Complex temperature dependence of the oxidation of pyrolytic graphite by CO2

Novel Impact of Short Term Aging on the Electrochemistry of CO[sub 2] Treated Synthetic Graphite

“…Small graphite samples were CO 2 treated for gradually increasing times at elevated temperatures, until significant mass loss had been achieved. As steady-state conditions for CO 2 oxidation of graphite were previously reported above 2-3% mass lost, 26 and CO 2 treatment was previously reported to lead to more gradual graphite burnoff than other oxidation techniques, [25][26][27] CO 2 treatment was utilized here to systematically generate a series of synthetic graphite LK-702 samples with varying particle size, particle shape, surface area, and crystallite size characteristics. Treated samples were then characterized using scanning electron microscopy ͑SEM͒ imaging, Brunauer-Emmett-Teller ͑BET͒ surface area, methylene blue adsorption surface area, thermogravimetric ͑TG͒ analysis, differential thermal ͑DT͒ analysis and X-ray powder diffraction ͑XRD͒ measurements.…”

“…24 The CO 2 oxidation of graphite has been a subject of interest for many years, where CO 2 oxidation has been found to result in a slower mass loss of graphite than O 2 or air oxidation. [25][26][27][28][29][30][31] Recently, the short term CO 2 treatment of graphite was studied by Winter and co-workers as a means of graphite surface modification. [32][33][34] As discussed below, Winter and coworkers found short term CO 2 treatment of Timrex graphite to result in a lower irreversible capacity.…”