Journal of Colloid and Interface Science, Vol.535, 75-83, 2019
Datura-like Ni-HG-rGO as highly efficient electrocatalyst for hydrogen evolution reaction in alkaline conditions
Development of highly-active and noble-metal-free electrocatalysts for hydrogen evolution reactions is a challenge, and optimizing the structure and the composition of the relative materials is critical to obtain the high-quality catalysts. Ni-based compounds are being explored as noble-metal-free electrocatalysts in hydrogen evolution reactions but the Ni-based needs to be modified effectively. In this work, we co-electrodeposited Ni nanoparticles, hydrophilic graphene and graphene oxide layers on Ni foam to synthesize Ni-HG-rGO/NF catalysts. It was presented a Datura-like shape allowing for high performance with current densities of -10 and -100 mA cm(-2) for HER at overpotentials of -50 and -132 mV, a low Tafel slope of -48 mV dec(-1) and excellent long-term stability in 1.0 M NaOH solution. These results demonstrate that the Ni-HG-rGO/NF electrode can be a competitive electrode materials for HER in alkaline conditions. (C) 2018 Elsevier Inc. All rights reserved.
Keywords:Hydrogen evolution reaction;Hydrophilic graphene;Graphene oxide;Ni-HG-rGO;Co-electrodeposition