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High-Performance Ternary NiCoMo Electrocatalyst with Three-Dimensional Nanosheets Array Structure.

Zhihao Zhou1, Zhi Lu1,2, Shilin Li1

  • 1School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China.

Nanomaterials (Basel, Switzerland)
|November 11, 2022
PubMed
Summary
This summary is machine-generated.

Ternary NiCoMo-layered double hydroxide (LDH) nanosheet catalysts significantly enhance hydrogen production via water splitting. Doping molybdenum ions into NiCo-LDH improves electrocatalytic activity and lowers overpotential for efficient, low-cost hydrogen generation.

Keywords:
electrocatalysislayered double hydroxidenanosheetsoxygen evolution reaction

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Water splitting is crucial for hydrogen production, demanding efficient and cost-effective electrode materials.
  • Non-noble metal catalysts, specifically binary Nickel-Cobalt layered double hydroxides (NiCo-LDH), show promise but suffer from high overpotential.
  • Optimizing catalyst microstructure is key to improving electrocatalytic performance for the oxygen evolution reaction (OER).

Purpose of the Study:

  • To enhance the electrocatalytic activity of NiCo-LDH by doping molybdenum (Mo) ions.
  • To reduce the overpotential for the oxygen evolution reaction (OER) in water splitting.
  • To develop a cost-effective and high-performance electrode material for large-scale hydrogen production.

Main Methods:

  • Synthesis of ternary NiCoMo-layered double hydroxide (NiCoMo-LDH) nanosheet catalysts on Nickel Foam (NF) via ion doping.
  • Electrochemical characterization including overpotential measurements and Tafel slope analysis in 1 M KOH.
  • Microstructural analysis using electron microscopy to correlate structure with catalytic activity.

Main Results:

  • The NiCoMo-LDH/NF catalyst achieved a current density of 10 mA cm⁻² at a low potential of 1.5 V vs. RHE (≈270 mV overpotential).
  • A small Tafel slope of 81.46 mV dec⁻¹ was recorded, indicating efficient OER kinetics.
  • Microstructural analysis revealed interconnected nanosheet arrays that facilitate electrolyte diffusion and ion migration, increasing active sites.

Conclusions:

  • The ternary NiCoMo-LDH/NF catalyst exhibits superior electrocatalytic properties for OER compared to binary NiCo-LDH.
  • The enhanced performance is attributed to the modified microstructure, increased active sites, and improved intermediate adsorption/desorption.
  • NiCoMo-LDH/NF is a highly promising, low-cost electrode material for efficient hydrogen production through water splitting.