Electrochemical behaviour of activated carbons obtained via hydrothermal carbonization

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Title: Electrochemical behaviour of activated carbons obtained via hydrothermal carbonization
Authors: Salinas Torres, David | Lozano Castelló, Dolores | Titirici, Maria-Magdalena | Zhao, Li | Yu, Linghui | Morallon, Emilia | Cazorla-Amorós, Diego
Research Group/s: Materiales Carbonosos y Medio Ambiente | Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Activated carbons | Electrochemical behaviour | Hydrothermal carbonization
Knowledge Area: Química Inorgánica | Química Física
Issue Date: 18-Jun-2015
Publisher: Royal Society of Chemistry
Citation: Journal of Materials Chemistry A. 2015, 3: 15558-15567. doi:10.1039/C5TA03574K
Abstract: Activated carbons were prepared by chemical activation of hydrochars, obtained by hydrothermal carbonisation (HTC) using low cost and abundant precursors such as rye straw and cellulose, with KOH. Hydrochars derived from rye straw were chemically activated using different KOH/precursor ratios, in order to assess the effect of this parameter on their electrochemical behaviour. In the case of cellulose, the influence of the hydrothermal carbonisation temperature was studied by fixing the activating agent/cellulose ratio. Furthermore, N-doped activated carbons were synthesised by KOH activation of hydrochars prepared by HTC from a mixture of glucose with melamine or glucosamine. In this way, N-doped activated carbons were prepared in order to evaluate the influence of nitrogen groups on their electrochemical behaviour in acidic medium. The results showed that parameters such as chemical activation or carbonisation temperature clearly affect the capacitance, since these parameters play a key role in the textural properties of activated carbons. Finally, symmetric capacitors based on activated carbon and N-doped activated carbon were tested at 1.3 V in a two-electrode cell configuration and the results revealed that N-groups improved the capacitance at high current density.
Sponsor: The authors thank the Spanish MINECO, GV and FEDER (PROMETEOII/2014/010, Projects CTQ2012-31762 and MAT2013-42007-P) and D.S.T. is indebted to MINECO for a predoctoral FPI grant (BES-2010-035238). M. Titirici, Li Zhao and Linghui Yu would like to acknowledge financial support from the Max-Planck Society. Li Zhao is grateful to China Scholarship Council for awarding her a PhD fellowship in Germany.
URI: http://hdl.handle.net/10045/48593
ISSN: 2050-7488 (Print) | 2050-7496 (Online)
DOI: 10.1039/C5TA03574K
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Royal Society of Chemistry 2015
Peer Review: si
Publisher version: http://dx.doi.org/10.1039/C5TA03574K
Appears in Collections:INV - MCMA - Artículos de Revistas
INV - GEPE - Artículos de Revistas

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