Surface enrichment of Ir on the IrRu alloy for efficient and stable water oxidation catalysis in acid

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Junming Zhang
  • Xueli Cao
  • Ya-Fei Jiang
  • Sung-Fu Hung
  • Wei Liu
  • Hong Bin Yang
  • Cong-Qiao Xu
  • Dong-Sheng Li
  • Tianyu Zhang
  • Yujing Li
  • Jun Li

Detail(s)

Original languageEnglish
Pages (from-to)12114-12121
Journal / PublicationChemical Science
Volume13
Issue number41
Online published22 Sept 2022
Publication statusPublished - 7 Nov 2022
Externally publishedYes

Link(s)

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. © 2022 The Royal Society of Chemistry.

Research Area(s)

Citation Format(s)

Surface enrichment of Ir on the IrRu alloy for efficient and stable water oxidation catalysis in acid. / Zhang, Junming; Cao, Xueli; Jiang, Ya-Fei et al.
In: Chemical Science, Vol. 13, No. 41, 07.11.2022, p. 12114-12121.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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