期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 6, 页码 5213-5221出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12197
关键词
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资金
- National Natural Science Foundation of China [51402202, 51622208]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Efficient bifunctional electrocatalysts with desirable oxygen activities are closely related to practical applications of renewable energy systems including metalair batteries, fuel cells, and water splitting. Here a composite material derived from a combination of bimetallic zeolitic imidazolate frameworks (denoted as BMZIFs) and Fe/N/C framework was reported as an efficient bifunctional catalyst. Although BMZIF or Fe/N/C alone exhibits undesirable oxygen reaction activity, a combination of these materials shows unprecedented ORR (half-wave potential of 0.85 V as well as comparatively superior OER activities (potential@10 mA cm(-2) of 1.64 V), outperforming not only a commercial Pt/C electrocatalyst but also most reported bifunctional electrocatalysts. We then tested its practical application in Znair batteries. The primary batteries exhibit a high peak power density of 235 mW cm(-2), and the batteries are able to be operated smoothly for 100 cycles at a curent density of 10 mA cm(-2). The unprecedented catalytic activity can be attritued to chemical coupling effects between Fe/N/C and BMZIF and will aid the development of highly active electrocatalysts and applications for electrochemical energy devices.
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