Pt3Sn Nanoparticles with Controlled Size: High-Temperature Synthesis and Room-Temperature Catalytic Activation for Electrochemical Methanol Oxidation
Pt3Sn Nanoparticles with Controlled Size: High-Temperature Synthesis and Room-Temperature Catalytic Activation for Electrochemical Methanol Oxidation
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DOI：
10.1021/jp0739263
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发表时间：
2007-08
影响因子：
3.7
通讯作者：
Zhufang Liu;D. Reed;Gihan Kwon;M. Shamsuzzoha;D. Nikles
中科院分区：
文献类型：
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作者：
Zhufang Liu;D. Reed;Gihan Kwon;M. Shamsuzzoha;D. Nikles
我们报道了一种制备碳载 Pt3Sn 纳米粒子催化剂的新方法，用于甲醇和 CO 氧化。通过乙酰丙酮铂和乙酰丙酮锡在高沸点溶剂三辛胺中共还原，合成了具有立方相的合金化 Pt3Sn 纳米颗粒。通过改变引入的封端剂（油胺和油酸）的量来控制3.0至6.5 nm范围内的粒径。所制备的颗粒显示出窄的尺寸分布并且没有催化活性。通过用四甲基氢氧化铵（TMAOH）溶液处理，去除配体以激活纳米颗粒以进行催化。处理后的 Pt3Sn 颗粒可以在 TMAOH 溶液中稳定，并最终通过物理沉积负载在 XC-72 碳载体上。循环伏安法和CO溶出表明所有Pt3Sn颗粒对甲醇和CO氧化均表现出较高的电催化活性。尺寸依赖性 CO 汽提研究表明 COads 氧化在低电位下开始......
We report a new method of preparing carbon-supported Pt3Sn nanoparticle catalysts for methanol and CO oxidation. Alloyed Pt3Sn nanoparticles with a cubic phase were synthesized by coreduction of platinum acetylacetonate and tin acetylacetonate in a high-boiling solvent, trioctylamine. Particle sizes in the range of 3.0 to 6.5 nm were controlled by varying the amount of introduced capping agents (oleylamine and oleic acid). The as-prepared particles displayed a narrow size distribution and were catalytically inactive. The ligands were removed to activate the nanoparticles for catalysis by treatment with tetramethylammonium hydroxide (TMAOH) solution. The treated Pt3Sn particles can be stabilized in TMAOH solution and finally loaded on XC-72 carbon support by physical deposition. Cyclic voltammetry and CO-stripping showed that all the Pt3Sn particles exhibited high electrocatalytic activity for methanol and CO oxidation. The size-dependent CO-stripping study indicated COads oxidation started at low potentia...