title: Te/Pt nanonetwork modified carbon fiber microelectrodes for methanol oxidation.
abstract: 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.
authors.affiliation: Department of Chemistry, National Taiwan University, 1 Section 4 Roosevelt Road, Taipei 106, Taiwan.
authors.forename: Hsiang-Yu
authors.initials: HY
authors.lastname: Tsai
authors.forename: Zih-Yu
authors.initials: ZY
authors.lastname: Shih
authors.forename: Zong-Hong
authors.initials: ZH
authors.lastname: Lin
authors.forename: Huan-Tsung
authors.initials: HT
authors.lastname: Chang