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Robust Porous TiN Layer for Improved Oxygen Evolution Reaction Performance.

Gaoyang Liu1,2, Faguo Hou1,2, Xindong Wang1,2

  • 1State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China.

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

Developing a novel porous titanium nitride (TiN-Ti) catalyst support significantly enhances electrocatalyst performance for proton exchange membrane (PEM) water electrolysis. This improved support boosts activity and stability, paving the way for industrial applications.

Keywords:
iridium oxideoxygen evolution reactionproton exchange membrane water electrolysisthermal nitridingtitanium nitride

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Proton exchange membrane (PEM) water electrolysis is crucial for hydrogen production but hindered by poor reversibility and slow kinetics of current electrocatalysts.
  • Developing high-performance, cost-effective electrocatalysts is essential to overcome kinetic limitations and enable industrialization.

Purpose of the Study:

  • To engineer a novel catalyst support with enhanced porosity and electronic conductivity.
  • To improve the electrocatalytic activity and stability of iridium oxide (IrOx) based catalysts for PEM water electrolysis.

Main Methods:

  • Surface modification of titanium (Ti) sheets using a thermal nitriding method in an ammonia atmosphere to create a porous titanium nitride (TiN-Ti) support.
  • Characterization of the TiN-Ti support's morphology, composition, and electronic conductivity.
  • Loading IrOx onto the TiN-Ti support and evaluating its electrochemical performance using techniques like cyclic voltammetry and electrochemical impedance spectroscopy.

Main Results:

  • A TiN layer with a granular porous structure and internal defects was successfully formed on the Ti sheet, significantly increasing electronic conductivity to 120.8 S cm−1.
  • IrOx/TiN-Ti catalysts exhibited better IrOx dispersion, reduced ohmic and charge transfer resistance, and increased accessible active sites compared to IrOx/Ti.
  • The IrOx/TiN-Ti catalyst demonstrated superior electrocatalytic activity (η10 mA cm−2 = 302 mV) and stability (overpotential degradation rate: 0.067 mV h−1).

Conclusions:

  • The novel TiN-Ti support enhances mass adsorption/transport, IrOx dispersion, electronic conductivity, and corrosion resistance.
  • The developed IrOx/TiN-Ti catalyst shows remarkable performance and stability, offering a promising solution for efficient PEM water electrolysis.
  • This approach addresses key challenges in catalyst design for industrial-scale electrochemical hydrogen production.