Abstract
In this work, h-WO3/CuWO4 (hexagonal WO3/CuWO4) core-shell microsphere and single crystalline CuWO4 nanoparticles were synthesized by two step process using polyol assisted hydrothermal-hybrid microwave annealing (HMA) process. In the sake of comparison, conventional annealing (CA) process showed CuWO4/m-WO3 (CuWO4/monoclinic WO3) and CuWO4/CuO microrods by in-situ annealing of as-prepared particles obtained under pH 3 and 9 respectively. The h-WO3/CuWO4 microsphere showed onset potential of 350 mV, and three fold times small and cathodic overpotential (ηc) of 20 mV for current density (j) = −3 mA/cm2 compared to CuWO4/m-WO3 in hydrogen evolution reaction (1 M H2SO4). For oxygen evolution reaction in 0.1 M KOH electrolyte, single crystalline CuWO4 showed a small onset potential of 350 mV and anodic overpotential (ηa) of 1.0 V for the j = 10 mA/cm2 compared to CA treated CuWO4.
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