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Te/Pt nanonetwork modified carbon fiber microelectrodes for methanol oxidation

机译：Te / Pt纳米网络修饰的碳纤维微电极用于甲醇氧化

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摘要

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.
机译：Te / Pt纳米网络修饰的碳纤维微电极（CFME）已被制造出来并用作直接甲醇燃料电池（DMFC）中的阳极催化剂。 Te纳米线是由碲离子（TeO3〜（2-））通过种子介导的生长过程制备的，并沉积到CFME上形成三维Te纳米网络。然后，Te纳米网络充当骨架和还原剂，通过电流置换反应将PtCl6〜（2-）离子还原为Te / Pt，从而形成Te / PtCFME。通过控制反应时间，可以控制Pt的量和Te / Pt纳米网络的形貌，从而导致不同程度的电催化活性。 Te / PtCFME具有较高的电化学活性表面积（129.2 m〜2 g〜（-1）），良好的催化活性（1.2 A mg〜（-1）），高的电流密度（20.0 mA cm〜（-2） ），耐用性强，并且对含有1 M甲醇的0.5 M硫酸中的甲醇氧化中毒物质具有耐受性。我们进一步证明了通过分别使用3和5 Te / PtCFME可以提高电流密度。我们的研究结果表明，低成本，稳定且有效的Te / PtCFME在制造具有成本效益的燃料电池方面具有巨大潜力。

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