Issue 9, 2024

Self-supported iron-based bimetallic phosphide catalytic electrode for efficient hydrogen evolution reaction at high current density

Abstract

Iron (Fe)-based materials, which are abundant in Earth's crust, can be competent candidates as electrocatalysts for large-scale and sustainable alkaline hydrogen evolution reaction (HER); however, unlocking their huge potential critically relies on the rational integration of their structures and electrode materials. Herein, we report the construction of FeP-based bimetallic electrodes through a facile soaking-phosphorization approach. The hierarchical structure of porous iron foam (IF)-nanosheet arrays (NAs) endows enhanced reaction kinetics under high current densities. Modification with different transition metal cations evidently improves the intrinsic catalytic activity of FeP, among which cobalt-modified FeP (CoFe-P) shows the best performance. The optimized CoFe-P NAs/IF electrode exhibits an outstanding catalytic performance in the HER in alkaline media, with a current density of 10 mA cm−2 at an extremely low overpotential of 40 mV. Additionally, at high current densities of 500 and 1000 mA cm−2, the electrode requires impressively low overpotentials of 151 and 162 mV, respectively. Furthermore, the catalytic performance experiences minimal degradation after a stability test at 500 mA cm−2 for 200 hours, suggesting the exceptional stability of the CoFe-P NAs/IF electrode.

Graphical abstract: Self-supported iron-based bimetallic phosphide catalytic electrode for efficient hydrogen evolution reaction at high current density

Supplementary files

Article information

Article type
Paper
Submitted
04 Oct 2023
Accepted
21 Jan 2024
First published
23 Jan 2024

J. Mater. Chem. A, 2024,12, 5331-5339

Self-supported iron-based bimetallic phosphide catalytic electrode for efficient hydrogen evolution reaction at high current density

Z. Zuo, X. Zhang, O. Peng, L. Shan, S. Xiang, Q. Lian, N. Li, G. Mi, A. Amini and C. Cheng, J. Mater. Chem. A, 2024, 12, 5331 DOI: 10.1039/D3TA06035G

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