期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 22, 页码 25037-25041出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c05450
关键词
aberration-corrected TEM; active metal site; electrocatalyst; quasi-metal-organic framework; oxygen evolution reaction
资金
- Program for the National Natural Science Foundation of China [NSFC-21901221, U1904215, 21875207]
- Natural Science Foundation of Jiangsu Province [BK20190870]
- Lvyangjinfeng Talent Program of Yangzhou
Exposing catalytically active metal sites in metal-organic frameworks with maintained porosity could accelerate electron transfer, leading to improved performances in electrochemical energy storage and conversion. Here, we report a series of quasi-ZIF-67 obtained from low temperature calcination of ZIF-67 for electrocatalytic oxygen evolution reaction (OER) and reveal the nanostructural structure via the spherical aberration-corrected transmission electron microscopy. The quasi-ZIF-67-350 not only possesses a large Brunauer-Emmett-Teller surface area of 2038.2 m(2).g(-1) but also presents an extremely low charge- transfer resistance of 15.0 Omega. In catalyzing the OER process, quasi-ZIF-67-350 displays a low overpotential of 286 mV at 10 mA cm(-2) in the electrolyte of 1.0 M KOH. The acquired quasi-ZIF-67 demonstrates a high catalytic activity in OER, and the controlled calcination strategy undoubtedly paves a way in synthesizing low-cost and efficient electrocatalysts.
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