Polyoxometalated metal-organic framework superstructure for stable water oxidation

Author:

Yue Kaihang123ORCID,Lu Ruihu4ORCID,Gao Mingbin5ORCID,Song Fei6ORCID,Dai Yao1,Xia Chenfeng2,Mei Bingbao6ORCID,Dong Hongliang7ORCID,Qi Ruijuan8ORCID,Zhang Daliang9ORCID,Zhang Jiangwei10ORCID,Wang Ziyun4ORCID,Huang Fuqiang11ORCID,Xia Bao Yu212ORCID,Yan Ya13ORCID

Affiliation:

1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China.

2. School of Chemistry and Chemical Engineering, State Key Laboratory of Materials Processing and Die & Mould Technology, Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), Wuhan, China.

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

4. School of Chemical Sciences, University of Auckland, Auckland, New Zealand.

5. National Engineering Laboratory for Methanol to Olefins, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.

6. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, China.

7. Center for High Pressure Science and Technology Advanced Research, Shanghai, China.

8. Key Laboratory of Polar Materials and Devices (MOE), Department of Electronics, East China Normal University, Shanghai, China.

9. Multiscale Porous Materials Center, Institute of Advanced Interdisciplinary Studies and School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, China.

10. College of Energy Material and Chemistry; Inner Mongolia Key Laboratory of Low Carbon Catalysis, Inner Mongolia University, Hohhot, China.

11. State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.

12. Center for Next-Generation Energy Materials and School of Chemical Engineering, Sungkyunkwan University (SKKU), Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, Republic of Korea.

Abstract

Stable, nonprecious catalysts are vital for large-scale alkaline water electrolysis. Here, we report a grafted superstructure, MOF@POM, formed by self-assembling a metal-organic framework (MOF) with polyoxometalate (POM). In situ electrochemical transformation converts MOF into active metal (oxy)hydroxides to produce a catalyst with a low overpotential of 178 millivolts at 10 milliamperes per square centimeter in alkaline electrolyte. An anion exchange membrane water electrolyzer incorporating this catalyst achieves 3 amperes per square centimeter at 1.78 volts at 80°C and stable operation at 2 amperes per square centimeter for 5140 hours at room temperature. In situ electrochemical spectroscopy and theoretical studies reveal that the synergistic interactions between metal atoms create a fast electron-transfer channel from catalytic iron and cobalt sites, nickel, and tungsten in the polyoxometalate to the electrode, stabilizing the metal sites and preventing dissolution.

Publisher

American Association for the Advancement of Science (AAAS)

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