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Title: Surface enrichment of Ir on the IrRu alloy for efficient and stable water oxidation catalysis in acid
Authors: Zhang, Junming
Cao, Xueli
Jiang, Ya-Fei
Hung, Sung-Fu
Liu, Wei
Yang, Hong Bin
Xu, Cong-Qiao
Li, Dong-Sheng
Zhang, Tianyu
Li, Yujing
Li, Jun
Liu, Bin
Keywords: Engineering::Chemical engineering
Issue Date: 2022
Source: Zhang, J., Cao, X., Jiang, Y., Hung, S., Liu, W., Yang, H. B., Xu, C., Li, D., Zhang, T., Li, Y., Li, J. & Liu, B. (2022). Surface enrichment of Ir on the IrRu alloy for efficient and stable water oxidation catalysis in acid. Chemical Science, 13(41), 12114-12121.
Project: RG4/20 
Journal: Chemical Science 
Abstract: Inducing the surface enrichment of active noble metal can not only help to stabilize the catalyst but also modify the catalytic performance of the catalyst through electronic and geometric effects. Herein, we report the in situ surface enrichment of Ir on IrRu alloy during the oxygen evolution reaction (OER). The surface enrichment of Ir was probed by ex situ high-resolution transmission electron microscopy (HRTEM), in situ X-ray absorption spectroscopy (XAS), and electrochemical Cu stripping, leading to complementary characterizations of the dynamic reconstruction of the IrRu alloy during OER. Guided by the density functional theory (DFT), an IrRu alloy with low Ir content (20 wt%) was constructed, which displayed a low overpotential of only 230 mV to deliver an OER current density of 10 mA cm-2 in 0.1 M HClO4 solution and maintained stable performance for over 20 h. To investigate the practical application potential, a proton exchange membrane (PEM) water electrolyzer using the IrRu alloy as the anode catalyst was assembled, which required a low cell voltage of only 1.48 V to generate a current density of 1 A cm-2.
ISSN: 2041-6520
DOI: 10.1039/d2sc03947h
Schools: School of Chemical and Biomedical Engineering 
Rights: © 2022 The Author(s). Published by the Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles

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