A novel electrolyte composed of carbonate and CsVO₃-MoO₃ for electrochemical oxidation of graphite

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• 作者：Jia Liu ; Ke Ye ; Jia Zeng ; Guiling Wang ; Jinling Yin ; Dianxue Cao
• 关键词：Carbon electrooxidation ; Molten carbonate ; Direct carbon fuel cell ; Cesium vanadium trioxide ; Molybdenum trioxide
• 刊名：Electrochemistry Communications
• 出版年：January, 2014
• 年：2014
• 卷：38
• 期：Complete
• 页码：12-14
• 全文大小：660 K

文摘

The catalytic activity of a homogeneous molten salt consisting of (Li,Na,K)₂CO₃ with dissolved additions of CsVO₃-MoO₃ for graphite electrooxidation is investigated. This electrolyte forms a eutectic mixture with low melting point, high stability in the presence of CO₂, and catalytic activity for graphite electrooxidation. The current density of graphite electrooxidation in this novel electrolyte reaches 125 mA cm^鈭?#xA0;2 at 鈭?#xA0;0.4 V and 750 掳C, which is much higher than that obtained in the conventional molten carbonate electrolyte (47 mA cm^鈭?#xA0;2). More importantly, the addition of CsVO₃-MoO₃ significantly improves the electrooxidation activity of graphite at low temperature. The onset potential for graphite electrooxidation at 550 掳C is negatively shifted by 鈭?#xA0;0.3 V and the current density at 鈭?#xA0;0.4 V is increased by 6.7 times by introducing CsVO₃-MoO₃ into the molten (Li,Na,K)₂CO₃. The catalytic mechanism of CsVO₃-MoO₃ is briefly discussed.