Coral reef structured cobalt-doped vanadate oxometalate nanoparticle for a high-performance electrocatalyst in water splitting

Facing the energy crisis in the whole world, it is important to decompose water to obtain high-clean hydrogen energy. However, water splitting by electrocatalysis is suffering from high voltage and poor stability. Herein, we synthesize Co(3)V(2)O(8 )coral reef-like nanoparticles in a facile way, showing a low oxygen evolution reaction (OER) overpotential of 318 mV coupled with good stability, which is superior to commercial RuO2. Besides, the Co(3)V(2)O(8 )shows fast kinetics for hydrogen evolution reaction (HER) and small impedance. Further-more, the Co(3)V(2)O(8 )nanoparticles are assembled in symmetric two-electrode system, which has a very low overall water splitting voltage of 1.50 V at 10 mA cm(-2), this value surpasses the benchmark RuO2//Pt/C assembling and most of the other oxometalate-based electrocatalysts. This work provides a novel and facile way of preparing oxometalates nanomaterial electrocatalyst for hydrogen energy. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

Water splitting for high-clean hydrogen energy is crucial. Coral reef-like Co(3)V(2)O(8 )nanoparticles exhibit low oxygen evolution reaction overpotential, good stability, fast kinetics for hydrogen evolution reaction, and small impedance. This novel nanomaterial electrocatalyst shows superior performance in overall water splitting.