High-performance aqueous asymmetric supercapacitor based on K0.3WO3 nanorods and nitrogen-doped porous carbon

JOURNAL OF POWER SOURCES

卷:330

Article

Ma, Guofu¹  Zhang, Zhiguo¹  Sun, Kanjun²  Feng, Enke¹  Peng, Hui¹  Zhou, Xiaozhong¹  Lei, Ziqiang¹ 

[1] Northwest Normal Univ, Coll Chem & Chem Engn, Key Lab Ecoenvironm Related Polymer Mat, Key Lab Polymer Mat Gansu Prov,Minist Educ, Lanzhou 730070, Peoples R China

[2] Lanzhou City Univ, Coll Chem & Environm Sci, Lanzhou 730070, Peoples R China

关键词: Supercapacitor;    Tungstate;    Biomass carbon;    Electrodes;   

DOI  :  10.1016/j.jpowsour.2016.09.022

来源: Elsevier

【 摘 要 】

A novel asymmetric supercapacitor device for energy storage is fabricated using K0.3WO3 nanorods as negative electrode and nitrogen-doped porous carbon (CBC-1) based on agricultural wastes corn bract as positive electrode. The K0.3WO3 nanorods are composed of some thinner needle-shaped nanorods which are parallel to each other, and the CBC-1 reveals rough surface of coral-like frameworks with abundant nanopores. The structures can provide high surface area, low diffusion paths and intercalation/de-intercalation of electrolyte ions between the electrode/electrolyte interfaces. Thus, the asymmetric supercapacitor exhibits high energy density about 26.3 Wh kg(-1) at power density of 404.2 W kg(-1) in the wide voltage region of 0-1.6 V, as well as a good electrochemical stability (80% capacitance retention after 1000 cycles). Such outstanding electrochemical behaviors imply the CBC-1//K0.3WO3 asymmetric supercapacitor is a promising practical energy-storage system. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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