期刊
SMALL
卷 17, 期 29, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202101312
关键词
defect creations; hydrogen evolution reactions; in situ oxidations; metal-organic frameworks; overall water splitting; oxygen evolution reactions; oxygen vacancies
类别
资金
- Basic Research Program [2017R1A2B3004917]
- National Research Foundation (NRF)
- Ministry of Science, ICT & Future Planning of the Republic of Korea
The development of a new type of freestanding, defect-rich mixed-metal oxide/hydroxide heterostructure was reported, showing excellent bifunctional properties with low overpotentials for both oxygen evolution reaction and hydrogen evolution reaction at a current density of 10 mA cm(-2).
Introducing defects and in situ topotactic transformation of the electrocatalysts generating heterostructures of mixed-metal oxides(hydroxides) that are highly active for oxygen evolution reaction (OER) in tandem with metals of low hydrogen adsorption barrier for efficient hydrogen evolution reaction (HER) is urgently demanded for boosting the sluggish OER and HER kinetics in alkaline media. Ascertaining that, metal-organic-framework-derived freestanding, defect-rich, and in situ oxidized Fe-Co-O/Co metal@N-doped carbon (Co@NC) mesoporous nanosheet (mNS) heterostructure on Ni foam (Fe-Co-O/Co@NC-mNS/NF) is developed from the in situ oxidation of micropillar-like heterostructured Fe-Co-O/Co@NC/NF precatalyst. The in situ oxidized Fe-Co-O/Co@NC-mNS/NF exhibits excellent bifunctional properties by demanding only low overpotentials of 257 and 112 mV, respectively, for OER and HER at the current density of 10 mA cm(-2), with long-term durability, attributed to the existence of oxygen vacancies, higher specific surface area, increased electrochemical active surface area, and in situ generated new metal (oxyhydr)oxide phases. Further, Fe-Co-O/Co@NC-mNS/NF (+/-) electrolyzer requires only a low cell potential of 1.58 V to derive a current density of 10 mA cm(-2). Thus, the present work opens a new window for boosting the overall alkaline water splitting.
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