کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6469663 | 1423976 | 2017 | 5 صفحه PDF | دانلود رایگان |
- Nitrobenzene (NB)-modified graphene nanosheets were used as a support for PtNPs.
- Oxygen electroreduction on the Pt-NB/G catalyst was studied in alkaline solution.
- Specific activity of Pt-NB/G for ORR was close to that of 20Â wt% Pt/C catalyst.
- Long-term durability test showed high stability of the Pt-NB/G catalyst in 0.1Â M KOH.
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 0.1Â M KOH solution have been studied and compared with that of the commercial Pt/C catalyst. The results obtained show that the NB-modified graphene nanosheets can be good Pt catalyst support with high stability and excellent electrocatalytic properties. The specific activity of Pt-NB/G for O2 reduction was 0.184Â mAÂ cmâ2, which is very close to that obtained for commercial 20Â wt% Pt/C catalyst (0.214Â mAÂ cmâ2) at 0.9Â 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.
311
Journal: Electrochemistry Communications - Volume 81, August 2017, Pages 79-83