Volume 63, Issue 32 e202408412
Research Article

pH-Universal Electrocatalytic CO2 Reduction with Ampere-Level Current Density on Doping-Engineered Bismuth Sulfide

Zinan Jiang

Zinan Jiang

Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 Anhui, China

The authors were contributed to this paper equally.

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Shan Ren

Shan Ren

Center for Materials and Interfaces, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen, Guangdong, 518055 China

The authors were contributed to this paper equally.

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Xi Cao

Xi Cao

Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 Anhui, China

The authors were contributed to this paper equally.

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Qikui Fan

Qikui Fan

Ministry of Education Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics, School of Physics, Xi'an Jiaotong University, Xi'an, 710049 China

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Rui Yu

Rui Yu

Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 Anhui, China

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Jian Yang

Corresponding Author

Jian Yang

Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 Anhui, China

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Junjie Mao

Corresponding Author

Junjie Mao

Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 Anhui, China

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First published: 27 May 2024
Citations: 52

Graphical Abstract

The S-doped metallic Bi catalyst was formed by the electrochemical reconstruction of Bi2S3, which delivers outstanding performance in converting CO2 to formate/formic acid across a range of pH conditions. The simultaneous production of formate on both cathode and anode was also achieved by coupling CO2 reduction reaction with glycerol oxidation reaction.

Abstract

The practical application of the electrocatalytic CO2 reduction reaction (CO2RR) to form formic acid fuel is hindered by the limited activation of CO2 molecules and the lack of universal feasibility across different pH levels. Herein, we report a doping-engineered bismuth sulfide pre-catalyst (BiS-1) that S is partially retained after electrochemical reconstruction into metallic Bi for CO2RR to formate/formic acid with ultrahigh performance across a wide pH range. The best BiS-1 maintains a Faraday efficiency (FE) of ~95 % at 2000 mA cm−2 in a flow cell under neutral and alkaline solutions. Furthermore, the BiS-1 catalyst shows unprecedentedly high FE (~95 %) with current densities from 100 to 1300 mA cm−2 under acidic solutions. Notably, the current density can reach 700 mA cm−2 while maintaining a FE of above 90 % in a membrane electrode assembly electrolyzer and operate stably for 150 h at 200 mA cm−2. In situ spectra and density functional theory calculations reveals that the S doping modulates the electronic structure of Bi and effectively promotes the formation of the HCOO* intermediate for formate/formic acid generation. This work develops the efficient and stable electrocatalysts for sustainable formate/formic acid production.

Conflict of interests

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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