Dealloying-Induced Zeolite-like Metal Framework of AB2 Laves Phase Intermetallic Electrocatalysts

Shen-Jing Ji; Li-Wen Cao; Peng Zhang; Guan-Bo Wang; Ying-Rui Lu; Nian-Tzu Suen; Sung-Fu Hung; Hao Ming Chen

doi:10.1021/jacs.3c05287

Dealloying-Induced Zeolite-like Metal Framework of AB₂ Laves Phase Intermetallic Electrocatalysts

J Am Chem Soc. 2023 Aug 16;145(32):17892-17901. doi: 10.1021/jacs.3c05287. Epub 2023 Jul 23.

Authors

Shen-Jing Ji¹, Li-Wen Cao¹, Peng Zhang¹, Guan-Bo Wang², Ying-Rui Lu³, Nian-Tzu Suen¹, Sung-Fu Hung⁴, Hao Ming Chen^{2

3

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Affiliations

¹ College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
² Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
³ National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan.
⁴ Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan.
⁵ Graduate Institute of Nanomedicine and Medical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan.

PMID: 37482661
DOI: 10.1021/jacs.3c05287

Abstract

Exploring an efficient and robust electrocatalyst for hydrogen evolution reaction (HER) at high pH and temperature holds the key to the industrial application of alkaline water electrolysis (AWE). Herein, we design an open tunnel structure by dealloying a series of Laves phase intermetallics, i.e., MCo₂ and MRu_0.25Co_1.75 (M = Sc and Zr). The dealloying process can induce a zeolite-like metal framework for ScCo₂ and ScRu_0.25Co_1.75 by stripping Sc metal from the center of a tunnel structure. This structural engineering significantly lowers their overpotentials at a current density of 500 mA/cm² (η₅₀₀) ca. 80 mV in 1.0 M KOH. Through a simple process, ScRu_0.25Co_1.75 can be easily decorated on a carbon cloth substrate and only requires 132 mV to reach 500 mA/cm². More importantly it can maintain activity over 1000 h in industrial conditions (6.0 M KOH at 333 K), showing its potential for practical industrial applications.