Bifunctional electro-catalytic performances of CoWO₄ nanocubes for water redox reactions (OER/ORR)

Abstract

In this paper, we report the synthesis of cube shaped nanoparticles of CoWO4 (∼30 nm) by molten salts and their bifunctional electro-catalytic activities in water redox reactions for oxygen evolution and oxygen reduction reactions (OER and ORR).

Molten Salts Derived Copper Tungstate Nanoparticles as Bifunctional Electro‐Catalysts for Electrolysis of Water and Supercapacitor Applications

“…For the electrolysis of water; the working electrodes were prepared by pasting of one drop of slurry on the glassy carbon electrode. The procedure of slurry preparation is given elsewhere . The loaded mass of CWO‐NPs catalysts was ∼0.24 mg/cm 2 on GC electrode (0.07 cm 2 ).…”

“…Pt‐wire and Ag/AgCl electrodes were used as counter and reference electrode, respectively, in water electrolysis reactions. The Nernst equation (E(RHE)=E(Ag/AgCl)+0.059 pH+0.197 V at 25 °C) can be used to convert the potential of Ag/AgCl reference electrode to RHE (reversible hydrogen electrode) . For the supercapacitors; the working electrode was prepared by pasting the slurry on carbon paper (1 mg/cm 2 ) containing the weight fraction of 75: 15: 10 of CWO‐NPs catalysts: carbon black: PVDF.…”

“…The procedure of slurry preparation is given elsewhere. [13] The loaded mass of CWO-NPs catalysts was 0.24 mg/cm 2 on GC electrode (0.07 cm 2 ). Pt-wire and Ag/AgCl electrodes were used as counter and reference electrode, respectively, in water electrolysis reactions.…”

“…Therefore, we have motivated to prepare CuWO 4 nanostructured materials to study their electro‐chemical activities at room temperature. Recently, we have reported various mixed metal oxide nanostructures for photo‐catalysis, electro‐catalysis,, and supercapacitors …”

“…Therefore, we have motivated to prepare CuWO 4 nanostructured materials to study their electro-chemical activities at room temperature. Recently, we have reported various mixed metal oxide nanostructures for photo-catalysis, [12] electro-catalysis, [13,14] and supercapacitors. [15] Herein, we report ecofriendly and low cost molten salts synthesis of cube-shaped CuWO 4 nanoparticles (CWO-NPs) as the promising catalysts for electrolysis of water and supercapacitors.…”