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首页> 外文期刊>ACS applied materials & interfaces >Biobutanol as Fuel for Direct Alcohol Fuel Cells-Investigation of SnModified Pt Catalyst for Butanol Electro-oxidation
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Biobutanol as Fuel for Direct Alcohol Fuel Cells-Investigation of SnModified Pt Catalyst for Butanol Electro-oxidation

机译：生物丁醇作为直接醇类燃料电池的燃料-丁醇电氧化Sn修饰的Pt催化剂的研究

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摘要

Direct alcohol fuel cells (DAFCs) mostly use low molecular weight alcohols such as methanol and ethanol as fuels. However, short-chain alcohol molecules have a relative high membrane crossover rate in DAFCs and a low energy density. Long chain alcohols such as butanol have a higher BIO-MASS energy density, as well as a lower membrane crossover rate compared to methanol and ethanol. Although a significant number of studies have been dedicated to low molecular weight alcohols in DAFCs, very few studies are available for longer chain alcohols such as butanol. A significant development in the production of biobutanol and its proposed application as an alternative fuel to gasoline in the past decade makes butanol an interesting candidate fuel for fuel cells. Different butanol isomers were compared in this study on various Pt and PtSn bimetallic catalysts for their electro-oxidation activities in acidic media. Clear distinctive behaviors were observed for each of the different butanol isomers using cyclic voltammetry (CV), indicating a difference in activity and the mechanism of oxidation. The voltammograms of both n-butanol and iso-butanol showed similar characteristic features, indicating a similar reaction mechanism, whereas 2-butanol showed completely different features; for example, it did not show any indication of poisoning. Ter-butanol was found to be inactive for oxidation on Pt. In situ FTIR. and CV analysis showed that OHads was essential for the oxidation of primary butanol isomers which only forms at high potentials on Pt. In order to enhance the water oxidation and produce Had, at lower potentials, Pt was modified by the oxophilic metal Sn and the bimetallic PtSn was studied for the oxidation of butanol isomers. A significant enhancement in the oxidation of the 1 butanol isomers was observed on addition of Sn to the Pt, resulting in an oxidafion peak at a potential 520 mV lower than that found on pure Pt. The higher activity of PtSn was attributed to the bifunctional mechanism on PtSn catalyst. The positive influence of Sn was also confirmed in the PtSn nanoparticle catalyst prepared by the modification of commercial Pt/C nanoparticle and a higher activity was observed for PtSn (3:1) composition. The temperature -dependent data showed that the activation energy for butanol oxidation reaction over PtSn/C is lower than that over Pt/C.
机译：直接酒精燃料电池（DAFC）大多使用低分子量的酒精，例如甲醇和乙醇作为燃料。但是，短链醇分子在DAFC中具有较高的膜穿透率和较低的能量密度。与甲醇和乙醇相比，长链醇（例如丁醇）具有更高的BIO-MASS能量密度，以及更低的膜穿透率。尽管已经有大量的研究致力于DAFC中的低分子量醇，但是对于长链醇（如丁醇）的研究却很少。在过去的十年中，生物丁醇生产的重大发展及其作为汽油替代燃料的拟议应用使丁醇成为燃料电池的有趣候选燃料。在这项研究中，比较了不同丁醇异构体在各种Pt和PtSn双金属催化剂上在酸性介质中的电氧化活性。使用循环伏安法（CV）对每种不同的丁醇异构体观察到明显的独特行为，表明活性和氧化机理存在差异。正丁醇和异丁醇的伏安图均显示相似的特征，表明相似的反应机理，而2-丁醇则显示出完全不同的特征。例如，它没有显示任何中毒迹象。发现叔丁醇对于在Pt上氧化没有活性。原位FTIR。 CV分析表明，OHads对于伯丁醇异构体的氧化至关重要，伯丁醇异构体仅在Pt上以高电势形成。为了增强水的氧化并产生Had，在较低的电势下，Pt被亲氧金属Sn改性，并研究了双金属PtSn用于丁醇异构体的氧化。在向Pt中添加Sn时，观察到1种丁醇异构体的氧化显着增强，导致氧化峰的电势比纯Pt峰低520 mV。 PtSn的较高活性归因于PtSn催化剂的双功能机理。在通过商业化Pt / C纳米粒子的改性而制备的PtSn纳米粒子催化剂中，也证实了Sn的积极影响，并且观察到PtSn（3：1）组成具有更高的活性。温度相关数据表明，PtSn / C上丁醇氧化反应的活化能低于Pt / C上。

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