1
|
Lu M, Du Y, Yan S, Yu T, Zou Z. Thermal suppression of charge disproportionation accelerates interface electron transfer of water electrolysis. Proc Natl Acad Sci U S A 2024; 121:e2316054120. [PMID: 38147548 PMCID: PMC10769854 DOI: 10.1073/pnas.2316054120] [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: 09/16/2023] [Accepted: 11/22/2023] [Indexed: 12/28/2023] Open
Abstract
The sluggish electron transfer kinetics in electrode polarization driven oxygen evolution reaction (OER) result in big energy barriers of water electrolysis. Accelerating the electron transfer at the electrolyte/catalytic layer/catalyst bulk interfaces is an efficient way to improve electricity-to-hydrogen efficiency. Herein, the electron transfer at the Sr3Fe2O7@SrFeOOH bulk/catalytic layer interface is accelerated by heating to eliminate charge disproportionation from Fe4+ to Fe3+ and Fe5+ in Sr3Fe2O7, a physical effect to thermally stabilize high-spin Fe4+ (t2g3eg1), providing available orbitals as electron transfer channels without pairing energy. As a result of thermal-induced changes in electronic states via thermal comproportionation, a sudden increase in OER performances was achieved as heating to completely suppress charge disproportionation, breaking a linear Arrhenius relationship. The strategy of regulating electronic states by thermal field opens a broad avenue to overcome the electron transfer barriers in water splitting.
Collapse
Affiliation(s)
- Mengfei Lu
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, Jiangsu210093, People’s Republic of China
- Eco-materials and Renewable Energy Research Center, College of Engineering and Applied Sciences, Nanjing University, Nanjing, Jiangsu210093, People’s Republic of China
| | - Yu Du
- Eco-materials and Renewable Energy Research Center, College of Engineering and Applied Sciences, Nanjing University, Nanjing, Jiangsu210093, People’s Republic of China
| | - Shicheng Yan
- Eco-materials and Renewable Energy Research Center, College of Engineering and Applied Sciences, Nanjing University, Nanjing, Jiangsu210093, People’s Republic of China
| | - Tao Yu
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, Jiangsu210093, People’s Republic of China
- Jiangsu Key Laboratory for Nano Technology, School of Physics, Nanjing University, Nanjing, Jiangsu210093, People’s Republic of China
| | - Zhigang Zou
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, Jiangsu210093, People’s Republic of China
- Eco-materials and Renewable Energy Research Center, College of Engineering and Applied Sciences, Nanjing University, Nanjing, Jiangsu210093, People’s Republic of China
- Jiangsu Key Laboratory for Nano Technology, School of Physics, Nanjing University, Nanjing, Jiangsu210093, People’s Republic of China
| |
Collapse
|