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Página principal > Artículos > Artículos publicados > Battery and supercapacitor materials in flow cells. Electrochemical energy storage in a LiFePO4/reduced graphene oxide aqueous nanofluid |
Fecha: | 2018 |
Resumen: | Exploring conceptual frontiers between batteries, supercapacitors, redox flow batteries (RFBs) and fuel cells (FCs), we have used a battery material (i. e. LiFePO) and a supercapacitor material (i. e. graphene) in the form of nanoparticles dispersed in an aqueous electrolyte to characterize the electrochemical activity of the resulting electroactive nanofluids. X-ray diffraction, TEM, Raman, XPS and AFM analyses were carried out to characterize the solid LiFePO and RGO components. The corresponding electroactive nanofluids were prepared by dispersion in an aqueous LiSO electrolyte and stabilized with Diaminobenzoic Acid (DABA). Cyclic voltammetry measurements were used to analyze their electrochemical behavior in three-electrode cells. Charge-discharge tests of the LiFePO/RGO (positive) vs. RGO (negative) nanofluids were also performed. Effective utilization of dispersed electroactive particles (ca. 100 mAh/g(LFP) at 1C) was demonstrated, which turned out to be superior to the same LFP material used as solid electrode. A charge-transfer percolation effect provided by the RGO dispersion is proposed as the mechanism for the good performance of LiFePO (not coated with carbon!) and RGO Nanofluids. Our results constitute a first step and proof of concept of the possible application of electroactive nanofluid electrodes in alternative flow batteries. |
Ayudas: | Ministerio de Economía y Competitividad MAT2015-68394-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-870 Ministerio de Economía y Competitividad SEV-2013-0295 |
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 acceptada per publicar |
Materia: | Electroactive nanofluids ; LiFePO4 ; Reduced graphene oxide |
Publicado en: | Electrochimica acta, Vol. 281 (August 2018) , p. 594-600, ISSN 1873-3859 |
Postprint 38 p, 1.3 MB |