Direct evidence of boosted oxygen evolution over perovskite by enhanced lattice oxygen participation

Yangli Pan, Xiaomin Xu, Yijun Zhong, Lei Ge (), Yubo Chen, Jean-Pierre Marcel Veder, Daqin Guan, Ryan O’Hayre, Mengran Li, Guoxiong Wang, Hao Wang, Wei Zhou and Zongping Shao ()
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Yangli Pan: Centre for Future Materials, University of Southern Queensland, Springfield Central
Xiaomin Xu: WA School of Mines: Minerals, Energy and Chemical Engineering (WASM-MECE), Curtin University
Yijun Zhong: WA School of Mines: Minerals, Energy and Chemical Engineering (WASM-MECE), Curtin University
Lei Ge: Centre for Future Materials, University of Southern Queensland, Springfield Central
Yubo Chen: School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue
Jean-Pierre Marcel Veder: John de Laeter Centre, Curtin University
Daqin Guan: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University (NanjingTech)
Ryan O’Hayre: Department of Metallurgical and Materials Engineering, Colorado School of Mines
Mengran Li: School of Chemical Engineering, The University of Queensland
Guoxiong Wang: School of Chemical Engineering, The University of Queensland
Hao Wang: Centre for Future Materials, University of Southern Queensland, Springfield Central
Wei Zhou: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University (NanjingTech)
Zongping Shao: WA School of Mines: Minerals, Energy and Chemical Engineering (WASM-MECE), Curtin University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract The development of oxygen evolution reaction (OER) electrocatalysts remains a major challenge that requires significant advances in both mechanistic understanding and material design. Recent studies show that oxygen from the perovskite oxide lattice could participate in the OER via a lattice oxygen-mediated mechanism, providing possibilities for the development of alternative electrocatalysts that could overcome the scaling relations-induced limitations found in conventional catalysts utilizing the adsorbate evolution mechanism. Here we distinguish the extent to which the participation of lattice oxygen can contribute to the OER through the rational design of a model system of silicon-incorporated strontium cobaltite perovskite electrocatalysts with similar surface transition metal properties yet different oxygen diffusion rates. The as-derived silicon-incorporated perovskite exhibits a 12.8-fold increase in oxygen diffusivity, which matches well with the 10-fold improvement of intrinsic OER activity, suggesting that the observed activity increase is dominantly a result of the enhanced lattice oxygen participation.

Date: 2020
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DOI: 10.1038/s41467-020-15873-x

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