TY - JOUR
T1 - Optimization of thermal oxidation of electrodes for the performance enhancement in all-vanadium redox flow battery
AU - Ghimire, Purna C.
AU - Schweiss, Rüdiger
AU - Scherer, Günther G.
AU - Lim, Tuti M.
AU - Wai, Nyunt
AU - Bhattarai, Arjun
AU - Yan, Qingyu
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/12
Y1 - 2019/12
N2 - Thermal oxidation of a graphite felt in air is the most widely used electrode activation method to enhance the performance of a vanadium redox flow battery. It has been reported extensively, but almost all previous studies used individual treatment protocols with only few parameter variations. In this paper, treatment time and temperature were varied systematically along with in-depth physicochemical and electrochemical analysis. Prolonged treatment time is chosen for oxidation at lower temperatures aiming at low material loss rates, whereas shorter periods are applied at higher treatment temperatures, which are associated with elevated material loss. Among the electrodes treated with various protocols, the best performance is observed with electrodes oxidized at 750 °C for 5 min. This study is important for both, reproducibly preparing samples at lab scale as well as commercial developers, where optimized and cost-effective pretreatment plays a significant role.
AB - Thermal oxidation of a graphite felt in air is the most widely used electrode activation method to enhance the performance of a vanadium redox flow battery. It has been reported extensively, but almost all previous studies used individual treatment protocols with only few parameter variations. In this paper, treatment time and temperature were varied systematically along with in-depth physicochemical and electrochemical analysis. Prolonged treatment time is chosen for oxidation at lower temperatures aiming at low material loss rates, whereas shorter periods are applied at higher treatment temperatures, which are associated with elevated material loss. Among the electrodes treated with various protocols, the best performance is observed with electrodes oxidized at 750 °C for 5 min. This study is important for both, reproducibly preparing samples at lab scale as well as commercial developers, where optimized and cost-effective pretreatment plays a significant role.
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U2 - 10.1016/j.carbon.2019.08.068
DO - 10.1016/j.carbon.2019.08.068
M3 - Article
AN - SCOPUS:85071398367
SN - 0008-6223
VL - 155
SP - 176
EP - 185
JO - Carbon
JF - Carbon
ER -