Potato starch-based activated carbon spheres as electrode material for electrochemical capacitor

Potato starch-based activated carbon spheres (PACS) were prepared from potato starch by stabilization, carbonization followed by activation with KOH. The obtained PACS are hollow and retain the original morphology of potato starch with decrease in size, as shown by scanning electron microscopy. Modi...

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Published in	The Journal of physics and chemistry of solids Vol. 70; no. 9; pp. 1256 - 1260
Main Authors	Zhao, Shuo, Wang, Cheng-Yang, Chen, Ming-Ming, Wang, Jin, Shi, Zhi-Qiang
Format	Journal Article
Language	English
Published	Kidlington Elsevier Ltd 01.09.2009 Elsevier
Subjects	A. Microporous materials Chemistry D. Electrochemical properties D. Microstructure Electrochemistry Electrodes: preparations and properties Exact sciences and technology General and physical chemistry D. Microstructure A. Microporous materials D. Electrochemical properties Scanning electron microscopy Adsorption isotherm Electrolytic capacitor Electrode material Porous material Texture Cyclic voltammetry Electrochemical properties Activated carbon Plant origin Capacitance Microstructure
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ISSN	0022-3697 1879-2553
DOI	10.1016/j.jpcs.2009.07.004

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Abstract	Potato starch-based activated carbon spheres (PACS) were prepared from potato starch by stabilization, carbonization followed by activation with KOH. The obtained PACS are hollow and retain the original morphology of potato starch with decrease in size, as shown by scanning electron microscopy. Modification of textural properties of the PACS was achieved by varying the carbonization temperature and the ratio of KOH/PCS. The results of N 2 adsorption isotherms indicate that the samples prepared are mainly microporous. The electrochemical behaviors of the hollow PACS were studied by galvanostatic charge–discharge, cyclic voltammetry, and impedance spectroscopy. The results indicate that high specific capacitance of 335 F/g is obtained at current density 50 mA/g for PACS with specific surface area 2342 m 2/g. Only a slight decrease in capacitance, to 314 F/g, was observed when the current density increases to 1000 mA/g, indicating a stable electrochemical property.
AbstractList	Potato starch-based activated carbon spheres (PACS) were prepared from potato starch by stabilization, carbonization followed by activation with KOH. The obtained PACS are hollow and retain the original morphology of potato starch with decrease in size, as shown by scanning electron microscopy. Modification of textural properties of the PACS was achieved by varying the carbonization temperature and the ratio of KOH/PCS. The results of N 2 adsorption isotherms indicate that the samples prepared are mainly microporous. The electrochemical behaviors of the hollow PACS were studied by galvanostatic charge–discharge, cyclic voltammetry, and impedance spectroscopy. The results indicate that high specific capacitance of 335 F/g is obtained at current density 50 mA/g for PACS with specific surface area 2342 m 2/g. Only a slight decrease in capacitance, to 314 F/g, was observed when the current density increases to 1000 mA/g, indicating a stable electrochemical property.
Author	Wang, Jin Chen, Ming-Ming Zhao, Shuo Shi, Zhi-Qiang Wang, Cheng-Yang
Author_xml	– sequence: 1 givenname: Shuo surname: Zhao fullname: Zhao, Shuo – sequence: 2 givenname: Cheng-Yang surname: Wang fullname: Wang, Cheng-Yang email: cywang@tju.edu.cn – sequence: 3 givenname: Ming-Ming surname: Chen fullname: Chen, Ming-Ming – sequence: 4 givenname: Jin surname: Wang fullname: Wang, Jin – sequence: 5 givenname: Zhi-Qiang surname: Shi fullname: Shi, Zhi-Qiang
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Keywords	D. Microstructure A. Microporous materials D. Electrochemical properties Scanning electron microscopy Adsorption isotherm Electrolytic capacitor Electrode material Porous material Texture Cyclic voltammetry Electrochemical properties Activated carbon Plant origin Capacitance Microstructure
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Snippet	Potato starch-based activated carbon spheres (PACS) were prepared from potato starch by stabilization, carbonization followed by activation with KOH. The...
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StartPage	1256
SubjectTerms	A. Microporous materials Chemistry D. Electrochemical properties D. Microstructure Electrochemistry Electrodes: preparations and properties Exact sciences and technology General and physical chemistry
Title	Potato starch-based activated carbon spheres as electrode material for electrochemical capacitor
URI	https://dx.doi.org/10.1016/j.jpcs.2009.07.004
Volume	70
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