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

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外文摘要：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 lrSAs-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.

外文关键词：

lattice confinementiridium single atomsultralow iridium loadingacidic oxygen evolutionproton exchange membrane water electrolysis

作者：

Yibo Wang、Jiadong Jiang、Zhaoping Shi、Hongxiang Wu、Jiahao Yang、Pengbo Wang、Shuai Hou、Meiling Xiao、Junjie Ge、Changpeng Liu、Wei Xing

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作者单位：

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

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

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,Ch

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基金：

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaStrategic priority research program of CASJilin Province Science and Technology Development ProgramJilin Province Science and Technology Development ProgramJilin Province Development and Reform Commission Program

项目编号：

2022YFB400200022232004XDA2109040020210301008GX20210502002ZP2023C032-6

出版年：

2024

DOI：

10.1007/s12274-023-6177-x

纳米研究(英文版)

CSTPCD

ISSN：

年,卷(期)：2024.17(4)

参考文献量35