催化作用
石墨烯
氧还原反应
氮气
电化学
石墨
活动站点
路易斯酸
无机化学
兴奋剂
吸附
化学
碳纤维
氧气
材料科学
纳米技术
有机化学
电极
物理化学
复合数
复合材料
光电子学
作者
Donghui Guo,Riku Shibuya,Chisato Akiba,Shunsuke Saji,Takahiro Kondo,Junji Nakamura
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2016-01-22
卷期号:351 (6271): 361-365
被引量:3403
标识
DOI:10.1126/science.aad0832
摘要
Nitrogen (N)-doped carbon materials exhibit high electrocatalytic activity for the oxygen reduction reaction (ORR), which is essential for several renewable energy systems. However, the ORR active site (or sites) is unclear, which retards further developments of high-performance catalysts. Here, we characterized the ORR active site by using newly designed graphite (highly oriented pyrolitic graphite) model catalysts with well-defined π conjugation and well-controlled doping of N species. The ORR active site is created by pyridinic N. Carbon dioxide adsorption experiments indicated that pyridinic N also creates Lewis basic sites. The specific activities per pyridinic N in the HOPG model catalysts are comparable with those of N-doped graphene powder catalysts. Thus, the ORR active sites in N-doped carbon materials are carbon atoms with Lewis basicity next to pyridinic N.
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