New insights on electrochemical hydrogen storage in nanoporous carbons by in situ Raman spectroscopy

Please use this identifier to cite or link to this item: http://hdl.handle.net/10045/44750
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Title: New insights on electrochemical hydrogen storage in nanoporous carbons by in situ Raman spectroscopy
Authors: Leyva García, Sarai | Morallon, Emilia | Cazorla-Amorós, Diego | Béguin, François | Lozano Castelló, Dolores
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: In situ Raman spectroscopy | Electrochemical hydrogen storage | Nanoporous carbons
Knowledge Area: Química Inorgánica | Química Física
Issue Date: Apr-2014
Publisher: Elsevier
Citation: Carbon. 2014, 69: 401-408. doi:10.1016/j.carbon.2013.12.042
Abstract: In situ Raman spectroscopy was exploited to analyze the interaction between carbon and hydrogen during electrochemical hydrogen storage at cathodic conditions. Two different activated carbons were used and characterized by different electrochemical techniques in two electrolytes (6 M KOH and 0.5 M Na2SO4). The in situ Raman spectra collected showed that, in addition to the D and G bands associated to the graphitic carbons, two bands appear simultaneously at about 1110 and 1500 cm−1 under cathodic conditions, and then they disappear when the potential increases to more positive values. This indicates that carbon–hydrogen bonds are formed reversibly in both electrolytes during cathodic conditions. Comparing the two activated carbons, it was confirmed that, in both electrolytes, the hydrogenation of carbon atoms is produced more easily for the sample with lower amount of surface oxygen groups. In KOH medium, for the two samples, the formation of carbon–hydrogen bonds proceeds at more positive potential with respect to the thermodynamic potential value for hydrogen evolution. Furthermore, changes in the shape of the D band (due to an intensity increase of the D1 band) during the formation of carbon–hydrogen bonds suggest that hydrogenation of the carbon atoms increases the number of edge planes.
Sponsor: The authors would like to thank the Spanish Ministerio de Economía y Competitividad and FEDER funds (Projects CTQ2012-31762 and MAT2010-15273) and Generalitat Valenciana and FEDER (PROMETEO/2009/047) for financial support. SLG thanks: Vicerrectorado de Investigación, Desarrollo e Innovación of the University of Alicante for a Fellowship for research initiation and Generalitat Valenciana and FEDER for a fellowships for training of researchers. F.B. acknowledges the support of the Foundation for Polish Science within the WELCOME program (ECOLCAP project).
URI: http://hdl.handle.net/10045/44750
ISSN: 0008-6223 (Print) | 1873-3891 (Online)
DOI: 10.1016/j.carbon.2013.12.042
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2013 Elsevier Ltd.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.carbon.2013.12.042
Appears in Collections:INV - GEPE - Artículos de Revistas
INV - MCMA - Artículos de Revistas

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