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Research Article

Stabilizing high-efficiency iridium single atoms via lattice confinement for acidic oxygen evolution

Yibo Wang1,2,4,§, Jiadong Jiang5,§, Zhaoping Shi1,2,4, Hongxiang Wu1,2,4, Jiahao Yang1,2,4, Pengbo Wang1,2,4, Shuai Hou1, Meiling Xiao1,2,3,4, Junjie Ge1,2( ), Changpeng Liu1,2,4( ), Wei Xing1,2,3,4( )
Laboratory of Advanced Power Sources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, . China
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Jilin Province Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun 130012, China

§ Yibo Wang and Jiadong Jiang contributed equally to this work.

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Graphical Abstract

A lattice-confined strategy was reported to stabilize Ir single atom. The synthesized IrSAs-PdO exhibited superior activity and stability in a practical water electrolyzer even though the loading of Ir was as low as 60 µg·cm−2.

Abstract

Stable and efficient single atom catalysts (SACs) are highly desirable yet challenging in catalyzing acidic oxygen evolution reaction (OER). Herein, we report a novel iridium single atom catalyst structure, with atomic Ir doped in tetragonal PdO matrix (IrSAs-PdO) via a lattice-confined strategy. The optimized IrSAs-PdO-0.10 exhibited remarkable OER activity with an overpotential of 277 mV at 10 mA·cm−2 and long-term stability of 1000 h in 0.5 M H2SO4. Furthermore, the turnover frequency attains 1.6 s−1 at an overpotential of 300 mV with a 24-fold increase in the intrinsic activity. The high activity originates from isolated iridium sites with low valence states and decreased Ir–O bonding covalency, and the excellent stability is a result of the effective confinement of iridium sites by Ir–O–Pd motifs. Moreover, we demonstrated for the first time that SACs have great potential in realizing ultralow loading of iridium (as low as microgram per square center meter level) in a practical water electrolyzer.

Keywords

proton exchange membrane water electrolysislattice confinementiridium single atomsultralow iridium loadingacidic oxygen evolution

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Nano Research
Volume 17 Issue 4,
April 2024
Pages 2492-2498
DOI: 10.1007/s12274-023-6177-x
Cite this article:
Wang Y, Jiang J, Shi Z, et al. Stabilizing high-efficiency iridium single atoms via lattice confinement for acidic oxygen evolution. Nano Research, 2024, 17(4): 2492-2498. https://doi.org/10.1007/s12274-023-6177-x
Topics:
Electrocatalysis Oxygen evolution reaction

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Received: 11 July 2023
Revised: 29 August 2023
Accepted: 10 September 2023
Published: 02 December 2023
© Tsinghua University Press 2023
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