Surface modulated Fe doping of β-Ni(OH)2 nanosheets for highly promoted oxygen evolution electrocatalysis

Shuisheng Hu, Yong Li, Daekyu Kim, Mengjie Liu, Lawrence Yoon Suk Lee, Kwok-Yin Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)

Abstract

Active yet low-cost electrocatalysts for water oxidation are crucial for the development of hydrogen energy economy. The Fe doping into Ni(OH) 2 dramatically enhances catalytic activity toward oxygen evolution reaction (OER) but fabricating Ni(OH) 2 of high Fe loading is still challenging. Herein, we report a one-pot strategy to prepare disordered β-Ni(OH) 2 nanosheets with a high Fe doping level (9.9 at%, D-Fe-Ni(OH) 2). By engaging 1,4-phenylenediphosphonic acid (BDPA), Fe xBDPA y precursors are in situ generated in a growth solution containing Fe 3+ ions, which decrease the reaction kinetics of Ni 2+ and Fe 3+ ions at the surface of Ni foam. This prevents the deconstructive hydrolysis by Fe 3+ ions and enables a high Fe-doping in D-Fe-Ni(OH) 2. The as-prepared D-Fe-Ni(OH) 2 affords 10 mA cm −2 at an ultralow OER overpotential of 194 mV in alkaline media. This work offers a promising strategy of engaging organic ligands to achieve high-doping levels for the construction of efficient electrocatalysts. (Figure presented.).

Original languageEnglish
Article numbere12256
Pages (from-to)e12256
Number of pages11
JournalEcoMat
Volume4
Issue number6
Early online date5 Jul 2022
DOIs
Publication statusPublished - Nov 2022

Keywords

  • electrocatalysis
  • high Fe doping
  • in situ Raman spectroscopy
  • nickel–iron hydroxide
  • oxygen evolution reaction

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