Volume 62, Issue 21 e202302575
Research Article

Graphene Mediates Charge Transfer between Lead Chromate and a Cobalt Cubane Cocatalyst for Photocatalytic Water Oxidation

Wenchao Jiang

Wenchao Jiang

School of Chemistry and Materials Science, University of Science and Technology of China, 230026 Hefei, China

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

Contribution: Data curation (lead), Formal analysis (lead), ​Investigation (lead), Writing - original draft (lead), Writing - review & editing (lead)

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Lingcong Zhang

Lingcong Zhang

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

University of Chinese Academy of Sciences, Center of Materials Science and Optoelectronics Engineering, 100049 Beijing, China

Contribution: Formal analysis (supporting)

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Chenwei Ni

Chenwei Ni

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

University of Chinese Academy of Sciences, Center of Materials Science and Optoelectronics Engineering, 100049 Beijing, China

Contribution: Formal analysis (supporting)

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Ming Shi

Ming Shi

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

University of Chinese Academy of Sciences, Center of Materials Science and Optoelectronics Engineering, 100049 Beijing, China

Contribution: Formal analysis (supporting)

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Yue Zhao

Yue Zhao

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

University of Chinese Academy of Sciences, Center of Materials Science and Optoelectronics Engineering, 100049 Beijing, China

Contribution: Formal analysis (supporting)

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Yuting Deng

Yuting Deng

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

University of Chinese Academy of Sciences, Center of Materials Science and Optoelectronics Engineering, 100049 Beijing, China

Contribution: Formal analysis (supporting)

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Haibo Chi

Haibo Chi

School of Chemistry and Materials Science, University of Science and Technology of China, 230026 Hefei, China

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

Contribution: Formal analysis (supporting)

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Ruotian Chen

Ruotian Chen

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

University of Chinese Academy of Sciences, Center of Materials Science and Optoelectronics Engineering, 100049 Beijing, China

Contribution: Formal analysis (supporting)

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Prof. Xiuli Wang

Prof. Xiuli Wang

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

University of Chinese Academy of Sciences, Center of Materials Science and Optoelectronics Engineering, 100049 Beijing, China

Contribution: Formal analysis (supporting)

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Prof. Rengui Li

Corresponding Author

Prof. Rengui Li

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

University of Chinese Academy of Sciences, Center of Materials Science and Optoelectronics Engineering, 100049 Beijing, China

Contribution: Formal analysis (lead), Funding acquisition (lead), ​Investigation (equal), Writing - original draft (lead), Writing - review & editing (lead)

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Prof. Can Li

Corresponding Author

Prof. Can Li

School of Chemistry and Materials Science, University of Science and Technology of China, 230026 Hefei, China

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China

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First published: 23 March 2023
Citations: 6

Graphical Abstract

Partially oxidized graphene (pGO) operates as a charge-transfer mediator between the water oxidation cocatalyst (Co4O4) and the hole-accumulating {−101} facets of PbCrO4. Unimpeded transfer of photogenerated holes from PbCrO4 to Co4O4 via the pGO mediator is demonstrated. The resulting Co4O4/pGO/PbCrO4 photocatalyst oxidizes water with an apparent quantum efficiency exceeding 10 % at 500 nm.

Abstract

The interfacial barrier of charge transfer from semiconductors to cocatalysts means that the photogenerated charges cannot be fully utilized, especially for the challenging water oxidation reaction. Using cobalt cubane molecules (Co4O4) as water oxidation cocatalysts, we rationally assembled partially oxidized graphene (pGO), acting as a charge-transfer mediator, on the hole-accumulating {−101} facets of lead chromate (PbCrO4) crystal. The assembled pGO enables preferable immobilization of Co4O4 molecules on the {−101} facets of the PbCrO4 crystal, which is favorable for the photogenerated holes transferring from PbCrO4 to Co4O4 molecules. The surface charge-transfer efficiency of PbCrO4 was boosted by selective assembly of pGO between PbCrO4 and Co4O4 molecules. An apparent quantum efficiency for photocatalytic water oxidation on the Co4O4/pGO/PbCrO4 photocatalyst exceeded 10 % at 500 nm. This strategy of rationally assembling charge-transfer mediator provides a feasible method for acceleration of charge transfer and utilization in semiconductor photocatalysis.

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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