石墨烯
材料科学
电解质
催化作用
退火(玻璃)
兴奋剂
化学工程
氧气
甲醇
碳纤维
氮气
氧还原
氧还原反应
比表面积
纳米技术
电极
化学
电化学
光电子学
物理化学
复合材料
有机化学
复合数
工程类
作者
Yaru Bian,Hao Wang,Jintang Hu,Bowen Liu,Dong Liu,Liming Dai
出处
期刊:Carbon
[Elsevier]
日期:2020-06-01
卷期号:162: 66-73
被引量:72
标识
DOI:10.1016/j.carbon.2020.01.110
摘要
Nitrogen (N)-doped porous carbon materials have attracted tremendous attention as low-cost and highly-efficient electrocatalysts for oxygen reduction reaction (ORR). In this study, holey graphene with a high edge pyridinic N-doping (43.0% in 5.1 at.% N, N-hG) has been prepared via a modified two-step synthetic method, involving the annealing in air at 430 °C to create holes, followed by N-doping in Ar/NH3 atmosphere at 850 °C. The resultant N-hG was demonstrated to possess a high specific surface area (1170.05 m2 g−1), outstanding ORR performance (E1/2 = 0.833 V, Eonset = 0.91 V) close to those of Pt/C catalyst in alkaline electrolyte, and a better long-term stability and methanol tolerance than Pt/C. The outstanding performance was attributed to the high specific surface area with abundant exposed active sites as well as the high edge N-content and large number of holes rich with the edge defects to ensure high catalytic activities. Furthermore, a mechanistic understanding of the hole formation in graphene lattice and subsequent edge N-doping was obtained, which could be used to guide the design and development of various new low-cost, highly efficient carbon electrocatalysts for ORR and beyond.
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