Combined electrochemical and DFT investigations of iron selenide: a mechanically bendable solid-state symmetric supercapacitor

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.

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Work Title Combined electrochemical and DFT investigations of iron selenide: a mechanically bendable solid-state symmetric supercapacitor
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Open Access
Creators
  1. Bidhan Pandit
  2. Sachin R. Rondiya
  3. Shyamal Shegokar
  4. Lakshmana Kumar Bommineedi
  5. Russell W. Cross
  6. Nelson Y. Dzade
  7. Babasaheb R. Sankapal
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Sustainable Energy and Fuels
Publication Date October 7, 2021
Publisher Identifier (DOI)
  1. https://doi.org/10.1039/d1se00074h
Deposited January 13, 2022

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Version 1
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  • Created
  • Added Final-Manuscript-iron_selenide_supercapacitor.docx
  • Added Creator Bidhan Pandit
  • Added Creator Sachin R. Rondiya
  • Added Creator Shyamal Shegokar
  • Added Creator Lakshmana Kumar Bommineedi
  • Added Creator Russell W. Cross
  • Added Creator Nelson Y. Dzade
  • Added Creator Babasaheb R. Sankapal
  • Published
  • Updated
  • Updated