Volume 17, Issue 51 2102970
Research Article

Elucidating the Strain–Vacancy–Activity Relationship on Structurally Deformed Co@CoO Nanosheets for Aqueous Phase Reforming of Formaldehyde

Kaicheng Qian

Kaicheng Qian

National Engineering Lab for Textile Fiber Materials and Processing Technology, Zhejiang Sci-Tech University, Hangzhou, 310018 China

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Yong Yan

Yong Yan

School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459 Singapore

Cambridge Centre for Advanced Research and Education, 1 CREATE Way, Singapore, 138602 Singapore

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Shibo Xi

Shibo Xi

Institute of Chemical and Engineering Science Limited, Agency for Science Technology and Research (A*STAR), 1 Pesek Road, Singapore, 627833 Singapore

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Tong Wei

Tong Wei

National Engineering Lab for Textile Fiber Materials and Processing Technology, Zhejiang Sci-Tech University, Hangzhou, 310018 China

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Yihu Dai

Yihu Dai

Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816 China

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Xiaoqing Yan

Xiaoqing Yan

National Engineering Lab for Textile Fiber Materials and Processing Technology, Zhejiang Sci-Tech University, Hangzhou, 310018 China

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Hisayoshi Kobayashi

Hisayoshi Kobayashi

Emeritus Professor of Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, 606-8585 Japan

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Sheng Wang

Sheng Wang

National Engineering Lab for Textile Fiber Materials and Processing Technology, Zhejiang Sci-Tech University, Hangzhou, 310018 China

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Wen Liu

Corresponding Author

Wen Liu

School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459 Singapore

Cambridge Centre for Advanced Research and Education, 1 CREATE Way, Singapore, 138602 Singapore

E-mail: [email protected], [email protected]

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Renhong Li

Corresponding Author

Renhong Li

National Engineering Lab for Textile Fiber Materials and Processing Technology, Zhejiang Sci-Tech University, Hangzhou, 310018 China

E-mail: [email protected], [email protected]

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First published: 11 October 2021
Citations: 24

Abstract

Lattice strain modulation and vacancy engineering are both effective approaches to control the catalytic properties of heterogeneous catalysts. Here, Co@CoO heterointerface catalysts are prepared via the controlled reduction of CoO nanosheets. The experimental quantifications of lattice strain and oxygen vacancy concentration on CoO, as well as the charge transfer across the Co–CoO interface are all linearly correlated to the catalytic activity toward the aqueous phase reforming of formaldehyde to produce hydrogen. Mechanistic investigations by spectroscopic measurements and density functional theory calculations elucidate the bifunctional nature of the oxygen-vacancy-rich Co–CoO interfaces, where the Co and the CoO sites are responsible for CH bond cleavage and OH activation, respectively. Optimal catalytic activity is achieved by the sample reduced at 350 °C, Co@CoO-350 which exhibits the maximum concentration of Co–CoO interfaces, the maximum concentration of oxygen vacancies, a lattice strain of 5.2% in CoO, and the highest aqueous phase formaldehyde reforming turnover frequency of 50.4 h−1 at room temperature. This work provides not only new insights into the strain–vacancy–activity relationship at bifunctional catalytic interfaces, but also a facile synthetic approach to prepare heterostructures with highly tunable catalytic activities.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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