碳纤维
化学工程
拉曼光谱
催化作用
石墨
氧化物
X射线光电子能谱
作者
Kuang-Hsu Wu,Dawei Wang,Ian R. Gentle
出处
期刊:Carbon
[Elsevier]
日期:2015-01-01
卷期号:81 (1): 295-304
被引量:42
标识
DOI:10.1016/j.carbon.2014.09.060
摘要
Abstract Carbon-based electrocatalysts without metal or with trace metals are potentially effective in delivering robust and efficient oxygen reduction if the active sites are covalently located on a conductive support. In this report, we demonstrate that active sites on carbon nanotubes are created upon oxidation for efficient oxygen reduction to peroxide, whereas the saturation of oxygen groups at graphitic basal planes leads to the loss of electron conduction thereby deteriorates the electrocatalytic activity. Importantly, oxygen groups at different locations (basal/edge sites) and with different structures (C O, C–OH, COOH, epoxide, etc.) have a significant impact on the oxygen reduction activity. In particular, epoxide bound oxidized carbon shows superior activity among other oxidized carbon nanotubes.
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