Waste activated carbon transformed to electrode of supercapacitor through combining with Co(OH)2

doi:10.1016/j.electacta.2020.137475

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	Waste activated carbon transformed to electrode of supercapacitor through combining with Co(OH)2
	Xu, Cheng; Chen, Yong; Ma, Yannan; Huang, Jiandi; Zhao, Jiang; Xu, Hui
刊名	Electrochimica Acta
	2021-01-20
卷号	367
关键词	Activated carbon Cyclic voltammetry Electrodes Pollution Potassium hydroxide Precipitation (chemical) Scanning electron microscopy Supercapacitor X ray photoelectron spectroscopy Asymmetric supercapacitor Electrochemical impedance spectra Galvanostatic charge discharges Hybrid electrodes Multi-functional materials Precipitation methods Secondary pollution Specific capacities
ISSN号	00134686
DOI	10.1016/j.electacta.2020.137475
英文摘要	Activated carbon (AC) is a multifunctional material. On the one hand, it is used as adsorbent to remove pollutants in wastewater, on the other hand, it is a preferred electrode for supercapacitors. Herein, we fabricate a hybrid electrode based on Co(OH)2 and waste AC which is supposed to discard after removing methylene blue (MB) from water. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy demonstrate AC/MB/Co(OH)2 nanocomposites are successfully synthesized via precipitation method. Furthermore, the specific surface area of AC/MB/Co(OH)2 is dramatically improved compared to Co(OH)2. Cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectrum (EIS) tests suggest that the specific capacity of AC/MB/Co(OH)2 is 447 C g-1 at a current density of 1 A g-1 in 3M KOH, which is higher than that of Co(OH)2 (329 C g-1) or AC/Co(OH)2 (347 C g-1). The result indicates that MB adsorbed on AC can provide pseudo-capacity for the hybrid electrode. The assembled asymmetric supercapacitor has a power density of 400 W kg-1 at an energy density of 18 Wh kg-1 and can power a light emitting diodes (LED) easily. Thus, this strategy makes it possible to further use waste AC as the electrode of supercapacitor, which avoids secondary pollution that comes from the adsorbents. © 2020
WOS研究方向	Electrochemistry
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000607621100004
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/147188]
专题	石油化工学院
作者单位	College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Xu, Cheng,Chen, Yong,Ma, Yannan,et al. Waste activated carbon transformed to electrode of supercapacitor through combining with Co(OH)2[J]. Electrochimica Acta,2021,367.
APA	Xu, Cheng,Chen, Yong,Ma, Yannan,Huang, Jiandi,Zhao, Jiang,&Xu, Hui.(2021).Waste activated carbon transformed to electrode of supercapacitor through combining with Co(OH)2.Electrochimica Acta,367.
MLA	Xu, Cheng,et al."Waste activated carbon transformed to electrode of supercapacitor through combining with Co(OH)2".Electrochimica Acta 367(2021).