Ultrahigh energy density supercapacitors through a double hybrid strategy
Dubal, Deepak P. (Institut Català de Nanociència i Nanotecnologia)
Nagar, Bhawna (Institut Català de Nanociència i Nanotecnologia)
Suárez Guevara, Jullieth Gabriela (Institut Català de Nanociència i Nanotecnologia)
Tonti, Dino (Institut de Ciència de Materials de Barcelona)
Enciso, Eduardo (Universidad Complutense de Madrid. Departamento de Química Física)
Palomino, Pablo (Universidad Complutense de Madrid. Departamento de Química Física)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)

Date:	2017
Abstract:	Herein, we are presenting all-solid-state symmetric supercapacitors (ASSSCs) with an innovative double hybrid strategy, where a hybrid material based on reduced graphene oxide (rGO) anchored with phoshotungstic acid, rGO-HPWO) is combined with hybrid electrolyte (hydroquinone-doped gel electrolyte). Initially, a hybrid electrode is fabricated by decorating HPWO nanodots onto the surface rGO (rGO-PW). Next, a symmetric cell based on rGO-PW electrodes was assembled with PVA-HSO polymer gel-electrolyte. Interestingly, rGO-PW symmetric cell revealed a substantial enhancement in the cell performance as compared to parent rGO systems. It featured a widened potential range of 1. 6 V, thereby providing 1. 05 mWh/cm energy density. The electrochemical performance of rGO-PW cell was further advanced by introducing redox-active (hydroquinone) species in to the PVA-HSO gel-electrolyte. Indeed, the performance of rGO-PW cell was surprisingly improved with an ultra-high energy density of 2. 38 mWh/cm (more than two-fold).
Grants:	Ministerio de Economía y Competitividad MAT2015-68394-R Ministerio de Economía y Competitividad SEV-2013-0295
Rights:	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.
Language:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Subject:	Reduced graphene oxide-phosphotungstate hybrid ; Hydroquinoe-doped gel electrolyte ; Symmetric supercapacitors ; Ultrahigh energy density
Published in:	Materials today energy, Vol. 5 (September 2017) , p. 58-65, ISSN 2468-6069

DOI: 10.1016/j.mtener.2017.05.001

Preprint 44 p, 6.2 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles