Ontology type: schema:ScholarlyArticle Open Access: True
2022-04-25
AUTHORSZongsu Han, Zheng Yan, Kunyu Wang, Xinchen Kang, Kai Lv, Xiaoping Zhang, Zhen Zhou, Sihai Yang, Wei Shi, Peng Cheng
ABSTRACTThe development of efficient electrocatalysts based on non-noble metals for oxygen evolution reaction (OER) remains an important and challenging task. Multinuclear transition-metal clusters with high structural stability are promising OER catalysts but their catalytic role is poorly understood. Here we report the crystallographic observation of OER activity over robust {Ni12}-clusters immobilised in a porous metal-organic framework, NKU-100, by single-crystal X-ray diffraction as a function of external applied potential. We observed the aggregation of confined oxygen species around the {Ni12}-cluster as a function of applied potential during the electrocatalytic process. The refined occupancy of these oxygen species shows a strong correlation with the variation of current density. This study demonstrates that the enrichment of oxygen species in the secondary co-ordination sphere of multinuclear transition-metal clusters can promote the OER activity. More... »
PAGES1-6
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DOIhttp://dx.doi.org/10.1007/s11426-022-1217-7
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