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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
Published on: April 27, 2018
Electrocatalysis on shape-controlled titanium nitride nanocrystals for the oxygen reduction reaction
Youzhen Dong1, Yongmin Wu, Mengjia Liu
1Department of Chemistry, Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Tsinghua University, Beijing 100084 (PR China).
Chemsuschem
|September 17, 2013
Summary
Titanium nitride nanotubes offer a cost-effective alternative to platinum catalysts for the oxygen reduction reaction (ORR) in fuel cells. Their unique structure enhances catalytic activity and stability, paving the way for practical fuel cell applications.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Platinum (Pt)-based catalysts are expensive for oxygen reduction reaction (ORR) in fuel cells.
- Titanium nitrides (TiN) are promising low-cost, stable alternatives to Pt.
- Understanding shape-activity relationships in TiN catalysts is crucial for development.
Purpose of the Study:
- To investigate the effect of precursor morphology on TiN catalyst shape.
- To synthesize and characterize carbon-coated TiN nanotubes (TiN NTs) for ORR.
- To evaluate the electrocatalytic performance of TiN NTs compared to Pt.
Main Methods:
- Synthesized uniform carbon-coated TiN NTs via nitridation of TiO2 nanotubes and melamine.
- Tailored TiN morphology by adjusting the TiO2 precursor shape.
- Evaluated ORR activity, methanol tolerance, and stability of TiN NTs.
Main Results:
- Carbon-coated TiN NTs exhibited excellent ORR electrocatalytic activity.
- TiN NTs showed superior methanol tolerance and long-term stability over commercial Pt/C.
- The one-dimensional, hollow nanotube structure improved electrolyte diffusion and conductivity.
Conclusions:
- Morphology control of TiN precursors enables tailored TiN catalyst structures.
- Carbon-coated TiN NTs are highly effective non-precious metal ORR electrocatalysts.
- Nanotube morphology significantly enhances electrocatalytic performance for fuel cell applications.
