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Yang S, Guo X, Li X, Wu T, Zou L, He Z, Xu Q, Zheng J, Chen L, Wang Q, Xu ZJ. Enhancing Photocatalytic CO 2 Conversion through Oxygen-Vacancy-Mediated Topological Phase Transition. Angew Chem Int Ed Engl 2024; 63:e202317957. [PMID: 38270335 DOI: 10.1002/anie.202317957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/05/2024] [Accepted: 01/23/2024] [Indexed: 01/26/2024]
Abstract
Weak adsorption of gas reactants and strong binding of intermediates present a significant challenge for most transition metal oxides, particularly in the realm of CO2 photoreduction. Herein, we demonstrate that the adsorption can be fine-tuned by phase engineering of oxide catalysts. An oxygen vacancy mediated topological phase transition in Ni-Co oxide nanowires, supported on a hierarchical graphene aerogel (GA), is observed from a spinel phase to a rock-salt phase. Such in situ phase transition empowers the Ni-Co oxide catalyst with a strong internal electric field and the attainment of abundant oxygen vacancies. Among a series of catalysts, the in situ transformed spinel/rock-salt heterojunction supported on GA stands out for an exceptional photocatalytic CO2 reduction activity and selectivity, yielding an impressive CO production rate of 12.5 mmol g-1 h-1 and high selectivity of 96.5 %. This remarkable performance is a result of the robust interfacial coupling between two topological phases that optimizes the electronic structures through directional charge transfer across interfaces. The phase transition process induces more Co2+ in octahedral site, which can effectively enhance the Co-O covalency. This synergistic effect balances the surface activation of CO2 molecules and desorption of reaction intermediates, thereby lowering the energetic barrier of the rate-limiting step.
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Affiliation(s)
- Sudong Yang
- School of Chemistry and Chemical Engineering, Chengdu University, Chengdu, 610106, P. R. China
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, P. R. China
| | - Xu Guo
- School of Mechanical Engineering, Chengdu University, Chengdu, 610106, P. R. China
| | - Xiaoning Li
- School of Material Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Tianze Wu
- School of Material Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Longhua Zou
- School of Chemistry and Chemical Engineering, Chengdu University, Chengdu, 610106, P. R. China
| | - Zhiying He
- School of Chemistry and Chemical Engineering, Chengdu University, Chengdu, 610106, P. R. China
| | - Qing Xu
- School of Chemistry and Chemical Engineering, Chengdu University, Chengdu, 610106, P. R. China
| | - Junjie Zheng
- School of Mechanical Engineering, Chengdu University, Chengdu, 610106, P. R. China
| | - Lin Chen
- School of Chemistry and Chemical Engineering, Chengdu University, Chengdu, 610106, P. R. China
| | - Qingyuan Wang
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, P. R. China
- School of Mechanical Engineering, Chengdu University, Chengdu, 610106, P. R. China
| | - Zhichuan J Xu
- School of Material Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
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