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A Tunable Amorphous Heteronuclear Iron and Cobalt Imidazolate Framework Analogue for Efficient Oxygen Evolution Reactions
Author(s) -
Zhao Qingyun,
Lin Xiao,
Zhou Jing,
Zhao Chong,
Zheng Dehua,
Song Sanzhao,
Jing Chao,
Zhang Linjuan,
Wang JianQiang
Publication year - 2021
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000974
Subject(s) - oxygen evolution , tafel equation , overpotential , amorphous solid , chemistry , cobalt , chemical engineering , imidazolate , catalysis , heteronuclear molecule , electrochemistry , metal organic framework , water splitting , nanotechnology , inorganic chemistry , materials science , crystallography , electrode , adsorption , molecule , organic chemistry , photocatalysis , engineering
Abstract The structural diversity and tunable functionality of the amorphous metal‐organic frameworks (aMOFs) highlights this class of materials as a promising candidate for the development of sustainable energy technologies. The electrocatalytic performance in oxygen evolution reaction (OER) can be greatly improved by incorporating the hetero‐metallics into MOFs. Herein, the OER performance was significantly improved by the incorporation of Fe 3+ ions into the crystalline cobalt‐based MOF, leading to amorphous structure. Benefiting from the optimized surface morphology and electrochemical surface area, charge transport, was greatly facilitated. The Fe/Co aMOF with 1/4 ratio (labeled as AFC‐MOFs (1 : 4)) exhibited an excellent and stable OER activity, with an ultralow overpotential (256 mV at 10 mA cm −2 ) and Tafel slope of 42.7 mV dec −1 . XAS found that the majority of Co 2+ in AFC‐MOFs (1 : 4) is converted to low‐spin Co 3+ upon OER, while Fe 3+ is maintained during the OER process, supporting the synergistic catalytic mechanism between Fe and Co. This material outperforms benchmark IrO 2 , which could be attributed to the hollow amorphous structure and the optimized electronic properties.