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Efficient and robust single-layer IrOx cluster electrocatalyst for oxygen evolution reaction
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DOI：10.1016/j.ces.2024.120508.png)
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Abstract
En 中文
It is highly desirable to develop efficient and robust oxygen evolution reaction (OER) electrocatalysts for proton exchange membrane water electrolyzer (PEMWE). In this work, an amorphous single-layer IrOx (ASL-IrOx) cluster electrocatalyst is developed by a facile photolysis-electrooxidation strategy for the acidic OER. Experimental results and theoretical calculations indicate that the flexible coordination environment of the cluster gives rise to high-valence Ir5+ species, optimizing the adsorption energy of *OOH and thus improving the OER's kinetics. As a result, the ASL-IrOx x cluster exhibits a 9.9-fold higher mass activity than does the commercial IrO2 catalyst. When applied in a PEMWE, the ASL-IrOx cluster achieves a current density of 1.0 A cm(-2) at an electrolysis voltage of 1.64 V and exhibits superior stability up to 200 h at 0.5 A cm(-2). This work not only presents a strategy for designing cost-effective catalysts, but also provides crucial insights into the mechanistic understanding of the OER.
Keywords:
Single-layer cluster
Oxygen evolution reaction
High-valence Ir species
Proton exchange membrane water electrolyzer
Journal
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4.3
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2.2W
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5.5W