Characterization of a zeolite-templated carbon by electrochemical quartz crystal microbalance and in situ Raman spectroscopy

Abstract

Electrochemical quartz crystal microbalance was used to monitor the mass changes during the electrochemical characterization of a zeolite-templated carbon (ZTC) in 1 M H 2 SO 4 medium. Under electrochemical oxidation conditions, a high anodic current and a net mass increase were recorded, resulting in the increase of the specific capacitance owing to the contribution of the pseudocapacitance, mainly derived from the hydroquinone-quinone redox couple. Under more severe electrochemical conditions, a net mass loss was observed, revealing that electrochemical gasification took place. Surface chemistry, before and after the electrochemical treatments, was analyzed through temperature programmed desorption experiments. Furthermore, in situ Raman spectroscopy was used to further characterize the structural changes produced in ZTC under the electrochemical conditions applied, supporting that high potential values produce the electrochemical oxidation and degradation of the carbon material.

Successful functionalization of superporous zeolite templated carbon using aminobenzene acids and electrochemical methods

“…6). Therefore, it can be concluded that not all the CO-type surface oxygen groups that are formed during the electrochemical functionalization of ZTC are electroactive, in agreement with previous observations [39], and that most of the electroactive oxygen groups are still present after functionalization with ABA molecules, thus suggesting that overoxidation of the carbon material can be avoided when ABA monomers are added during the treatment. This opens the possibility of increasing the selectivity towards the most electroactive surface functional groups.…”

Extremely high electrical conductance of microporous 3D graphene-like zeolite-templated carbon framework

“…In addition, the Raman spectra exhibited no significant difference in the intensity ratio of the D- and G-bands or the band broadness for the carbon samples obtained using the different synthesis conditions because zeolite-templated carbons normally show a very broad intrinsic D-band that is attributed to the presence of five- or seven-membered carbon rings in the curved carbon structure (Supplementary Fig. 2 ) 3 , 13 , 23 , 24 .…”

Oxygen-reduction catalysis of N-doped carbons prepared via heat treatment of polyaniline at over 1100 °C

“…This band is associated to a lattice vibration analogous to that of the G band but involving graphene layers which are not directly sandwiched between two other graphene layers (i.e. 'boundary layer planes') [28][29][30][31] . Samples treated at 1100 and 1200 ºC have similar Raman spectra.…”