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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Efficient Electrocatalytic Hydrogen Evolution from MoS2-Functionalized Mo2N Nanostructures.

Kasinath Ojha1, Soumen Saha1, Shivali Banerjee1

  • 1Department of Chemistry, Indian Institute of Technology Delhi , Hauz Khas, New Delhi-110016, India.

ACS Applied Materials & Interfaces
|March 1, 2017
PubMed
Summary
This summary is machine-generated.

Molybdenum-based composites show promise as platinum alternatives for hydrogen evolution reactions. Conjugating molybdenum nitride (Mo₂N) with molybdenum disulfide (MoS₂) enhances catalytic activity and stability in acidic media.

Keywords:
Mo2NMoS2electrocatalysishydrogen evolution reactionsnanocomposites

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Platinum is the benchmark catalyst for hydrogen evolution reactions (HER), but its high cost necessitates alternatives.
  • Molybdenum-based compounds, such as molybdenum nitride (Mo₂N) and molybdenum disulfide (MoS₂), are being explored for HER applications.

Purpose of the Study:

  • To investigate molybdenum-based compounds and their composites as potential platinum alternatives for HER.
  • To understand the role of interfaces between Mo₂N and MoS₂ in enhancing electrocatalytic activity.

Main Methods:

  • Synthesis of Mo₂N-MoS₂ composites.
  • Electrochemical characterization of HER performance, including current density and stability tests.
  • Analysis of reaction mechanism and kinetics using Tafel slopes and charge transfer resistance.

Main Results:

  • Mo₂N nanostructures conjugated with few-layer MoS₂ exhibited significantly enhanced HER electrocatalytic activity.
  • The Mo₂N-MoS₂ composite demonstrated a high catalytic current density of ~175 mA cm⁻² at 400 mV and over 18 hours of electrochemical stability in acidic media.
  • Increasing MoS₂ content in the composite led to a decrease in HER activity.

Conclusions:

  • Mo₂N-MoS₂ composites are effective electrocatalysts for HER, offering a viable alternative to platinum.
  • The interface between Mo₂N and MoS₂ plays a crucial role in boosting catalytic performance.
  • Optimizing the MoS₂ content is essential for maximizing HER efficiency in these composites.