کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6472653 | 1424135 | 2016 | 11 صفحه PDF | دانلود رایگان |
- Green and one-pot hydrothermal synthesis of pyridinic rich N-doped graphene.
- Higher ORR activity than previous hydrothermally prepared ones.
- Revealing of role of Ï-electrons and LP-electrons of pyridinic-N towards ORR.
- Superior performance than commercial Pt/C electrocatalyst in real fuel cells.
Nitrogen-doped graphenes are promising oxygen reduction reaction (ORR) electrocatalysts for replacement of Pt-based electrocatalysts. In this paper, 3-D mesoporous nitrogen-doped reduced graphene oxides (NRGOs) with different nitrogen contents (1.0-4.7%) were hydrothermally synthesized through manipulation of relative amount of the graphite oxide (GtO) and melamine. Eight characterization techniques including FESEM, TEM, BET, XRD, Raman, FTIR, UV-vis, and XPS were used to evaluate the structural and electronic properties of the prepared nanomaterials. The ORR performance of NRGOs and commercial 20Â wt% Pt/C were examined in three electrode cell and direct methanol fuel cell (DMFC) setups. It was revealed that N-content of NRGOs (regardless of their bonding configurations) promotes ORR performance at lower potentials due to activation and strengthen of Ï-electrons of graphene framework while pyridinic-N content has significant role in ORR at higher potentials because of activation of their lone pair electrons. Furthermore, the DMFC with NRGO containing 4.1% (4.6Â wt%) nitrogen as cathode electrocatalyst, due to its higher selectivity towards ORR, presents superior output power compared to the commercial 20Â wt% Pt/C one.
N-doped graphene due to its higher selectivity towards ORR has superior performance (power output) than commercial Pt/C electrocatalyst in real fuel cell conditions.101
Journal: Electrochimica Acta - Volume 222, 20 December 2016, Pages 608-618