Te/Pt nanonetwork modified carbon fiber microelectrodes for methanol oxidation
| Autor: | Zong-Hong Lin, Hsiang-Yu Tsai, Huan-Tsung Chang, Zih-Yu Shih |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Reducing agent Mechanical Engineering Inorganic chemistry Bioengineering Sulfuric acid General Chemistry Electrochemistry Catalysis Anode chemistry.chemical_compound Direct methanol fuel cell chemistry Mechanics of Materials General Materials Science Fiber Methanol Electrical and Electronic Engineering |
| Zdroj: | Nanotechnology. 24(19) |
| ISSN: | 1361-6528 |
| Popis: | Te/Pt nanonetwork-decorated carbon fiber microelectrodes (CFMEs) have been fabricated and employed as anodic catalysts in a direct methanol fuel cell (DMFC). Te nanowires were prepared from tellurite ions (TeO3(2-)) through a seed-mediated growth process and were deposited onto CFMEs to form three-dimensional Te nanonetworks. The Te nanonetworks then acted as a framework and reducing agent to reduce PtCl6(2-) ions to form Te/Pt through a galvanic replacement reaction, leading to the formation of Te/PtCFMEs. By controlling the reaction time, the amount of Pt and morphology of Te/Pt nanonetworks were controlled, leading to various degrees of electrocatalytic activity. The Te/PtCFMEs provide a high electrochemical active surface area (129.2 m(2) g(-1)), good catalytic activity (1.2 A mg(-1)), high current density (20.0 mA cm(-2)), long durability, and tolerance toward the poisoning species for methanol oxidation in 0.5 M sulfuric acid containing 1 M methanol. We have further demonstrated an enhanced current density by separately using 3 and 5 Te/PtCFMEs. Our results show that the low-cost, stable, and effective Te/PtCFMEs have great potential in the fabrication of cost-effective fuel cells. |
| Databáze: | OpenAIRE |
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