کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1275926 | 1497542 | 2013 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Nitrogen-doped graphene as catalysts and catalyst supports for oxygen reduction in both acidic and alkaline solutions Nitrogen-doped graphene as catalysts and catalyst supports for oxygen reduction in both acidic and alkaline solutions](/preview/png/1275926.png)
Solving slow kinetics of oxygen reduction reaction is critically important for the development of hydrogen fuel cells and direct methanol/ethanol fuel cells. In this study, graphene and nitrogen (N)-doped graphene were synthesized by a solvothermal method and investigated as catalysts as well as catalyst supports for oxygen reduction reactions. In comparison to graphene, N-doped graphene demonstrated higher electrocatalytic activity in both acidic and alkaline solutions. N-doped graphene can act directly as a catalyst to facilitate four-electron oxygen reductions in alkaline solution and two-electron reductions in acidic solution. On the other hand, when used as catalyst supports for Pt and Pt–Ru nanoparticles, N-doped graphene can contribute to four-electron oxygen reductions in acidic solution, yet demonstrate much slower reaction kinetics in alkaline solution. Our findings conclude that N-doped graphene can be developed as an efficient catalyst for oxygen reductions to replace the use of precious Pt catalysts in alkaline solution but not in acidic solution.
► Electrocatalytic activity of N-doped graphene in both acidic and alkaline solution.
► N-doped graphene can be directly used as a catalyst for ORR in alkaline solution.
► N-doped graphene is a two-electron oxidation catalyst for ORR in acidic solution.
► N-doped graphene activates Pt and Pt–Ru nanoparticles for ORR in acidic solution.
Journal: International Journal of Hydrogen Energy - Volume 38, Issue 3, 6 February 2013, Pages 1413–1418