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Related Concept Videos

Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Enhanced Catalytic Activity of CuO@CuS Core-Shell Structure for Highly Efficient HER Application.

Abu Talha Aqueel Ahmed1, Sangeun Cho1, Hyunsik Im1

  • 1Division of System Semiconductor, Dongguk University, Seoul 04620, Republic of Korea.

Nanomaterials (Basel, Switzerland)
|December 17, 2024
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Summary

A novel nitrogen-doped CuO@CuS catalyst significantly enhances hydrogen evolution reaction (HER) performance. This cost-effective catalyst shows improved efficiency and stability for clean hydrogen fuel production.

Keywords:
CuSHERTOFcore–shellelectrocatalysthydrothermal growthnitrogen doping

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient, low-cost electrocatalysts for the hydrogen evolution reaction (HER) is crucial for clean energy applications.
  • Platinum-based catalysts are effective but expensive, hindering widespread adoption of hydrogen fuel production.
  • Heteroatom incorporation can modify catalyst properties like active sites, conductivity, and kinetics.

Purpose of the Study:

  • To synthesize and evaluate a novel nitrogen-doped CuO@CuS (NCOS) core-shell catalyst for the HER.
  • To investigate the impact of nitrogen doping on the structural and electrochemical properties of CuO@CuS catalysts.
  • To assess the catalytic activity, efficiency, and stability of the NCOS catalyst compared to pure CuS.

Main Methods:

  • Facile hydrothermal synthesis followed by nitrogenation to create the NCOS core-shell catalyst.
  • Systematic electrochemical analysis, including overpotential, Tafel slope, and chronopotentiometric testing.
  • Analysis of turnover frequency (TOF) and electrochemical impedance spectroscopy (EIS) to understand catalytic mechanisms.

Main Results:

  • The NCOS catalyst exhibited a significantly reduced overpotential (55 mV) and Tafel slope (107 mV dec⁻¹) compared to pure CuS (179 mV and 201 mV dec⁻¹).
  • Excellent stability was demonstrated over 50 hours of chronopotentiometric testing at various current densities.
  • Enhanced electron transfer rates and increased accessible active sites were observed due to nitrogen incorporation.

Conclusions:

  • Nitrogen doping effectively enhances the HER performance of CuO@CuS catalysts.
  • The NCOS core-shell structure offers a promising, cost-effective alternative to precious metal catalysts for hydrogen production.
  • The improved performance is attributed to enhanced electronic conductivity and structural modifications induced by nitrogen incorporation.