOcimum sanctumleaf extract.
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