A novel strategy to achieve 2V symmetric supercapacitor using B, N doped rGO as an electrode material in "water in salt based hydrous electrolyte". (20th August 2021)

• Record Type: Journal Article
• Authors: Samanta, Prakas; Ghosh, Souvik; Shit, Subhasis; Landge, Bhau; Mandal, Sanjib Kumar; Sinha, Sangam; Dutta, Gour Gopal; Kuila, Tapas
• Is Part Of: Electrochimica acta. Volume 388(2021)
• Publication Date: 2021-08-20
• Subjects: Reduced graphene oxide -- Aqueous electrolyte -- Supercapacitors -- High potential window; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.138571
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Lewis acid/base element enhances electrochemical properties of rGO layers. Individual Lewis acid/base element (B, N) doped rGO showed different electrochemical activity. High electrochemical potential window was obtained using hydrous aqueous electrolyte. 2 V symmetric supercapacitors can achieve using hydrous aqueous electrolyte. Abstract: Design of solid-state symmetric supercapacitors (SSCs) with superior power density, energy density and long cycle life using carbonaceous electrode materials in aqueous electrolyte media remains a great challenge. A high working potential window of SSC-based on aqueous electrolyte can be achieved by "trapping" free water molecules. Herein, the Lewis acid/base characteristic of B & N-doped reduced graphene oxide was synthesized through hydrothermal process and utilized for solid-state SSC fabrication. A solid-state electrolyte composed of polyethylene glycol (PEG) as water trapping agent and sodium dodecyl sulfate as ionic conductivity improving agent are used for solid-state SSC fabrication. The ethylene oxide unit of PEG polymer chains tightly binds the free water molecules and provides thermodynamic stability. This hydrous electrolyte offers ~2 V electrochemical potential windows to the SSC device which is greater than the normal aqueous electrolyte. The SSC device based on hydrous electrolyte showed maximum ~10.58 kW kg −1 power density and ~43.33 W h kg −1 energy density. In addition, the superior life cycle of ~97.85% specific capacitance retention was obtained after 10, 000 continuous charge/discharge cycles at 5 A g −1 current density. Graphical abstract: Image, graphical abstract