Nanoscale fine-tuning of porosity of carbide-derived carbon prepared from molybdenum carbide

摘要

Micro-and mesoporous carbide-derived carbon(CDC)was synthesised from molybdenum carbide(Mo2C)powder by gas phase chlorination in the temperature range from 400 to 1200 °C.Analysis of XRD results show that C(Mo2C),chlorinated at 1200 °C,consist mainly on graphitic crystallites of mean size,L_a=9 nm and L_c=7.5 nm.The first-order Raman spectra showed the graphite-like absorption peak at ~1587 cm~(-1)and the disorder-induced(D)peak at ~1348 cm~(-1).The low-temperature N2 adsorption experiments were performed and a specific surface area up to 1855 m~2 g~(-1)and total pore volume up to 1.399 cm~3 g~(-1)were obtained.Sorption measurements showed the presence of both micro-and mesop-ores after chlorination at 400-900 °C and only mesopores after chlorination at 1000°-1200 °C.Stepwise formation of micro-and mesopores was achieved and the peak pore size can be shifted from 0.8 nm up to 4 nm by increasing the chlorination temperature.