CNR ExploRA

Articolo in rivista, 2023, ENG, 10.1002/celc.202300161

Graphene Doped Carbon-Gels and MnO2 for Next Generation of Solid-State Asymmetric Supercapacitors

Dr. Natalia Rey-Raap1, Dr. Samantha L. Flores-López1, Dr. Lucia dos Santos-Gómez2, Mr. Antonino Brigandì3, Dr. Minju Thomas3, Dr. Prof. A.E Stoyanova4, Dr. Francesco Lufrano3*, Prof. Dr. Ana Arenillas1

1 Instituto de Ciencia y Tecnología del Carbono (INCAR), CSIC, 33011 Oviedo, Spain 2 Universidad de Málaga, Dpto. de Química Inorgánica, Cristalografía y Mineralogía, 29071 Málaga, Spain 3 Istituto di Tecnologie Avanzate per L´Energia "Nicola Giordano", CNR-ITAE, 98126 Messina, Italy 4 Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, BG-1113 Sofia, Bulgaria

Supercapacitors are playing a very relevant role in many applications due to their capability to supply high power density and long durability. However, there is a growing demand to increase their energy density, in gravimetric and volumetric basis. There are different strategies to increase supercapacitor performance by improving the active materials used in the electrodes, the type of electrolyte used or even the configuration employed in the cell. In this work, a combination of these strategies is presented with the use of different active materials, electrolytes and symmetric vs asymmetric configuration. The supercapacitor with asymmetric configuration using the graphene-doped carbon xerogel in the negative electrode and the manganese oxide in the positive electrode, along with the use of Na+-form Aquivion electrolyte membrane as solid electrolyte, seems to be a promising combination to obtain a substantial enhancement of both gravimetric and volumetric capacitance. Furthermore, the device presents great stability in a wide operational voltage window from 0 to 1.8 V and with a neutral pH polymer electrolyte which contributes to improve the performance, safety and long cycle life of the device.

ChemElectroChem Volume 10 (24)