Engineering surface atomic structure of single-crystal cobalt (II) oxide nanorods for superior electrocatalysis

Nature Communications - Tập 7 Số 1
Tao Ling1, Dong-Yang Yan1, Yan Jiao2, Hui Wang3, Yao Zheng2, Xueli Zheng1, Jing Mao1, Xi‐Wen Du1, Zhenpeng Hu4, Mietek Jaroniec5, Shi Zhang Qiao2
1Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Institute of New-Energy, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China
2School of Chemical Engineering, The University of Adelaide, Adelaide, 5005 South Australia, Australia
3Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China
4School of Physics, Nankai University, Tianjin 300071, China
5Department of Chemistry and Biochemistry, Kent State University, Kent, 44242, Ohio, USA

Tóm tắt

AbstractEngineering the surface structure at the atomic level can be used to precisely and effectively manipulate the reactivity and durability of catalysts. Here we report tuning of the atomic structure of one-dimensional single-crystal cobalt (II) oxide (CoO) nanorods by creating oxygen vacancies on pyramidal nanofacets. These CoO nanorods exhibit superior catalytic activity and durability towards oxygen reduction/evolution reactions. The combined experimental studies, microscopic and spectroscopic characterization, and density functional theory calculations reveal that the origins of the electrochemical activity of single-crystal CoO nanorods are in the oxygen vacancies that can be readily created on the oxygen-terminated {111} nanofacets, which favourably affect the electronic structure of CoO, assuring a rapid charge transfer and optimal adsorption energies for intermediates of oxygen reduction/evolution reactions. These results show that the surface atomic structure engineering is important for the fabrication of efficient and durable electrocatalysts.

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