Combined electrochemical and DFT investigations of iron selenide: a mechanically bendable solid-state symmetric supercapacitor. Issue 19 (7th September 2021)

• Record Type: Journal Article
• Authors: Pandit, Bidhan; Rondiya, Sachin R.; Shegokar, Shyamal; Bommineedi, Lakshmana Kumar; Cross, Russell W.; Dzade, Nelson Y.; Sankapal, Babasaheb R.
• Is Part Of: Sustainable energy & fuels. Volume 5:Issue 19(2021)
• Page Start: 5001
• Page End: 5012
• Publication Date: 2021-09-07
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/d1se00074h
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : Graphene analogous nanoflakes morphology of iron selenide for advanced flexible solid-state symmetric supercapacitor. Abstract : Enhancing energy storing capability with the aid of unique nanostructured morphologies is beneficial for the development of high performance supercapacitors. Developing earth abundant and low-cost transition metal selenides (TMSs) with enhanced charge transfer capabilities and good stability is still a challenge. Herein, state of the art for iron selenide with a nanoflake surface architecture, synthesized with the aid of a simple, industry-scalable and ionic layer controlled chemical approach, namely the successive ionic layer adsorption and reaction (SILAR) method, is presented. The iron selenide electrode yields a capacitance of 671.7 F g −1 at 2 mV s −1 scan rate and 434.6 F g −1 at 2 mA cm −2 current density through cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) studies, respectively, with 91.9% cyclic retention at 4000 cycles. The developed bendable solid-state supercapacitor reveals a remarkable power density of 5.1 kW kg −1 with outstanding deformation tolerance, including its use in a practical demo to run a small fan, demonstrating its capability for advanced energy storage applications. A complementary first-principles density functional theory (DFT) approach is used in combination with the experimental supercapacitive performance to achieve an understanding of the electronic structure.