標題: Electrochemical degradation of Nafion ionomer to functionalize carbon support for methanol electro-oxidation
作者: Hsieh, Yu-Chi
Chen, Jing-Yu
Wu, Pu-Wei
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Nafion ionomer;Carbon functionalization;Cyclic voltammetry;Methanol electro-oxidation;Pt
公開日期: 15-十月-2011
摘要: An effective electrochemical route to produce functional groups on carbon surface is demonstrated. Cyclic voltammetric (CV) sweeps are performed in 0.5 M H(2)SO(4) electrolyte on electrodes containing carbon cloth, Vulcan XC72R, and Nation ionomer. With supply of ambient oxygen, the generation of hydroxyl radicals from the oxygen reduction reaction during CV cycles initiates the decomposition of Nation ionomer that leads to formation of oxygenated functional groups on the carbon surface. Ion chromatography confirms the dissolution of sulfate anions upon CV scans. Raman analysis suggests a minor alteration for the carbon structure. However, X-ray photoelectron spectroscopy indicates a significant increase of oxygenated functional groups in conjunction with notable reduction in the fluorine content. The amount of the oxygenated functional groups is determined by curve fitting of C is spectra with known constituents. These functional groups can also be found by immersing the as-prepared electrode in a solution containing concentrated residues from Nation ionomer decomposition. The functionalized electrode allows a 170% increment of Pt ion adsorption as compared to the reference sample. After electrochemical reductions, the functionalized electrode reveals significant improvements in electrocatalytic abilities for methanol oxidation, which is attributed to the oxygenated functional groups that facilitates the oxidation of CO on Pt. (C) 2011 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jpowsour.2011.05.068
http://hdl.handle.net/11536/18662
ISSN: 0378-7753
DOI: 10.1016/j.jpowsour.2011.05.068
期刊: JOURNAL OF POWER SOURCES
Volume: 196
Issue: 20
起始頁: 8225
結束頁: 8233
顯示於類別:期刊論文


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