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Type: Journal article
Title: A high voltage solid state symmetric supercapacitor based on graphene-polyoxometalate hybrid electrodes with a hydroquinone doped hybrid gel-electrolyte
Author: Dubal, D.
Suarez-Guevara, J.
Tonti, D.
Enciso, E.
Gomez-Romero, P.
Citation: Journal of Materials Chemistry A, 2015; 3(46):23483-23492
Publisher: Royal Society of Chemistry
Issue Date: 2015
ISSN: 2050-7488
Statement of
Deepak P. Dubal, Jullieth Suarez-Guevara, Dino Tonti, Eduardo Enciso and Pedro Gomez-Romero
Abstract: 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–PMo₁₂) and a hybrid electrolyte (hydroquinone doped gel-electrolyte). To begin with, a high-performance hybrid electrode based on H₃PMo₁₂O₄₀ nanodots anchored onto rGO was prepared (rGO– PMo12). Later, an all-solid state symmetric cell based on these rGO–PMo₁₂ 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⁻³. 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–PMo₁₂ 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⁻³) 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.
Rights: This journal is © The Royal Society of Chemistry 2015
DOI: 10.1039/c5ta05660h
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