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Mesoporous titanium nitride supported Pt nanoparticles as high performance catalysts for methanol electrooxidation
Minghui Yang1, Zhiming Cui, Francis J DiSalvo
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA. m.yang@cornell.edu
Physical Chemistry Chemical Physics : PCCP
|December 11, 2012
Summary
Mesoporous titanium nitride (TiN) offers superior electrocatalytic activity for methanol oxidation compared to traditional carbon supports. This novel material demonstrates enhanced performance and stability, paving the way for advanced fuel cell technologies.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Titanium nitride (TiN) is a promising material due to its electrical conductivity and chemical stability.
- Developing efficient electrocatalysts is crucial for advancing fuel cell technology.
- Mesoporous materials offer high surface areas beneficial for catalytic applications.
Purpose of the Study:
- To synthesize mesoporous titanium nitride (TiN) using a novel solid-solid phase separation method.
- To characterize the structural and electrical properties of the synthesized TiN.
- To evaluate the electrocatalytic performance of platinum supported on TiN (Pt/TiN) for methanol electrooxidation.
Main Methods:
- Solid-solid phase separation method utilizing Zn(2)TiO(4) precursor.
- Powder X-ray Diffraction (PXRD) for structural analysis.
- Electrical conductivity measurements.
- Electrochemical testing of Pt/TiN catalysts for methanol electrooxidation.
Main Results:
- Successfully synthesized single-phase rocksalt structure TiN with a domain size of 25 nm.
- Achieved high electrical conductivity of 395 S cm(-1) for mesoporous TiN.
- Pt/TiN catalyst showed a more negative onset potential (0.15 V) and higher peak current density (228 mA mg(-1) Pt) for methanol electrooxidation compared to Pt/C.
- Demonstrated excellent long-term stability for the Pt/TiN catalyst.
Conclusions:
- Mesoporous TiN can be efficiently prepared via a novel solid-solid phase separation method.
- Mesoporous TiN serves as a highly effective support for electrocatalysts.
- Pt/TiN catalysts exhibit superior intrinsic electrocatalytic activity and stability for methanol oxidation, indicating their potential for fuel cell applications.
