Enabling high-rate electrochemical flow capacitors based on mesoporous carbon microspheres suspension electrodes

JOURNAL OF POWER SOURCES

卷:364

Article

Tian, Meng¹  Sun, Yueqing¹  Zhang, Chuanfang (John)^2,3  Wang, Jitong¹  Qiao, Wenming¹  Ling, Licheng¹  Long, Donghui¹ 

[1] East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

[2] Trinity Coll Dublin, CRANN Res Ctr, Sch Chem, Dublin 2, Ireland

[3] Trinity Coll Dublin, AMBER Res Ctr, Sch Chem, Dublin 2, Ireland

关键词: Electrochemical flow capacitor;    Mesoporous carbon microsphere;    Suspension electrode;    High rate capability;    Grid energy storage;   

DOI  :  10.1016/j.jpowsour.2017.08.001

来源: Elsevier

【 摘 要 】

Electrochemical flow capacitor (EFC) is a promising technology for grid energy storage, which combines the fast charging/discharging capability of supercapacitors with the scalable energy capacity of flow batteries. In this study, we report a high-power-density EFC using mesoporous carbon microspheres (MCMs) as suspension electrodes. By using a simple yet effective spray-drying technique, monodispersed MCMs with average particle size of 5 gm, high BET surface area of 1150-1267 m(2) g(-1), large pore volume of 2-4 cm(3) g(-1) and controllable mesopore size of 7-30 nm have been successfully prepared. The resultant MCMs suspension electrode shows excellent stability and considerable high capacitance of 100 F g(-1) and good cycling ability (86% of initial capacitance after 10000 cycles). Specially, the suspension electrode exhibits excellent rate performance with 75% capacitance retention from 2 to 100 mV s(-1), significantly higher than that of microporous carbon electrodes (20-30%), due to the developed mesoporous channels facilitating for rapid ion diffusion. In addition, the electrochemical responses on both negative and positive suspension electrodes are studied, based on which an optimal capacitance matching between them is suggested for large-scale EFC unit. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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