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1D-CoSe2 nanoarray: a designed structure for efficient hydrogen evolution and symmetric supercapacitor

Iqra Rabani1, Sajjad Hussain2, Dhanasekaran Vikraman3

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This study presents 1D-Cobalt Diselenide (CoSe2) nanoarrays synthesized on titanium foil for efficient energy applications. These nanoarrays demonstrate excellent performance in hydrogen evolution reactions and supercapacitors, offering a new pathway for advanced energy devices.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Direct growth of one-dimensional (1D) nanorod arrays on conductive substrates is crucial for electrocatalysis.
  • Unique nanoscale properties of 1D nanostructures enhance catalytic and electrochemical performance.

Purpose of the Study:

  • To synthesize 1D-Cobalt Diselenide (CoSe2) nanoarrays on titanium foil using a facile two-step method.
  • To evaluate the synthesized 1D-CoSe2 nanoarrays as electrode materials for hydrogen evolution reaction (HER) and supercapacitors.

Main Methods:

  • A two-step wet chemical ion-exchange approach was used for synthesizing 1D-CoSe2 nanoarrays on Ti foil.
  • Electrochemical characterization was performed to assess HER activity and supercapacitor performance.

Main Results:

  • Optimized 1D-CoSe2 nanoarrays exhibited excellent HER properties, including a low Tafel slope (78 mV dec-1) and low overpotentials (41 mV@1 mA cm-2).
  • The material demonstrated robust HER performance for 25 hours and achieved a specific capacitance of 152 F g-1 in a symmetric supercapacitor device.
  • The supercapacitor device showed good stability with ~96.8% capacity retention after 5000 cycles and an energy density of 21.1 W h kg-1.

Conclusions:

  • The synthesized 1D-CoSe2 nanoarrays are promising electrode materials for both hydrogen evolution and energy storage applications.
  • The facile synthesis method provides a new avenue for developing high-performance, stable energy devices.
  • Direct growth of nanostructured materials on conductive substrates offers significant advantages for electrocatalysis.