Modifying Commercial Carbon with Trace Amounts of ZIF to Prepare Derivatives with Superior ORR Activities

Reducing costs while maintaining high activities and stabilities of oxygen reduction reaction (ORR) catalysts has long been pursued for applications to membrane fuel cells. Here, an absorption‐reaction method is used to prepare a zeolitic imidazolate framework coated commercial carbon, and the pyrol...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2017-07, Vol.29 (27), p.n/a
Main Authors: Ni, Bing, Ouyang, Chen, Xu, Xiaobin, Zhuang, Jing, Wang, Xun
Format: Article
Language:English
Subjects:
Absorption
Carbon
Carbon black
carbon materials
Catalysts
Co3O4
Cost engineering
Current density
Decay
Fuel cells
Materials handling
Materials science
Metal-organic frameworks
oxygen reduction reaction
Oxygen reduction reactions
Pyrolysis
Raw materials
Soaking
Voltammetry
zeolitic imidazolate frameworks
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Summary:Reducing costs while maintaining high activities and stabilities of oxygen reduction reaction (ORR) catalysts has long been pursued for applications to membrane fuel cells. Here, an absorption‐reaction method is used to prepare a zeolitic imidazolate framework coated commercial carbon, and the pyrolysis of such material brings about impressive ORR activities and stabilities with large diffusion‐limited current density, half‐wave potential, and no obvious decay after 10 000 cyclic voltammetry cycles, which is even better than that of the commercial Pt/C catalysts. The absorption‐reaction method is realized by simply soaking the commercial carbon black sequentially in Co(NO3)2 and 2‐methylimidazole solutions at ambient conditions. The detailed analysis on such carbon materials reveals that both Co and N are essential to activities, even the amount of N and Co species is very low. The reduction of raw materials and simplified handling procedures result in well‐controlled costs in applications. Sequentially soaking in Co(NO3)2 and 2‐methylimidazole solutions, followed by calcination, can impart high oxygen reduction reaction activities and stabilities to commercial carbon black. Detailed analysis on such carbon materials reveals that both Co and N are essential to activities, even the amount of N and Co species is very low.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201701354