Volume 62, Issue 38 e202307246
Research Article

Introducing Bidirectional Axial Coordination into BiVO4@Metal Phthalocyanine Core–Shell Photoanodes for Efficient Water Oxidation

Dr. Jin-Bo Pan

Dr. Jin-Bo Pan

College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Ministry of Education of Advanced Engineering Research Center for Catalysis, Hunan University, Changsha, 410082 P. R. China

College of Chemical Engineering and Environment, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, Changping, 102249 P. R. China

These authors contributed equally to this work.

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Bing-Hao Wang

Bing-Hao Wang

College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Ministry of Education of Advanced Engineering Research Center for Catalysis, Hunan University, Changsha, 410082 P. R. China

These authors contributed equally to this work.

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Dr. Sheng Shen

Corresponding Author

Dr. Sheng Shen

College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Ministry of Education of Advanced Engineering Research Center for Catalysis, Hunan University, Changsha, 410082 P. R. China

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Dr. Lang Chen

Dr. Lang Chen

College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Ministry of Education of Advanced Engineering Research Center for Catalysis, Hunan University, Changsha, 410082 P. R. China

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Prof. Dr. Shuang-Feng Yin

Corresponding Author

Prof. Dr. Shuang-Feng Yin

College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Ministry of Education of Advanced Engineering Research Center for Catalysis, Hunan University, Changsha, 410082 P. R. China

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First published: 24 July 2023
Citations: 5

Graphical Abstract

Pyrazine was adopted as axial coordination agent for the first time to construct core–shell BiVO4@metal polyphthalocyanine photoanode. The axial coordination of pyrazine facilitated the carrier transfer across the BiVO4 and metal phthalocyanine interface and endowed ZnCoFe polyphthalocyanine with lower Fe d band center and orbital spin, which improved the OER activity by promoting the *OOH desorption.

Abstract

Core-shell photoanodes have shown great potential for photoelectrochemical (PEC) water oxidation. However, the construction of a high-quality interface between the core and shell, as well as a highly catalytic surface, remains a challenge. Herein, guided by computation, we present a BiVO4 photoanode coated with ZnCoFe polyphthalocyanine using pyrazine as a coordination agent. The bidirectional axial coordination of pyrazine plays a dual role by facilitating intimate interfacial contact between BiVO4 and ZnCoFe polyphthalocyanine, as well as regulating the electron density and spin configuration of metal sites in ZnCoFe phthalocyanine, thereby promoting the potential-limiting step of *OOH desorption. The resulting photoanode displayed a high photocurrent density of 5.7±0.1 mA cm−2 at 1.23 VRHE. This study introduces a new approach for constructing core–shell photoanodes, and uncovers the key role of pyrazine axial coordination in modulating the catalytic activity of metal phthalocyanine.

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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