期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 136, 期 25, 页码 9070-9077出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja5033474
关键词
-
资金
- National Research Foundation of Korea (NRF)
- Korean government (MEST) [2009-0092783]
- Nanomaterial Technology Development Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2012M3A7B4049807]
- Global Frontier R&D Program on Center for Hybrid Interface Materials (HIM) [2013M3A6B1078884]
- Ministry of Science, ICT & Future Planning
- National Research Foundation of Korea [10Z20130011056, 2012M3A7B4049807, 2009-0092783] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
N-doped carbon materials are considered as next-generation oxygen reduction reaction (ORR) catalysts for fuel cells due to their prolonged stability and low cost. However, the underlying mechanism of these catalysts has been only insufficiently identified, preventing the rational design of high-performing catalysts. Here, we show that the first electron is transferred into O-2 molecules at the outer Helmholtz plane (ET-OHP) over a long range. This is in sharp contrast to the conventional belief that O-2 adsorption must precede the ET step and thus that the active site must possess as good an O-2 binding character as that which occurs on metallic catalysts. Based on the ET-OHP mechanism, the location of the electrode potential dominantly characterizes the ORR activity. Accordingly, we demonstrate that the electrode potential can be elevated by reducing the graphene size and/or including metal impurities, thereby enhancing the ORR activity, which can be transferred into single-cell operations with superior stability.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据