Long-term cycling of carbon-based supercapacitors in aqueous media

被引：84

作者：

Ruiz, V. ^{[1
]}

Santamaria, R. ^{[1
]}

Granda, M. ^{[1
]}

Blanco, C. ^{[1
]}

机构：

[1] CSIC, Inst Nacl Carbon, E-33080 Oviedo, Spain

来源：

ELECTROCHIMICA ACTA | 2009年 / 54卷 / 19期

关键词：

Activated carbon; Electrochemical capacitor; Double layer; Pseudocapacitance; Long-term cycling; DOUBLE-LAYER CAPACITANCE; ACTIVATED CARBONS; ELECTROCHEMICAL CAPACITORS; THERMAL-TREATMENT; ANODIC-OXIDATION; ELECTRODES; COMPOSITES; SURFACES; DENSITY; OXIDES;

D O I：

10.1016/j.electacta.2009.03.024

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The behaviour of mesophase-derived electrodes on long-duration cycling conditions was studied in 1 M sulfuric acid and 6 M potassium hydroxide. Variation in the specific capacitance values with the number of cycles shows a good cycling life performance in acidic media but very poor in an alkaline electrolyte. The total loss of capacitance after 7000 cycles in acidic media is 8% at 0.6 V and 16% at 1 V, whereas in the basic electrolyte the reduction in the capacitance values is 72%. even at a very small operating voltage (0.6V). This behaviour was associated to the strong oxidation of the positive electrode caused by the progressive shift of the working potential towards very positive potential values during cycling. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：4481 / 4486

页数：6

共 35 条

[1] Examination of the double-layer capacitance of an high specific-area C-cloth electrode as titrated from acidic to alkaline pHs [J].