Microwave polyol synthesis of Pt/CNTs catalysts: Effects of pH on particle size and electrocatalytic activity for methanol electrooxidization
Microwave polyol synthesis of Pt/CNTs catalysts: Effects of pH on particle size and electrocatalytic activity for methanol electrooxidization
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DOI：
10.1016/j.carbon.2005.03.030
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发表时间：
2005-08-01
期刊：
影响因子：
10.9
通讯作者：
Xu, ZD
中科院分区：
文献类型：
--
作者：
Li, X;Chen, WX;Xu, ZD
以碳纳米管（CNTs）为载体，通过微波加热不同pH值的铂盐乙二醇溶液，制备了不同平均粒径的碳纳米管负载铂纳米颗粒。TEM观察表明，当合成pH从3.4增加到9.2时，Pt颗粒变得更小且更均匀。当合成pH为3.6、5.8、7.4和9.2时，平均粒径分别为5.8、5.2、3.4和2.7 nm。研究了pH值对Pt颗粒尺寸和分布的影响。pH值是影响粒径大小的重要因素。通过调节合成溶液的pH值，可以选择Pt颗粒的大小，从而得到合适且均匀的Pt/CNTs。电化学测试结果表明，在pH值为7.4的合成液中制备的Pt/CNTs催化剂对甲醇的电氧化性能优于其它样品。(C)2005爱思唯尔有限公司保留所有权利。
Pt nanoparticles with different mean sizes supported on carbon nanotubes were synthesized by microwave heating ethylene glycol solutions of platinum salt with different pH in present of CNTs as supports. TEM examinations showed that Pt particles become smaller and more uniform when the synthesis pH increased from 3.4 to 9.2. The mean particle size was 5.8, 5.2, 3.4 and 2.7 nm when the synthesis pH was 3.6, 5.8, 7.4 and 9.2, respectively. The effects of the pH on Pt particle size and distribution were investigated. The pH was an important factor that influenced the particle size. Pt particles size could be thus selected by adjusting the synthesis solution pH. Pt/CNTs with suitable and uniform Pt particle size could be obtained. Electrochemical measurements showed that the Pt/CNTs catalyst prepared from the synthesis solution pH of 7.4 exhibited better performances for methanol electrooxidization than other samples. (C) 2005 Elsevier Ltd. All rights reserved.