Heterostructured CoP/MoO_2 as high efficient electrocatalysts for hydrogen evolution reaction over all pH values

摘要

Delicate design and rapid development of low-cost, highly active, and perdurable pH-universal heterogenveous hydrogen evolution reaction (HER) electrocatalysts are demanding challenge in energy-conversion technologies. Herein, heterostructured CoP/MoO2 electrocatalyst was synthesized by employing MoO2 nanorods as framework for the growth of CoP nanoparticles. Owing to the fact that the effective interface of heterostructure can enhance electron transfer/mass diffusion and expose ample active sites, the CoP/MoO2 reveals eminent HER activities with favorable long-term stability in all pH electrolytes, overpotentials of 69, 78, and 165 mV in 0.5 M H2SO4, 1.0 M KOH, and 1.0 M PBS (phosphate-buffered solution) electrolytes were required for CoP/MoO2 to reach the current density of 10 mA cm(-2). This work emphasizes that strategy of electronic structure engineering holds great promises in pH-universal HER electrocatalysts for energy storage and conversion. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.