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首页> 外文期刊>Chemistry: A European journal >A Highly Efficient, Clean-Surface, Porous Platinum Electrocatalyst and the Inhibition Effect of Surfactants on Catalytic Activity
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A Highly Efficient, Clean-Surface, Porous Platinum Electrocatalyst and the Inhibition Effect of Surfactants on Catalytic Activity

机译：高效，清洁表面的多孔铂电催化剂以及表面活性剂对催化活性的抑制作用

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摘要

Herein we report a gentle seedless and surfactant-free method for the preparation of clean-surface porous platinum nanoparticles. In terms of electrocatalytic CH_3OH oxidation, the clean-surface porous platinum exhibited better performance than platinum nanoparticles and a commercial Pt/C catalyst. The porous nanostructures exhibited 2.26-fold higher mass activity and 2.8-fold greater specific activity than the Pt/C catalyst. More importantly, three typical surfactants, cetyltrimethylammonium bromide/chloride (CTAB/C), poly(vinylpyrrolidone), and sodium dodecyl sulfate, were chosen to study the inhibition effect of surfactants on electrocatalytic performance. It was observed that the surfactants led to a clear selective decrease in electrocatalytic performance. CTAB/C inhibited the catalytic activity the most due to the stronger interaction between the OH-enriched platinum surface and the positively charged molecules. Thus, this work indicates that these clean-surface porous platinum nanoparticles may be used as efficient catalysts for direct methanol fuel cells and provides a greater understanding of the inhibition effects of surfactants on catalytic activity.
机译：本文中，我们报告了一种制备无尘表面多孔铂纳米粒子的温和无核方法。就电催化CH_3OH氧化而言，表面清洁的多孔铂表现出比铂纳米颗粒和市售Pt / C催化剂更好的性能。多孔纳米结构表现出比Pt / C催化剂高2.26倍的质量活性和2.8倍高的比活性。更重要的是，选择了三种典型的表面活性剂，即十六烷基三甲基溴化铵/氯化物（CTAB / C），聚乙烯吡咯烷酮和十二烷基硫酸钠来研究表面活性剂对电催化性能的抑制作用。观察到表面活性剂导致电催化性能明显的选择性降低。由于富含OH的铂表面与带正电的分子之间的相互作用更强，因此CTAB / C对催化活性的抑制作用最大。因此，这项工作表明这些清洁表面的多孔铂纳米颗粒可以用作直接甲醇燃料电池的有效催化剂，并且可以更好地理解表面活性剂对催化活性的抑制作用。

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