石墨烯
氮气
材料科学
氧气
化学
电催化剂
催化作用
氧还原反应
碳纤维
活动站点
电化学
兴奋剂
还原(数学)
无机化学
化学工程
光化学
氧还原
过电位
法拉第效率
析氧
纳米技术
电极
有机化学
复合数
复合材料
物理化学
几何学
光电子学
数学
作者
Meng-Si Li,Changlai Wang,Yang Yang,Peng Jiang,Zhiyu Lin,Guoliang Xia,Kang Yang,Pengping Xu,Qianwang Chen
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2018-09-24
卷期号:6 (11): 14033-14041
被引量:9
标识
DOI:10.1021/acssuschemeng.8b02573
摘要
In recent years, 3d transition metals or alloys encapsulated by graphene layers (M@NG) have been emerging as prospective electrocatalysts especially for hydrogen evolution reactions (HERs) and oxygen evolution reactions (OERs). However, this strategy is limited in preparation of high-performance oxygen reduction reaction (ORR) catalysts. Herein we prepared Co@Ag bimetallic nanoparticles embedded in nitrogen-rich graphene layers via pyrolysis metal organic frameworks (MOFs). The catalyst displays extraordinarily high ORR performance with a high onset potential of 0.989 V and a half-wave potential of 0.872 V in 0.1 M KOH. Moreover, it shows a superb long-term stability performance after 5000 cycles on account of the carbon layers that protect the material from corrosion as well as high methyl alcohol tolerance under methanol environments. Density functional theory calculations suggest that carbon atoms, which are adjacent to nitrogen dopants in Co@Ag@NC, are active sites for ORR. Especially, Ag “mantle” in ...
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