Journal Article

PUBDB-2024-06932

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Engineering multiple nano-twinned high entropy alloy electrocatalysts toward efficient water electrolysis

Wang, S. ; Yan, H. ; Huo, W. (Corresponding author)Extern* ; Davydok, A.HZG*Hereon* ; Zając, M. ; Stepien, J.Extern* ; Feng, H. ; Xie, Z. ; Shang, J. K. ; Camargo, P. H. C. (Corresponding author) ; Jiang, J. ; Fang, F. (Corresponding author)

2025
Elsevier Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.apcatb.2024.124791  doi:10.3204/PUBDB-2024-06932

Abstract: Inducing defects in high entropy alloys (HEAs) has been recognized as a promising approach for tuning surface energetics and catalytic activities. However, the comprehensive understanding and facile synthetic methods for defect-rich HEAs remain challenging. Herein, we present an interstitial-atom engineering strategy that involves interstitial atom doping to synthesize B-doped FeCoNiCuMoB HEA films containing abundant multiple nano-twin boundaries. The resulting fivefold-twinned FeCoNiCuMoB catalyst exhibits exceptional performance in alkaline hydrogen evolution reaction (HER, 26 mV at −10 mA cm−2) and oxygen evolution reaction (OER, 201 mV at 10 mA cm−2). Notably, the two-electrode electrolyzer composed of the FeCoNiCuMoB film electrodes achieved the 10 mA cm−2 at an ultralow cell voltage (1.48 V) for water electrolysis, simultaneously maintaining long-term durability. Through in-situ Raman spectroscopy, X-ray absorption spectroscopy (XAS), electrochemical analyses, and density functional theory (DFT) calculations, we elucidate that the unique twin boundaries play a crucial role in tailoring surficial electronic structures. Moreover, election-rich B atoms display optimized atomic configurations, synergistically contributing to a thermodynamically favourable HER/OER pathway. This work provides a platform via interstitial-atom engineering for designing exceptional HEA catalysts, integrating planar defects and electronic effects, to enhance the efficiencies in water electrolysis applications.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. NOMATEN - Centre of Excellence in Multifunctional Materials for Industrial and Medical Applications (857470) (857470)

Experiment(s):

1. PETRA Beamline P03 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 20 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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