A high voltage solid state symmetric supercapacitor based on graphene-polyoxometalate hybrid electrodes with a hydroquinone doped hybrid gel-electrolyte
Dubal, Deepak P. (Institut Català de Nanociència i Nanotecnologia)
Suarez-Guevara, Jullieth (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)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)

Data:	2015
Resum:	In pursuit of high capacitance and high energy density storage devices, hybrid materials have quickly garnered well-deserved attention based on their power to merge complementary components and properties. Here, we report the fabrication of all-solid state symmetric supercapacitors (ASSSC) based on a double hybrid approach combining a hybrid electrode (reduced graphene oxide-phoshomolybdate, rGO-PMo) and a hybrid electrolyte (hydroquinone doped gel-electrolyte). To begin with, a high-performance hybrid electrode based on HPMoO nanodots anchored onto rGO was prepared (rGO-PMo). Later, an all-solid state symmetric cell based on these rGO-PMo electrodes, and making use of a polymer gel-electrolyte was assembled. This symmetric cell showed a significant improvement in cell performance. Indeed, it allowed for an extended potential window by 0. 3 V that led to an energy density of 1. 07 mW h cm. Finally, we combined these hybrid electrodes with a hybrid electrolyte incorporating an electroactive species. This is the first proof-of-design where a redox-active solid-state gel-electrolyte is applied to rGO-PMo hybrid supercapacitors to accomplish a significant enhancement in the capacitance. Strikingly, a further excellent increase in the device performance (energy density of 1. 7 mW h cm) was realized with the hybrid electrode-hybrid electrolyte combination cell as compared to that of the conventional electrolyte cell. Thus, this unique symmetric device outclasses the high-voltage asymmetric counterparts under the same power and represents a noteworthy advance towards high energy density supercapacitors.
Ajuts:	Ministerio de Economía y Competitividad MAT2012-39199-C02-01 Ministerio de Economía y Competitividad SEV-2013-0295
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Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Device performance ; Electroactive species ; Electrolyte cells ; High energy densities ; Hybrid electrolytes ; Hybrid supercapacitors ; Polymer gel electrolytes ; Reduced graphene oxides
Publicat a:	Journal of materials chemistry. A, Vol. 3, Issue 46 (December 2015) , p. 23483-23492, ISSN 2050-7496

DOI: 10.1039/c5ta05660h

Postprint 27 p, 1.5 MB

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