High-capacitance KOH-activated nitrogen-containing porous carbon material from waste coffee grounds in supercapacitor

被引：93

作者：

Wang, Chen-Hao ^{[1
]}

Wen, Wei-Chen ^{[1
]}

Hsu, Hsin-Cheng ^{[1
]}

Yao, Bing-Yuan ^{[1
]}

机构：

[1] Natl Taiwan Univ Sci & Technol, Dept Mat Sci & Engn, Taipei 10607, Taiwan

来源：

ADVANCED POWDER TECHNOLOGY | 2016年 / 27卷 / 04期

关键词：

Waste coffee grounds; Supercapacitor; Functional groups; KOH activation; SURFACE FUNCTIONAL-GROUPS; DOUBLE-LAYER CAPACITANCE; ELECTRODE MATERIAL; ELECTROCHEMICAL STORAGE; MESOPOROUS CARBON; GRAPHENE OXIDES; HUMAN HAIR; PERFORMANCE; NANOTUBES; NANOFIBERS;

D O I：

10.1016/j.apt.2016.04.033

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Waste coffee grounds were activated by KOH at various pyrolysis temperatures, changing the ratio of the area of the mesoporous structure to that of the microporous structure, the surface area, the amount of oxygen and nitrogen functional groups in the grounds, and their chemical structure. At a pyrolysis temperature of 700 degrees C, the KOH-activated waste coffee grounds had a specific capacitance of 175 F g (1) at 1 A g (1) and 475 F g (1) at 0.1 A g (1) from the discharge profiles. Assembling the KOH-activated waste coffee grounds in a coin cell yielded an energy density and power density of 11 W h kg (1) and 7500 W kg (1), respectively, with an operating potential of 1.5 V, making waste coffee grounds a viable feedstock for manufacturing energy materials. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.

引用

页码：1387 / 1395

页数：9

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