Self-supported cobalt-molybdenum oxide nanosheet clusters as efficient electrocatalysts for hydrogen evolution reaction

摘要

In this paper, we report the three-dimensional self-supported CoMoO4 nanosheet clusters on the nickel foam (denoted as CoMoO4/NF) by a facile hydrothermal-calcination method for efficient hydrogen generation. As a result, the freestanding CoMoO4 electrode exhibits an efficient electrochemical activity towards hydrogen evolution reaction, showing over-potentials as low as 68 and 178 mV at current densities of 10 and 100 mA cm(-2) in the alkaline condition (1 M KOH), respectively, a Tafel slope value of 82 mV per decade. Moreover, the electrode exhibits remarkable electrochemical durability for 1000 cycles. Significantly, the water splitting electrolyzer assembled with CoMoO4/NF parallel to NiFe LDH/NF (the nickel iron layered double hydroxide supported on the nickel foam) system achieved 20 mA cm(-2) at 1.63 V, showing the CoMoO4/NF is promising for practical water splitting applications. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.