Journal
CELL REPORTS PHYSICAL SCIENCE
Volume 1, Issue 11, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.xcrp.2020.100241
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Funding
- National Natural Science Foundation of China [51521001, 21890751]
- National Key Research and Development Program of China [2016YFA0202603]
- National Innovation and Entrepreneurship Training Program for College Students [WUT: 20191049701034]
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory [XHT2020-003]
- Fundamental Research Funds for the Central Universities [WUT: 2019III012GX, 2020III002GX]
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Fundamental investigations of reconstruction of oxygen evolution reaction (OER) pre-catalysts and performance evaluation under realistic conditions are vital for practical water electrolysis. Here, we capture dynamic reconstruction, including the geometric/phase structure, of hydrate molybdates at oxidized potentials. Etching-reconstruction engineering endows the formed NiOOH with a sub-5-nm particle-interconnected structure, as revealed by multi-angle electron tomography. The key to complete reconstruction is the multicomponent co-leaching-induced loose reconstruction layer, conductive to solution penetration and mass transport. This unique structure avoids particle agglomeration in catalysis and promotes complete exploitation of the catalyst with 1,350 h of durability to meet industrial requirements. Upon addition of iron during reconstruction, mainstream Fe-NiOOH with a retained structure forms. Coupled with MoO2-Ni arrays in a membrane-free and two-electrode cell, it achieves stable electrolysis in industrial-concentration KOH for 260 h. This work highlights the reconstruction chemistry of hydrate oxygen-evolving systems and their performance evaluation under industrial conditions.
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