摘要
分别以商用碳黑XC-72、介孔碳CMK-5和含多层次孔的碳气凝胶HCA为载体,微波法负载Pt纳米粒子,在硫酸和甲醇溶液中进行循环伏安测试,考察碳材料中多层次孔对其电催化活性的影响.结果显示,Pt/HCA电极表现出较高的峰电流(7.5mA·cm-2)和电化学活性面积(128.0m2·g-1).这可能是因为碳气凝胶具有连续但非周期性的介孔结构,有利于Pt纳米粒子的分散以及反应物质的传质.
The influence of hierarchical porosity on electrocatalytic property was investigated with Pt nanoparticles supported on three types of carbon materials, namely, commercial Vulcan XC-72, ordered mesoporous carbon CMK-5, and hierarchical carbon aerogel (HCA). The electrocatalytic activity of carbon supported Pt nanoparticles was verified by cyclic voltammetry in H2SO4 and CH3OH solution. Pt/HCA presented superior performance with higher peak current (7.5 mA·cm-2) and electrochemical active area (128.0 m2·g-1). This could be attributed to the carbon aerogel with continuous but nonperiodical mesopore structure, which facilitated dispersion of Pt nanoparticles and mass transport around reactants and products.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2008年第5期839-843,共5页
Acta Physico-Chimica Sinica
基金
江苏省高新技术(BG2005009)
航空科学基金(2007ZF52061)资助项目
关键词
碳气凝胶
多层次孔
铂纳米粒子
介孔
电催化活性
Carbon aerogel
Hierarchical porosity
Pt nanoparticles
Mesopore
Electrocatalytic property