Nonprecious bimetallic NiFe-layered hydroxide nanosheets as a catalyst for highly efficient electrochemical water splitting

Akbar I. Inamdar, Harish S. Chavan, Yongcheol Jo, Hyunsik Im, Hyungsang Kim

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

It has become highly necessary to advance stable, cost-effective, and energy-efficient hydrogen production using non-precious metal-based water electrolysis to replace the increasing demand for fossil fuels and maintain environmental safety. Herein, we present the synthesis of non-precious bimetallic Ni1-xFex-layered hydroxide nanosheet films by using a chemical-bath deposition technique for use as oxygen evolution reaction (OER) catalysts for electrochemical water electrolysis. Remarkably, the optimized Ni0.50Fe0.50-layered hydroxide electrode exhibited excellent OER activity in 1 M potassium hydroxide electrolyte while having a low overpotential of 239.7 mV at a current density of 10 mA cm−2 with a small Tafel slope of 38.02 mV dec−1. It was electrochemically stable over 100 hours of continuous OER operation, thereby showing its excellent electrochemical stability. The results from a post-OER study reveal that catalytically active OER sites are associated with the formation of a nickel oxyhydroxide intermediate on the surface of the electrode. The maximum synergy among good electronic conductivity, high diffusion coefficient, and enlarged electrochemically active sites was obtained by optimizing the Ni/Fe ratio and thereby, the OER activity.

Original languageEnglish
Pages (from-to)16963-16972
Number of pages10
JournalInternational Journal of Energy Research
Volume45
Issue number11
DOIs
StatePublished - Sep 2021

Keywords

  • electrocatalysis
  • NiFe layered hydroxide
  • oxygen evolution reaction
  • water splitting

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