NiFe Hydroxide Supported by Hierarchically Porous Nickel Mesh as High-performance Bifunctional Electrocatalyst for Water Splitting at Large Current Density.

Author(s) Wang, P.C.; Wan, L.; Lin, Y.Q.; Wang, B.
Journal ChemSusChem
Date Published 2019 Jul 16
Abstract

The preparation of efficient and low-cost bifunctional catalysts with superior stability toward water splitting is a topic of significant current interest for hydrogen generation. Herein, a novel and facile strategy was developed to fabricate highly active electrodes with hierarchical porous structures using a two-step electrodeposition method, in which NiFe-layered double hydroxide was in situ grown on a three-dimensional hierarchical Ni mesh (NiFe/Ni/Ni). The as-prepared NiFe/Ni/Ni electrodes demonstrated remarkable structural stability with high surface areas, effective tortuosity for gas transportation and fast electron transfer. Benefiting from the unique structure, the self-supported NiFe/Ni/Ni electrodes exhibited an overpotential of 190 mV and 300 mV for the oxygen evolution reaction (OER) at current densities of 10 and 500 mA cm-2, respectively. Furthermore, the self-supported NiFe/Ni/Ni electrodes also exhibited high hydrogen evolution reaction (HER) performance and possessed ultrastability at a current density of 500 mA cm-2, for both OER and HER. Remarkably, using NiFe/Ni/Ni as both the cathode and anode for alkaline water electrolysis, a current density of 500 mA cm-2 was achieved at a cell voltage of 1.96 V. Additionally, the water electrolyzer exhibited superior stability even at a large current density (500 mA cm-2) when subjected to high temperatures.

DOI 10.1002/cssc.201901439
ISSN 1864-564X
Citation Wang P-, Wan L, Lin Y-, Wang B. NiFe Hydroxide Supported by Hierarchically Porous Nickel Mesh as High-performance Bifunctional Electrocatalyst for Water Splitting at Large Current Density. ChemSusChem. 2019.

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