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Enhanced Supercapattery Performance Enabled by Nitrogen-Doped Nb2O5 Nanostructures.

Fernando José Soares Barros1,2, Samuel da Silva Eduardo3, Klebson Lucas Pereira Cardozo1

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Nitrogen doping enhances niobium oxide (Nb_N) for energy storage. This modified material shows improved battery-type electrode behavior and stability in supercapatteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Nitrogen doping is a key strategy to improve the electrochemical performance of transition metal oxides.
  • Niobium oxide (Nb2O5) is a promising material for energy storage applications.

Purpose of the Study:

  • To synthesize nitrogen-doped niobium oxide (Nb_N) using urea as a precursor.
  • To investigate the structural, compositional, and electrochemical properties of Nb_N.
  • To evaluate the performance of Nb_N in a supercapattery device.

Main Methods:

  • Thermal treatment with urea for nitrogen doping.
  • X-ray Photoelectron Spectroscopy (XPS) and Raman spectroscopy for material characterization.
  • Cyclic voltammetry and galvanostatic charge-discharge tests for electrochemical evaluation.
  • Assembly and testing of a supercapattery device.

Main Results:

  • Successful nitrogen incorporation into niobium oxide without phase changes, leading to improved crystallinity and larger crystallites.
  • XPS analysis revealed increased oxygen vacancies, and Raman analysis indicated local lattice distortion in Nb_N.
  • Nb_N exhibited higher specific capacity (1297.37 C g⁻¹) compared to undoped niobium oxide (1108.75 C g⁻¹) at 1 A g⁻¹.
  • The supercapattery using Nb_N delivered high energy (496.65 Wh kg⁻¹) and power densities (2771.99 W kg⁻¹), with excellent cycling stability over 5000 cycles.

Conclusions:

  • Nitrogen doping significantly enhances the structural and electronic properties of niobium oxide.
  • Nb_N demonstrates improved pseudocapacitive behavior, making it suitable for high-performance supercapatteries.
  • The developed nitrogen-doped niobium oxide offers a promising material for advanced energy storage solutions.