ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
Carbon aerogels are very promising substrates for electrocatalyst deposition involved infuel cells. Their advantage over high surface area carbon blacks currently used, is the porousmonolithic structure yielding large pore volumes with controlled pore sizes. By changing thesynthesis parameters, it is possible to adjust their multi-scale structure which is strongly related tothe electrochemical performances. The aim of the lecture is to give a survey of information aboutthe multi-scale structure that can be obtained by small and wide angle X-ray scattering (SAXS andWAXS) techniques combined with contrast variation (CV). To this end, a series of SAXSexperiments on carbon aerogels are described and the analysis of the experimental data isexplained. Particular attention is paid to the determination of the specific surface area, SSAXS, and tothe reasons why WAXS curves combined to SAXS ones make this determination more pertinent.The physical meaning of similarity or difference between SSAXS and surface area determined by gasadsorption, SADS, is discussed and information obtained by using contrast variation (CV) isdescribed for two carbon aerogels prepared in different conditions
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.1847.pdf
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