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Atomic-scale perturbation of oxygen octahedra via surface ion exchange in perovskite nickelates boosts water oxidation

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  • Jumi Bak

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Hyung Bae

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Sung-Yoon Chung

    (Korea Advanced Institute of Science and Technology (KAIST))

Abstract

A substantial amount of interest has been focused on ABO3-type perovskite oxides over the past decade as oxygen electrocatalysts. Despite many studies on various compositions, the correlation between the structure of the oxygen octahedra and electrocatalytic property has been overlooked, and there accordingly have been a very limited number of attempts regarding control of atomistic structure. Utilizing epitaxial LnNiO3 (Ln = La, Pr, Nd) thin films, here we demonstrate that simple electrochemical exchange of Fe in the surface region with several-unit-cell thickness is notably effective to boost the catalytic activity for the oxygen evolution reaction by different orders of magnitude. Furthermore, we directly establish that strong distortion of oxygen octahedra at the angstrom scale is readily induced during the Fe exchange, and that this structural perturbation permits easier charge transfer. The findings suggest that structural alteration can be an efficient approach to achieve exceptional electrocatalysis in crystalline oxides.

Suggested Citation

  • Jumi Bak & Hyung Bae & Sung-Yoon Chung, 2019. "Atomic-scale perturbation of oxygen octahedra via surface ion exchange in perovskite nickelates boosts water oxidation," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10838-1
    DOI: 10.1038/s41467-019-10838-1
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    Cited by:

    1. Shanlin Li & Ruguang Ma & Jingcong Hu & Zichuang Li & Lijia Liu & Xunlu Wang & Yue Lu & George E. Sterbinsky & Shuhu Liu & Lei Zheng & Jie Liu & Danmin Liu & Jiacheng Wang, 2022. "Coordination environment tuning of nickel sites by oxyanions to optimize methanol electro-oxidation activity," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    2. Chao Yang & Rebecca Pons & Wilfried Sigle & Hongguang Wang & Eva Benckiser & Gennady Logvenov & Bernhard Keimer & Peter A. Aken, 2024. "Direct observation of strong surface reconstruction in partially reduced nickelate films," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    3. Bo-Wen Zhang & Meng-Nan Zhu & Min-Rui Gao & Xiuan Xi & Nanqi Duan & Zhou Chen & Ren-Fei Feng & Hongbo Zeng & Jing-Li Luo, 2022. "Boosting the stability of perovskites with exsolved nanoparticles by B-site supplement mechanism," Nature Communications, Nature, vol. 13(1), pages 1-12, December.

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