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Te/Pt nanonetwork modified carbon fiber microelectrodes for methanol oxidation
Hsiang-Yu Tsai1, Zih-Yu Shih, Zong-Hong Lin
1Department of Chemistry, National Taiwan University, 1 Section 4 Roosevelt Road, Taipei 106, Taiwan.
Nanotechnology
|April 13, 2013
Summary
New Te/Pt nanonetwork-decorated carbon fiber microelectrodes (CFMEs) show promise for direct methanol fuel cells (DMFCs). These catalysts offer high activity and durability for methanol oxidation, potentially leading to more cost-effective fuel cells.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Direct methanol fuel cells (DMFCs) are a promising energy conversion technology.
- Development of efficient and cost-effective anode catalysts is crucial for DMFC performance.
Purpose of the Study:
- To fabricate and characterize Te/Pt nanonetwork-decorated carbon fiber microelectrodes (CFMEs) for use as anodic catalysts in DMFCs.
- To investigate the electrocatalytic activity, durability, and methanol tolerance of the developed Te/PtCFMEs.
Main Methods:
- Seed-mediated growth of tellurium (Te) nanowires and their deposition onto CFMEs.
- Galvanic replacement reaction between Te nanonetworks and PtCl6(2-) to form Te/PtCFMEs.
- Electrochemical characterization of methanol oxidation using cyclic voltammetry and chronoamperometry.
Main Results:
- Te/PtCFMEs exhibited a high electrochemical active surface area (129.2 m(2) g(-1)) and catalytic activity (1.2 A mg(-1)).
- The electrodes demonstrated high current density (20.0 mA cm(-2)), long durability, and tolerance to poisoning species during methanol oxidation.
- Enhanced current density was achieved by using multiple Te/PtCFMEs.
Conclusions:
- Low-cost, stable, and effective Te/PtCFMEs were successfully fabricated.
- These novel electrodes show significant potential for application in cost-effective direct methanol fuel cells.
