Enhancement of charge efficiency for a capacitive deionization cell using carbon xerogel with Modified potential of zero charge

被引：98

作者：

Gao, Xin ^{[1
]}

Omosebi, Ayokunle ^{[1
]}

Landon, James ^{[1
]}

Liu, Kunlei ^{[1
]}

机构：

[1] Univ Kentucky, Ctr Appl Energy Res, Lexington, KY 40511 USA

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2014年 / 39卷

关键词：

Carbon xerogel; Capacitive deionization; TEOS-modification; Potential of zero charge; Potential distribution; Charge efficiency; ELECTRODES; IMPROVEMENT; ENERGY;

D O I：

10.1016/j.elecom.2013.12.004

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The use of tetraethyl orthosilicate to modify carbon xerogel materials results in the formation of silica oxide and carboxylic functional groups at the carbon's surface. Voltammetric characterization indicates that the potential of zero charge (PZC) of the modified samples was positively shifted to the extent affected by dip-coating repetitions. Cycling tests were performed at 1.2 V for 15 cycles in a flow-through cell with similar to 4 mM deaerated NaCl. The average charge efficiency of the cell was significantly enhanced from similar to 60% to similar to 86% when the modified electrode served as the cathode. This increase in efficiency was mainly attributed to the shifting of the PZC at the cathode towards the cell short-circuit potential, thereby reducing co-ion repulsion at the cathode. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：22 / 25

页数：4

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