Wide electrochemical window of supercapacitors from coffee bean-derived phosphorus-rich carbons

Huang, Congcong, Sun, Ting and Hulicova-Jurcakova, Denisa (2013) Wide electrochemical window of supercapacitors from coffee bean-derived phosphorus-rich carbons. ChemSusChem, 6 12: 2330-2339. doi:10.1002/cssc.201300457

Author Huang, Congcong
Sun, Ting
Hulicova-Jurcakova, Denisa
Title Wide electrochemical window of supercapacitors from coffee bean-derived phosphorus-rich carbons
Journal name ChemSusChem   Check publisher's open access policy
ISSN 1864-5631
Publication date 2013-01-01
Sub-type Article (original research)
DOI 10.1002/cssc.201300457
Open Access Status Not yet assessed
Volume 6
Issue 12
Start page 2330
End page 2339
Total pages 10
Place of publication Weinheim, Germany
Publisher Wiley - V C H Verlag
Language eng
Abstract Phosphorus-rich carbons (PCs) were prepared by phosphoric acid activation of waste coffee grounds in different impregnation ratios. PCs were characterized by nitrogen and carbon dioxide adsorption and X-ray photoelectron spectroscopy. The results indicate that the activation step not only creates a porous structure, but also introduces various phosphorus and oxygen functional groups to the surface of carbons. As evidenced by cyclic voltammetry, galvanostatic charge/discharge, and wide potential window tests, a supercapacitor constructed from PC-2 (impregnation ratio of 2), with the highest phosphorus content, can operate very stably in 1 M H2SO4 at 1.5V with only 18 % degradation after 10 000cycles at a current density of 5A g-1. Due to the wide electrochemical window, a supercapacitor assembled with PC-2 has a high energy density of 15Wh kg-1 at a power density of 75W kg -1. The possibility of widening the potential window above the theoretical potential for the decomposition of water is attributed to reversible electrochemical hydrogen storage in narrow micropores and the positive effect of phosphorus-rich functional groups, particularly the polyphosphates on the carbon surface. Rich pick-me-up! Waste coffee grounds are used to synthesize phosphorus-rich carbons (PCs), which show intriguing properties as electrode materials of an acidic supercapacitor. Large potentials can be applied, owing to the stabilizing effect of phosphorus on the carbon surface and reversible electrochemical hydrogen storage in pores of the PC. Copyright
Keyword Biomass
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
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