Experimentelle Analyse der Mikrostrukturbildung am Einzelpartikel und Mikrotropfen

Abstract

© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Chem. Ing. Tech. 2014, 86, No. 9, 1541–1567 Classical approaches to combine mesoporosity with a high graphitization are mainly using softor hardtemplating techniques [1]. However, drawbacks are the limited degree of graphitization obtained and the functionalization/impurity of the materials. In contrary, carbidederived carbon (CDC) is a high-purity carbon originating from the reactive extraction of carbides [2]. The applied extraction conditions and the choice of the precursor allow for tuning of material properties [2]. Nevertheless, for CDC materials, there is a lack of combining mesoporosity with a graphitic character without further treatments. The reactive extraction of titanium carbide with chlorine above 1200 °C as a one-step process was studied, resulting in high-purity graphitic and mesoporous carbons. The mean pore size increases from 0.71 nm at 500 °C to 3.70 nm at 1400 °C. Below 1000 °C X-ray amorphous carbons result whereas at 1200 °C graphite reflexes start to get observable. Further TEM and Raman studies proof the higher graphitic order. In line with the increasing graphitic character, cyclic voltammetric measurements reveal an enhanced electrochemical stability.