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Pàgina inicial > Articles > Articles publicats > Controlling the electrochemical hydrogen generation and storage in graphene oxide by in-situ Raman spectroscopy |
Data: | 2022 |
Resum: | Hydrogen, generated from water splitting, is postulated as one of the most promising alternatives to fossil fuels. In this context, direct hydrogen generation by electrolysis and fixation to graphene oxide in an aqueous suspension could overcome storage and distribution problems of gaseous hydrogen. This study presents time-resolved determination of the electrochemical hydrogenation of GO by in-situ Raman spectroscopy, simultaneous to original functional groups elimination. Hydrogenation is found favoured by dynamic modulation of the electrochemical environment compared to fixed applied potentials, with a 160% increase of C-H bond formation. Epoxide groups suppression and generated hydroxide groups point at these epoxide groups being one of the key sites where hydrogenation was possible. FTIR revealed characteristic symmetric and asymmetric stretching vibrations of C-H bonds in CH and CH groups. This shows that hydrogenation is significantly also occurring in defective sites and edges of the graphene basal plane, rather than H-Csp groups as graphane. We also determined a −0. 05 V reduction starting potential in alkaline electrolytes and a 150 mV cathodic delay in acid electrolytes. The identified key parameters role, together with observed diverse C-H groups formation, points at future research directions for large-scale hydrogen storage in graphene. |
Ajuts: | European Commission 952068 European Commission 754558 Agencia Estatal de Investigación CEX2019-000910-S Agencia Estatal de Investigación PGC2018-101743-B-I00 Agencia Estatal de Investigación SEV-2017-0706 Ministerio de Ciencia e Innovación FJC2020-043223-I Ministerio de Ciencia e Innovación CEX2019-000910-S |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Matèria: | Hydrogen storage ; Energy storage ; Electrochemical reduction ; Hydrogenation ; Graphene oxide ; Reduced graphene oxide |
Publicat a: | Carbon, Vol. 200 (Nov. 2022) , p. 227-235, ISSN 0008-6223 |
9 p, 5.8 MB |