A Highly Efficient, Clean-Surface, Porous Platinum Electrocatalyst and the Inhibition Effect of Surfactants on Catalytic Activity
A Highly Efficient, Clean-Surface, Porous Platinum Electrocatalyst and the Inhibition Effect of Surfactants on Catalytic Activity
复制标题
高效、表面洁净、多孔铂电催化剂及表面活性剂对催化活性的抑制作用
DOI：
10.1002/chem.201203398
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发表时间：
2013-01-01
影响因子：
4.3
通讯作者：
Geng, Baoyou
中科院分区：
文献类型：
--
作者：
Wang, Shaozhen;Kuai, Long;Geng, Baoyou
在此，我们报道了一种温和的无籽和无表面杂质的方法，用于制备清洁表面的多孔铂纳米颗粒。在电催化甲醇氧化方面，清洁表面的多孔铂表现出更好的性能比铂纳米颗粒和商业Pt/C催化剂。多孔纳米结构表现出比Pt/C催化剂高2.26倍的质量活性和高2.8倍的比活性。更重要的是，选择了三种典型的表面活性剂，十六烷基三甲基溴化铵/氯化物（CTAB/C），聚（乙烯基吡咯烷酮），十二烷基硫酸钠，研究表面活性剂对电催化性能的抑制作用。据观察，表面活性剂导致电催化性能的明显选择性降低。CTAB/C对催化活性的抑制作用最大，这是由于富含OH的铂表面与带正电荷的分子之间有较强的相互作用。因此，这项工作表明，这些清洁的表面多孔铂纳米粒子可用作直接甲醇燃料电池的有效催化剂，并提供了更好的理解表面活性剂对催化活性的抑制作用。
Herein we report a gentle seedless and surfactant-free method for the preparation of clean-surface porous platinum nanoparticles. In terms of electrocatalytic CH3OH 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, cetyltrime-thylammonium 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.