In situ Raman analysis of reduced-graphene oxide-based electroactive nanofluids
Parpal, Monica (Universitat Autònoma de Barcelona. Departament de Química)
El Sachat, Alexandros (Institute of Nanoscience and Nanotechnology)
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)
Rueda García, Daniel (Institut Català de Nanociència i Nanotecnologia)
Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia)

Fecha:	2024
Resumen:	This study investigates the effect of an applied stationary voltage on the vibrational properties of 1 M HSO and HSO-based reduced-graphene oxide (rGO) nanofluids, commonly used as electrolytes in electrochemical cells. Our findings indicate that the energy of the symmetric stretching vibrations of HSO remains unaffected by the electric field. However, a slight deviation toward lower energy and an enhancement of Raman intensity are observed in the asymmetric stretching vibration of HSO due to the applied voltage. Furthermore, the addition of rGO to the base fluid produces a significant redshift in the symmetric stretching bands, indicating that the presence of rGO produces important changes at the macroscopic level in the base fluid. Synchronous and asynchronous maps further uncover the positive correlations between the D and G bands as well as between rGO and the base fluid bands. Specifically, the asynchronous map revealed complex dynamics between the rGO and HSO bands and only positive correlations between HSO bands. These results demonstrate the potential of Raman spectroscopy as a non-invasive technique to systematically study the influence of electric fields on the vibrational properties of fluids and nanofluids, which can ultimately lead to the development of significantly more efficient electrochemical cells.
Ayudas:	European Commission 101029727 European Commission 885689 Agencia Estatal de Investigación PID2021-128390OB-I00 Agencia Estatal de Investigación SEV-2017-0706
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Electroactive nanofluids ; Raman ; Stationary electric field ; R-GO nanofluids ; Two dimensional correlation maps
Publicado en:	Diamond and Related Materials, Vol. 141 (January 2024) , art. 110541, ISSN 1879-0062

DOI: 10.1016/j.diamond.2023.110541

7 p, 4.6 MB

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Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > Institut Català de Nanociència i Nanotecnologia (ICN2)
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