CoMoO3 Nanoplate/Reduced Graphene Oxide Composites Decorated with Ag Nanoparticles for Electrocatalytic Water Oxidation

Electrochemical water decomposition is a clean energy-conversion method to convert electric energy into high-purity H2, wherein the sluggish kinetic process of oxygen evolution reaction (OER) extremely restricts the reaction kinetics of water decomposition. Focusing on this problem, we develop a flowery CoMoO3 nanoplate/reduced graphene oxide (rGO) nanoplate hybrid structure decorated with Ag nanoparticles (CoMoO3/rGO@Ag) to ameliorate the catalytic performance of OER. The reduced graphene oxide (rGO) wrapped outside can optimize electronic transmission and retain the structural integrity of internal flowery CoMoO3 nanoplates. Moreover, abundant ultrafine Ag nanoparticles are chosen as the auxiliary phase to cooperate with CoMoO3 and rGO phases, and such hybrid structure generates abundant heterostructure interfaces, which can offer more active sites and significantly enhance the reaction activity of the catalyst. After the incorporation of rGO and the adjustment of the Ag content, the optimized CoMoO3/rGO@Ag catalyst displays electrochemically synergistic enhancement toward OER, which shows a remarkably low overpotential (209 mV at 10 mA cm–2) and good cyclic endurance. These results effectively expound the rapid reaction kinetics and great stability of such heterostructure electrocatalyst toward water oxidation.