Preparation of Pt/C via a polyol process Investigation on carbon support adding sequence
Preparation of Pt/C via a polyol process Investigation on carbon support adding sequence
复制标题
DOI：
10.1016/j.ijhydene.2011.06.022
复制
发表时间：
2011-08
期刊：
影响因子：
--
通讯作者：
J. Qi;Luhua Jiang;Mingyi Jing;Qiwen Tang;Gongquan Sun
中科院分区：
文献类型：
--
作者：
J. Qi;Luhua Jiang;Mingyi Jing;Qiwen Tang;Gongquan Sun
为了考察碳载体加入顺序对催化剂制备过程中Pt颗粒大小和Pt利用率的影响，制备了一系列Pt/C电催化剂。（不同的Pt负载量，两种碳载体-Vulcan XC和Black Pearls 2000），即Pt/C-a（首先还原Pt离子以形成Pt纳米颗粒，其随后沉积在碳载体上）和Pt/C-b（Pt前体首先用碳载体浸渍，然后还原成Pt纳米颗粒）。采用X射线衍射、透射电镜和氮气吸附等手段对催化剂的物理性能进行了表征。采用动电位法对催化剂对氧还原反应和甲醇氧化反应的催化活性进行了表征。结果表明，碳载体的加入顺序对Pt颗粒的大小有显著影响，尤其是微孔数量较多的碳载体，其催化活性也不同。
To investigate the effect of carbon support adding sequence on Pt particle sizes and Pt utilizations during the polyol process of the electrocatalyst preparation, a series of Pt/C electrocatalysts (different Pt loadings, two kinds of carbon supports−Vulcan XC and Black Pearls 2000) were prepared, namely, Pt/C-a (first reduced Pt ions to form Pt nanoparticles, which subsequently deposited on carbon supports) and Pt/C-b (Pt precursors were first impregnated with carbon supports, then reduced to Pt nanoparticles). The physical properties of the electrocatalysts were characterized by X-ray diffraction, transmission electron microscopy and nitrogen adsorption. The catalytic activities of the electrocatalysts toward the oxygen reduction reaction and the methanol oxidation reaction were characterized by potentiodynamic measurements. The results show that the carbon support adding sequence has significant effects on the Pt particle sizes, especially for the carbon supports with large amount of micropores, as a result, leading to different catalytic activities.