Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 11, Pages 9699-9709Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b16851
Keywords
carbon nanoframes; ZIF-8; high dispersion; oxygen reduction; fuel cell
Funding
- National Natural Science Foundation of China (NSFC) [21276098, 21476088, 51302091, U1301245]
- China Postdoctoral Science Foundation [2016M592492]
- Department of Science and Technology of Guangdong Province [2014A010105041, 2015B010106012]
- Natural Science Foundation of Guangdong Province [2015A030312007]
- Educational Commission of Guangdong Province [2013CXZDA003]
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A series of ZIF-derived Fe N codoped carbon materials with a well-defined morphology, high surface area, tunable sizes and porous nanoframe structure was successfully prepared by synthesizing Fe-doped ZIF-8 through the assembly of Zn2+ ions with 2-methylimidazole in the presence of iron(III) acetylacetonate, followed by pyrolysis at a high temperature and in an Ar atmosphere. The prepared optimum catalyst materials exhibited excellent activity for the oxygen reduction reaction (ORR) and outstanding durability in both acidic and alkaline solutions. We found that Fe doping during the ZIF-8 synthesis stage was crucial to achieve the materials' well-defined morphology, tunable size, good particle dispersion, and high performance. XPS revealed that Fe doping greatly enhanced the fractions of graphitic-N and pyridinic-N and decreased the fraction of oxidized-N. We suggest that the porosity and high surface area of the nanoframe structure originated from the metal organic frameworks, the high dispersion of Fe in the nanoframe, and the enhanced proportions of active N species, all of which were responsible for the materials' significantly enhanced ORR performance.
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