期刊
CHEMELECTROCHEM
卷 7, 期 7, 页码 1739-1747出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.202000011
关键词
oxygen reduction; electrocatalysis; graphene-based catalysts; PEMFC; AEMFC
A simple synthesis method was used to prepare an active oxygen reduction reaction (ORR) electrocatalyst based on iron and nitrogen co-doped graphene for polymer electrolyte fuel cell applications. For the synthesis of the ORR catalysts, two different graphene-based materials, commercially available graphene (Gra) and graphene oxide (GO), were used as the carbon substrates. The half-cell experiments conducted by using the rotating disc electrode (RDE) method revealed that Fe-N-Gra showed much higher ORR electrocatalytic activity than Fe-N-GO in alkaline medium. This is attributed to the higher surface area, micro-/mesoporous nature and larger amount of Fe-N-x/amine moieties present in Fe-N-Gra compared to Fe-N-GO, as shown by different physicochemical methods. Almost half of the iron was confirmed to be in highly active Fe-N-x form by Fe-57 Mossbauer spectroscopy. Thus, the Fe-N-Gra as ORR catalyst was further selected to apply this for both proton exchange membrane (PEM) and anion exchange membrane (AEM) fuel cell tests.
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