Thermally modified graphite electrodes for the positive side of the zinc-cerium redox flow battery
Related Research Unit(s)
|Journal / Publication||Journal of the Electrochemical Society|
|Publication status||Published - 2015|
|Link to Scopus||https://www.scopus.com/record/display.uri?eid=2-s2.0-84928045220&origin=recordpage|
In this study, thermal modification of graphite electrodes for the positive side of the Zinc-Cerium redox flow battery is found to enhance their performance and stability by providing a larger and more chemically active surface area to carry out the Ce(III)/(IV) reaction. Prolonged calcination (>9.5 h) and firing temperatures greater than 600°C lead to a physical deterioration of the samples while at 300°C no effect on the cerium reaction within the investigated reaction temperature range (25-55°C) is evident. When treated at 600°C for 6 h, the milder oxidation conditions result in a porous graphite electrode (7.13 m2 g-1) with a low charge transfer resistance (0.14 mΩ cm-2) and negligible weight loss (WTL = 6%). This thermally treated electrode is robust under repetitive cycling (300 cyclic voltammograms) with no degradation occurring within the time frame of the experiment (20 h). The quasi-reversible kinetics of the Ce(III)/(IV) reaction improve with elevated temperatures (ko = 6.0 × 10-3 cm s-1, D = 8.5 × 10-6 cm2 s-1 and jo = 2.91 × 10-3 A cm-2) and are comparable to the present electrode of choice on this flow battery, the Pt-Ti mesh electrode.
Journal of the Electrochemical Society, Vol. 162, No. 6, 2015, p. A809-A819.
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Nikiforidis, G & Daoud, WA 2015, 'Thermally modified graphite electrodes for the positive side of the zinc-cerium redox flow battery', Journal of the Electrochemical Society, vol. 162, no. 6, pp. A809-A819. https://doi.org/10.1149/2.0041506jes
Nikiforidis, G., & Daoud, W. A. (2015). Thermally modified graphite electrodes for the positive side of the zinc-cerium redox flow battery. Journal of the Electrochemical Society, 162(6), A809-A819. https://doi.org/10.1149/2.0041506jes