Electrical double-layer capacitors(EDLCs)consist of energy storage devices that present high-power and moderate energy density.The electrolyte and electrode physicochemical properties are crucial for improving their overall energy storage capabilities.Therefore,the stability of the EDLCs'materials is the primary focus of this study.Since energy storage depends on the specific capacitance,and also on the square of the maximum capacitive cell voltage(UMcv).Thus,electrodes with high specific surface area(SSA)and electrolytes with excellent electrochemical stability are commonly reported in the literature.Aqueous electrolytes are safer and green devices compared to other organic-based solutions.On the other hand,their UMcv is reduced compared to other electrolytes(e.g.,organic-based and ionic liquids).In this sense,spanning the UMCV for aqueous-based electrolytes is a'hot topic'research.Unfortunately,the lack of protocols to establish reliable UMCv values has culminated in the publishing of several conflicting results.Herein,we confirm that multiwalled carbon nanotubes(MWCNTs)housed in cells degrade and produce CO2 under abusive polarisation conditions.It is probed by employing electrochemical tech-niques,in-situ FTIR and in-situ Raman spectroscopies.From these considerations,the current study uses spectro-electrochemical techniques to support the correct determination of the electrode and electrolyte stability conditions as a function of the operating electrochemical parameters.

Advanced Energy Storage Division,State University of Campinas,13083-852,Av.Albert Einsten 400,Campinas,SP,Brazil;Chemistry Institute,State University of Campinas,13083-970,Josue de Castro Street,Campinas,SP,Brazil;Center for Innovation on New Energies,University of Campinas,13083-841 Campinas,S?o Paulo,Brazil;Department of Chemistry,Laboratory of Fundamental and Applied Electrochemistry,Federal University of Jequitinhonha and Mucuri's Valley,Rodovia MGT 367,km 583,5000,Alto da Jacuba,39100-000,Diamantina,MG,Brazil

[1]Murilo M.Amaral;Victor Y.Yukuhiro;Rafael Vicentini;Alfredo C.Peterlevitz;Leonardo M.Da Silva;Pablo Fernandez;Hudson Zanin-.Direct observation of the CO2 formation and C-H consumption of carbon electrode in an aqueous neutral electrolyte supercapacitor by in-situ FTIR and Raman)[J].能源化学,2022(08):488-496

UMcv,UMCV,UMCv,culminated,abusive

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