電気化学処理による水溶液電気二重層キャパシタの高容量化 [in Japanese] Capacitance Enhancement of Aqueous EDLC Systems by Electrochemical Treatment [in Japanese]
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The electrochemical treatment of activated carbon electrodes has been investigated as a novel method enhancing the capacitance of electric double layer capacitor (EDLC) electrodes. The treatment at 0.7 V floating in a week at 70°C can be applied to EDLC with aqueous electrolytes. In 30 wt% H<sub>2</sub>SO<sub>4</sub>/H<sub>2</sub>O electrolyte, the treatment causes a capacitance increase in a low voltage region: 0–0.4 V. On the other hand, in 3.5 M NaBr/H<sub>2</sub>O electrolyte, it results in a remarkable capacitance increase of 2.4 times in a high voltage region: 0.4–1.0 V. These results suggest that the treatment mechanisms in the above electrolyte systems should be different. We report herein the origins and mechanisms of these capacitance increases.
Electrochemistry 75(3), 273-279, 2007-03-05
The Electrochemical Society of Japan