Preparation of Highly Dispersed and Ultrafine Pt Particles on Carbon Nanotubes used as an Effective Electrochemical Catalyst

摘要:

研究了不同分散程度的双壁碳纳米管(DWCNTs)作为载体沉积Pt，得到了尺寸2.08 nm的Pt颗粒均匀分散于DWCNTs表面。这种尺寸与分散状态的Pt颗粒相比其样品显示了极高的电催化活性(电流密度为0.022 A·cm?2，电化学比表面积为86.38 m2 ·g-1)。进一步的分析表明，载体在溶液中的浓度对形成Pt颗粒的尺寸和分布具有重要影响，这种尺寸与分散状态的Pt颗粒可以实现高电催化活性和低成本的Pt催化剂制备

Abstract:

This study investigated different dispersed double-walled carbon nanotubes (DWCNTs) as supports for depositing Pt nanoparticles. Homogenously dispersed Pt particles with sizes of approximately 2.08 nm were obtained on DWCNT surfaces. The size and the dispersion state of the Pt particles on the DWCNT support exhibit stronger hydrogen desorption/adsorption peaks and higher electrochemical activity (electric current density is 0.022 A·cm?2 and electrochemical specific surface area is 86.38 m2·g-1) compared to the other Pt/DWCNT catalysts. Further analysis shows that the concentration of the support in the suspension significantly affects the size and the uniformity of the generated Pt particles. The Pt particles of the size and the state on the supports can realize a Pt catalyst with high electrochemical activity and low cost.