Unraveling Ni-Fe 2D nanostructure with enhanced oxygen evolution via in situ and operando spectroscopies

Young Jin Ko, Man Ho Han, Haesol Kim, Jun Yong Kim, Woong Hee Lee, Jaewook Kim, Joon Young Kwak, Chang Hee Kim, Tae Eon Park, Seung Ho Yu, Wook Seong Lee, Chang Hyuck Choi, Peter Strasser, Hyung Suk Oh

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Ni-Fe-based materials are well known as one of the most active electrocatalysts for the oxygen evolution reaction (OER) in alkaline environments. In this study, we propose a facile and scaling up synthesis route using a surfactant for Ni-Fe 2D nanostructured electrocatalysts. Furthermore, we uncovered the hidden phase transformation mechanism of 2D Ni-Fe layered double hydroxide (LDH) electrocatalysts by combining various in situ and operando analyses. The Ni-Fe LDH underwent a chemically induced phase transformation in an alkaline environment without applied potential. The resulting phase transformation product persisted throughout the entire OER mechanism cycle, such that it played a dominant role in the process. The presence of high-valent Ni and Fe was observed on the surface; hence, the OER selectivity and catalytic turnover frequency were enhanced in the low-overpotential domain. Our study not only uncovers the fundamentals of Ni-Fe LDH but also expands the potential for practical alkaline water splitting.

Original languageEnglish
Pages (from-to)2312-2327
Number of pages16
JournalChem Catalysis
Volume2
Issue number9
DOIs
Publication statusPublished - 2022 Sep 15

Keywords

  • AEM
  • anion exchange membrane electrolyzer
  • in situ and operando analyses
  • Ni-Fe 2D nanostructure
  • OER
  • online ICP-MS
  • oxygen evolution reaction mechanism
  • SDG7: Affordable and clean energy

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Physical and Theoretical Chemistry
  • Organic Chemistry

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