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首页> 外文期刊>International Journal of Electrochemical Science >Electrodeposited Mesoporous Pt and Pt@CB Films as Electrocatalysts for the Oxygen Reduction Reactions and Ethanol Electrooxidation in Both Acid and Alkaline Media
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Electrodeposited Mesoporous Pt and Pt@CB Films as Electrocatalysts for the Oxygen Reduction Reactions and Ethanol Electrooxidation in Both Acid and Alkaline Media

机译：电沉积介孔Pt和Pt @ CB膜在酸性和碱性介质中作为氧还原反应和乙醇电氧化的电催化剂

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In this study, mesoporous Pt and Pt@CB were electrodeposited using galvanostatic and potentiostatic2 methods from liquid crystalline surfactant templates with different amount of Pt (0.25-4.20 mg/m ).These samples were characterized by SAXS, TEM and SEM in order to understand the growth processand to characterize the end product. Thereafter their potential as electrocatalysts for energy conversionin fuel cells was studied. The oxygen reduction reaction (ORR) is the cathode reaction in fuel cells andbecause of its importance it has been studed intensively. ORR kinetics is slow and proceed viadifferent meachanism and, consequently, the reaction has been widely investigated in both acidic andalkaline aqueous solutions on different catalysts. Here, ORR on these mesoposous Pt samples wasstudied using a rotating disk electrode in acidic media and promising results were obtained: The massactivities were better than those of other Pt electrocatalysts reported in the literature: the mass activity2 for 0.5 mg/m Pt loading was 2.4 A/gPt at 0.9 V vs. RHE with a rotation rate of 2400 rpm. Ethanol isconsidered as a promising alternative fuel for portable fuel cells. Hence, the activity of theelectrodeposited mesoporous Pt and Pt@CB for ethanol oxidation in alkaline media was also studiedand the results showed that mesoporous Pt@CB has a high activity as the onset potentials was sifter100 mV to more negative potentials than for other Pt based catalyst reported in the literature. Theseresults showed that mesoporous Pt electrocatalyst have also a high potential in direct ethanol fuel cells.
机译：本研究采用恒电流和恒电位方法从具有不同Pt量（0.25-4.20 mg / m）的液晶表面活性剂模板中电沉积介孔Pt和Pt @ CB，并对这些样品进行SAXS，TEM和SEM表征。生长过程并表征最终产品。此后，研究了它们作为燃料电池中能量转化的电催化剂的潜力。氧还原反应（ORR）是燃料电池中的阴极反应，由于其重要性，已经对其进行了深入研究。 ORR动力学很慢，并且通过不同的机理进行，因此，已经在酸性和碱性水溶液中使用不同的催化剂对反应进行了广泛的研究。在此，使用旋转盘电极在酸性介质中研究了这些介孔Pt样品的ORR，并获得了可喜的结果：质量活性优于文献报道的其他Pt电催化剂：0.5 mg / m Pt负载下的质量活度2为2.4 A / gPt在0.9 V相对于RHE的情况下，转速为2400 rpm。乙醇被认为是用于便携式燃料电池的有前途的替代燃料。因此，还研究了电沉积介孔Pt和Pt @ CB在碱性介质中对乙醇氧化的活性，结果表明，介孔Pt @ CB比起其他基于Pt的催化剂具有更高的活性，因为其起始电势比100 mV高出更多。文献报道。这些结果表明，介孔Pt电催化剂在直接乙醇燃料电池中也具有很高的潜力。

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