Jisha, M.R. and Hwanga, Y.J. and Shin, J.S. and Nahm, K.S. and Premkumar, T. and Karthikeyan, K. and Dhanikaivelu, N. and Kalpana, D. and Renganathan, N.G. and Stephan, A.M. (2009) Electrochemical characterization of supercapacitors based on carbons derived from coffee shells. Materials Chemistry and Physics, 115 (1). pp. 33-39. ISSN 0254-0584

PDF Restricted to Registered users only Download (1099Kb) | Request a copy

Abstract

Carbons derived by pyrolysis of coffee shells treated with ZnCl2 were used as electrode materials in symmetric electrochemical supercapacitors. Scanning electron microscopy showed that the carbon from the porogen-free shells showa flake-like structure, while those fromthe ZnCl2-treated coffee shells have a loose, disjointed structure with no definite shape. X-ray diffraction studies indicated the presence of small domains of coherent and parallel stacking of the graphene sheets. The average surface area of the carbon was 842m2 g−1, with an average micropore area of 400m2 g−1. Cyclic voltammetric studies suggested a specific capacitance of about 150 F g−1. Self-discharge studies on the devices showed a large retention time.

Item Type:	Article
Uncontrolled Keywords:	Supercapacitors; Carbon; Porogen; Coffee shells; Chemical activations
Subjects:	Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	TTBD CECRI
Date Deposited:	01 Apr 2012 17:27
Last Modified:	10 Oct 2012 12:59
URI:	http://cecri.csircentral.net/id/eprint/676

Actions (login required)

View Item