期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-26281-0
关键词
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资金
- National Natural Science Foundation of China [21872019]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germanys Excellence Strategy [EXC 2089/1-390776260]
- TUM.Solar in the context of the Bavarian Collaborative Research Project Solar Technologies Go Hybrid (SolTech)
- Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO)
- University of Tokyo Advanced Characterization Nanotechnology Platform in the Nanotechnology Platform Project - Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [PMXP09-A-21-UT-0046]
The study finds that cobalt can promote the self-healing of leached iron centers in borate-intercalated nickel-iron-cobalt oxyhydroxides, leading to the synthesis of an active borate-intercalated NiCoFe-LDH catalyst with self-healing ability under harsh OER conditions. The presence of both ferrous ions and borate ions in the electrolyte is crucial to the catalyst's self-healing, demonstrating its potential for integration into photoelectrochemical devices.
While self-healing catalysts may survive the harsh environments used for oxygen evolution, understanding how to develop such electrocatalysts remains a challenge. Here, authors find cobalt to promote the self-healing of leached iron centers in borate-intercalated nickel-iron-cobalt oxyhydroxides. While self-healing is considered a promising strategy to achieve long-term stability for oxygen evolution reaction (OER) catalysts, this strategy remains a challenge for OER catalysts working in highly alkaline conditions. The self-healing of the OER-active nickel iron layered double hydroxides (NiFe-LDH) has not been successful due to irreversible leaching of Fe catalytic centers. Here, we investigate the introduction of cobalt (Co) into the NiFe-LDH as a promoter for in situ Fe redeposition. An active borate-intercalated NiCoFe-LDH catalyst is synthesized using electrodeposition and shows no degradation after OER tests at 10 mA cm(-2) at pH 14 for 1000 h, demonstrating its self-healing ability under harsh OER conditions. Importantly, the presence of both ferrous ions and borate ions in the electrolyte is found to be crucial to the catalyst's self-healing. Furthermore, the implementation of this catalyst in photoelectrochemical devices is demonstrated with an integrated silicon photoanode. The self-healing mechanism leads to a self-limiting catalyst thickness, which is ideal for integration with photoelectrodes since redeposition is not accompanied by increased parasitic light absorption.
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