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Cobalt Selenide Nanostructures: An Efficient Bifunctional Catalyst with High Current Density at Low Coverage.

Jahangir Masud1, Abdurazag T Swesi1, Wipula P R Liyanage1

  • 1Department of Chemistry, Missouri S&T , Rolla, Missouri 65409, United States.

ACS Applied Materials & Interfaces
|June 17, 2016
PubMed
Summary

Electrodeposited cobalt selenide (Co7Se8) nanostructures demonstrate excellent bifunctional catalytic activity for both oxygen and hydrogen evolution reactions in alkaline solutions. These nanostructures offer high efficiency and durability for water electrolysis applications.

Keywords:
Co7Se8OERORRtransition metal chalcogenideswater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing efficient and durable electrocatalysts is crucial for sustainable energy technologies like water electrolysis.
  • Transition metal chalcogenides are promising alternatives to precious metal catalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).
  • Cobalt selenides (Co7Se8) have shown potential but require optimization for enhanced catalytic performance.

Purpose of the Study:

  • To synthesize and characterize electrodeposited Co7Se8 nanostructures for bifunctional OER and HER catalysis.
  • To investigate the effect of nanostructure morphology and patterning on catalytic activity.
  • To evaluate the long-term durability and efficiency of Co7Se8 catalysts in alkaline media.

Main Methods:

  • Electrodeposition of Co7Se8 nanostructures with flake-like morphology.
  • Confined electrodeposition on lithographically patterned nanoelectrodes to create 3D rod-like and tubular structures.
  • Electrochemical characterization including cyclic voltammetry, linear sweep voltammetry, and chronoamperometry in alkaline electrolyte.
  • Investigation of substrate effects on catalytic activity.

Main Results:

  • Co7Se8 nanostructures exhibited bifunctional catalytic activity for OER and HER with high Faradaic efficiency (99.62%) and long-term durability (>12 h).
  • Co7Se8 demonstrated low overpotential (0.26 V at 10 mA cm⁻²) for OER and low Tafel slopes for both OER (32.6 mV dec⁻¹) and HER (59.1 mV dec⁻¹).
  • Patterned 3D Co7Se8 nanostructures achieved exceptionally high mass activity (∼68,000 A g⁻¹), significantly outperforming planar films.

Conclusions:

  • Electrodeposited Co7Se8 nanostructures are highly effective bifunctional electrocatalysts for water splitting in alkaline media.
  • Morphological control and 3D nanostructure patterning significantly enhance catalytic performance and mass activity.
  • Co7Se8 offers a promising, cost-effective alternative to precious metal catalysts for electrochemical applications.