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Carbon xerogels electrochemical oxidation and correlation with their physico-chemical properties

AuthorsAlegre Gresa, Cinthia ; Sebastián del Río, David ; Lázaro Elorri, María Jesús
KeywordsCarbon xerogels
Carbon electro-oxidation
Oxygen groups
Amorphous carbon
Issue Date20-Dec-2018
CitationCarbon 144: 382-394 (2019)
AbstractThe electrochemical oxidation of carbon represents a relevant limitation for the application of carbon-based materials at the electrodes of several electrochemical devices, like fuel cells, metal-air batteries, water electrolyzers or supercapacitors. Understanding the key influencing parameters is thus of paramount importance to prevent and avoid the degradation of carbon materials. In the present investigation, carbon xerogels (CXGs) as a model of synthetic amorphous carbon, were studied on the basis of different surface chemistry and structure. Electro-oxidation experiments consisted of potential holding (1.2 V vs. RHE) on electrodes prepared with CXGs. The results indicate that the presence of oxygen groups (-C-O) and a higher ordering degree hinder the carbon oxidation reaction. A sub-structural parameter considering both the amount of oxygen-free carbon atoms (C-C + C*-C-O) from X-ray photoelectron spectroscopy, and the disordering degree from Raman spectra (in terms of ID/IG) is here proposed as a new factor to evaluate the tendency of an amorphous carbon material, like xerogels, to be electrochemically oxidized.
Description10 Figuras, 8 Tablas.-- Material suplementario disponible en línea en la página web del editor.
Publisher version (URL)http://dx.doi.org/10.1016/j.carbon.2018.12.065
Appears in Collections:(ICB) Artículos
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