Li, L.Yang, H.Miao, J.Zhang, L.Wang, H.-Y.Zeng, Z.Huang, W.Dong, X.Liu, B.2020-03-122020-03-122017ACS Energy Letters, 2017; 2(2):294-3002380-81952380-8195http://hdl.handle.net/2440/123618Published: January 5, 2017Carbon-based nanomaterials have been widely studied as promising electrocatalysts for energy conversion and storage. Understanding the oxygen evolution and reduction reactions on carbon-based nanomaterials is of critical importance for development of highly active metal-free electrocatalysts. Here, the adsorption of oxygenated intermediates during oxygen evolution reaction (OER) on carbon nanotubes (CNTs) was examined by ex-situ X-ray photoelectron spectroscopy and in situ electrochemical impedance spectroscopy. The results demonstrate that the carbon atoms on CNTs near the C═O functional groups are active for OER. On the basis of this result, we further revealed the origin of the enhanced intermediate adsorption on surface-oxidized CNTs and the relationship between surface groups and apparent activation energy. Our study gained new understanding of OER on oxygen-doped carbon nanomaterials and provided an effective approach for investigating electrocatalysis on heteroatom-doped carbon electrocatalysts.en© 2017 American Chemical SocietyJournal article003007992310.1021/acsenergylett.6b006812-s2.0-85034090302391698