Soft Template-Based Synthesis of Mesoporous Phosphorus- and Boron-Codoped NiFe-Based Alloys for Efficient Oxygen Evolution Reaction

Yunqing Kang, Yanna Guo, Jingjing Zhao, Bo Jiang, Jingru Guo, Yi Tang, Hexing Li, Victor Malgras, Mohammed A. Amin, Hiroki Nara, Yoshiyuki Sugahara, Yusuke Yamauchi, Toru Asahi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Controlling the morphology, composition, and crystalline phase of mesoporous nonnoble metal catalysts is essential for improving their performance. Herein, well-defined P- and B-codoped NiFe alloy mesoporous nanospheres (NiFeB-P MNs) with an adjustable Ni/Fe ratio and large mesopores (11 nm) are synthesized via soft-template-based chemical reduction and a subsequent phosphine-vapor-based phosphidation process. Earth-abundant NiFe-based materials are considered promising electrocatalysts for the oxygen evolution reaction (OER) because of their low cost and high intrinsic catalytic activity. The resulting NiFeB-P MNs exhibit a low OER overpotential of 252 mV at 10 mA cm−2, which is significantly smaller than that of B-doped NiFe MNs (274 mV) and commercial RuO2 (269 mV) in alkaline electrolytes. Thus, this work highlights the practicality of designing mesoporous nonnoble metal structures and the importance of incorporating P in metallic-B-based alloys to modify their electronic structure for enhancing their intrinsic activity.

Original languageEnglish
Article number2203411
JournalSmall
Volume18
Issue number33
DOIs
Publication statusPublished - 2022 Aug 18

Keywords

  • mesoporous metals
  • nonmetallic element doping
  • nonnoble metal borides
  • soft-template-based synthesis

ASJC Scopus subject areas

  • Biotechnology
  • Chemistry(all)
  • Biomaterials
  • Materials Science(all)

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