Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 6, Pages 5213-5221Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12197
Keywords
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Funding
- National Natural Science Foundation of China [51402202, 51622208]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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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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