Synergistic Supercritical Water 'Wet' Activated Biomass Carbon as High Performances Electrode Materials for Supercapacitor

被引:19
作者
Yan, Hao [1 ]
Li, Yunmeng [1 ]
Guo, Xiaoya [1 ]
Zhou, Muxuan [1 ]
Wang, Hui-Qiong [2 ,3 ]
Dai, Yang [1 ]
Zheng, Jin-Cheng [2 ,3 ,4 ]
机构
[1] Shanghai Univ, Sch Environm & Chem Engn, Dept Chem Engn, Shanghai 200444, Peoples R China
[2] Xiamen Univ, Dept Phys, Xiamen 361005, Peoples R China
[3] Xiamen Univ, Collaborat Innovat Ctr Optoelect Semicond & Effic, Xiamen 361005, Peoples R China
[4] Xiamen Univ Malaysia, Sepang, Selangor 439000, Malaysia
基金
中国国家自然科学基金;
关键词
DOUBLE-LAYER CAPACITORS; TEMPLATED SYNTHESIS; POROUS CARBONS; SURFACE-AREA; HIGH-ENERGY; NANOSHEETS;
D O I
10.1149/2.0391810jes
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The 'dry' activation by mixing precursor and activation agent, is considered as a traditional method to prepare porous carbon. Herein, we develop a distinct 'wet' activation approach, that is, synergistic supercritical water and KOH activation to prepare porous carbon from pistachio shell. The activation process is less activation agent-consuming and time-costing, highly efficient and free of harmful products, in accord with the principles of green chemistry. The sample presents a microporous structure and medium specific surface area (200-900 m(2) g(-1)) with a partial graphitization confirmed by X-ray Difffraction and Raman. The sample also exhibits stable surface groups. The samples are evaluated as the potential electrode material for supercapacitor. The sample S1 shows excellent electrochemical performance, delivering a high capacitance of 232 F g(-1) (260 F cm(-3)) at 0.5 A g(-1), and an impressive 144 F g(-1) (161 F cm(-3)) at 100 A g(-1), as well as long cyclic capability (>10000 cycles). Remarkably, it also possesses a surface area normalized capacitance as high as 65.5 mu F cm(-2). The two-electrode symmetric cell also demonstrates its potential practical performance. This method provides a promising route to achieve the green, cost-effective, and large-scale preparation of porous carbon from biomass for energy storage. (C) 2018 The Electrochemical Society.
引用
收藏
页码:A2075 / A2083
页数:9
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