Journal
NANO ENERGY
Volume 38, Issue -, Pages 281-289Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2017.05.042
Keywords
Surface functionalization; Zeolitic imidazolate framework; Iron-nitrogen active site; Oxygen reduction reaction; Carbon dioxide electroreduction
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Funding
- Ministry of Science and Technology of China [2016YFB0600901, 2013CB933100]
- National Natural Science Foundation of China [21573222, 21622607, 91545202, U1532117]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17020200]
- CAS Youth Innovation Promotion
- K. C. Wong Education Foundation in Ningbo University
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Isolated metal-nitrogen sites are highly active to catalyze the oxygen and carbon dioxide electroreduction, however, the limited content of isolated metal-nitrogen sites within carbon matrix urgently requires full exposure of the active sites on the surface for efficient catalysis. Herein, post-synthetic modification strategy is explored to selectively confine ammonium ferric citrate on the surface of zeolitic imidazolate framework-8 (ZIF-8) nanoparticles. After pyrolysis, isolated iron-nitrogen sites are generated and located on the carbon matrix surface. The highly exposed iron-nitrogen sites demonstrate excellent mass activity toward oxygen reduction reaction in acidic medium, outperforming most reported non-noble metal catalysts, and also show superior selectivity and mass activity toward carbon dioxide electroreduction compared to most reported noble metal catalysts.
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