期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 81, 期 -, 页码 79-83出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2017.06.009
关键词
Pt nanoparticles; Electrocatalysis; Oxygen reduction; Graphene; Fuel cells
资金
- Estonian Ministry of Education and Research [IUT20-16, IUT2-24]
- Estonian Research Council [9323]
- EU through European Regional Development Fund [TK141]
A systematic study on the electrocatalytic properties of Pt nanoparticles supported on nitrobenzene-modified graphene (Pt-NB/G) as catalyst for oxygen reduction reaction (ORR) in alkaline solution was performed. Graphene nanosheets were spontaneously grafted with nitrophenyl groups using 4-nitrobenzenediazonium salt. The electrocatalytic activity towards the ORR and stability of the prepared catalysts in 0.1 M KOH solution have been studied and compared with that of the commercial Pt/C catalyst. The results obtained show that the NBmodified graphene nanosheets can be good Pt catalyst support with high stability and excellent electrocatalytic properties. The specific activity of Pt-NB/G for O-2 reduction was 0.184 mA cm(-2), which is very close to that obtained for commercial 20 wt% Pt/C catalyst (0.214 mA cm(-2)) at 0.9 V vs. RHE. The Pt-NB/G hybrid material promotes a four-electron reduction of oxygen and can be used as a promising cathode catalyst in alkaline fuel cells.
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