Combined electrochemical and DFT investigations of iron selenide: A mechanically bendable solid-state symmetric supercapacitor Articles uri icon

authors

  • PANDIT, BIDHAN
  • RONDIYA, SACHIN R.
  • SHEGOKAR, SHYAMAL
  • BOMMINEEDI, KAKSHMANA KUMAR
  • CROSS, RUSSELL W.
  • DZADE, NELSON Y.
  • SANKAPAL, BABASAHEB R.

publication date

  • January 2021

start page

  • 5001

end page

  • 5012

issue

  • 19

volume

  • 5

International Standard Serial Number (ISSN)

  • 2398-4902

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.

subjects

  • Chemistry

keywords

  • high-performance; electrode material; energy density; graphene oxide; fese2; microspheres; nanoparticles; nanosheets; composite; films