Ultrasonic-assisted synthesis of carbon nanotube supported bimetallic Pt–Ru nanoparticles for effective methanol oxidation
Ultrasonic-assisted synthesis of carbon nanotube supported bimetallic Pt–Ru nanoparticles for effective methanol oxidation
复制标题
DOI：
10.1039/c5ta00695c
复制
发表时间：
2015-04
影响因子：
--
通讯作者：
Yazhou Zhou;Yazhou Zhou;Guohai Yang;H. Pan;Chengzhou Zhu;Shaofang Fu;Qiurong Shi;Dan Du;Xiao-Nong Cheng;Juan-Yu Yang;C. Wai;Yuehe Lin
中科院分区：
文献类型：
--
作者：
Yazhou Zhou;Yazhou Zhou;Guohai Yang;H. Pan;Chengzhou Zhu;Shaofang Fu;Qiurong Shi;Dan Du;Xiao-Nong Cheng;Juan-Yu Yang;C. Wai;Yuehe Lin
本文采用超声波一步法合成了羧酸根功能化的多壁碳纳米管负载铂钌纳米颗粒（Pt-Ru/c-MWNT）催化剂。结果表明，该催化剂中Pt-Ru原子比约为1：1，Pt的质量负载量为8%。此外，Pt-Ru纳米粒子的结构，超小的尺寸（1.9 nm），和均匀的分散在c-MWNTs的表面上，表现出对甲醇氧化的电催化性能增强。研究发现，该催化剂的电化学活性表面积（ECSA）（133.2 m2 gPt-1）和甲醇氧化电流密度（1236.0 mA mgPt-1）远高于商业Pt/C（20wt%）（55.6 m2 gPt-1，214.2 mA mgPt-1）。此外，Pt-Ru/c-MWNT催化剂在10 000 s时的氧化电流密度为22.5 mA mgPt-1，这表明Pt-Ru/c-MWNT催化剂在酸性介质中对甲醇氧化具有长期的高电催化活性。
In this paper, we demonstrate a facile and one-step ultrasonic method to synthesize a carboxylate functionalized multi-walled carbon nanotube supported bimetallic platinum ruthenium nanoparticle (Pt–Ru/c-MWNT) catalyst. The results show that the atomic Pt–Ru ratio is approximately 1 : 1, and the Pt mass loading in the catalyst is 8%. In addition, Pt–Ru nanoparticles with bimetallic structure, ultrasmall size (1.9 nm), and uniform distribution were well-dispersed onto the surface of c-MWNTs, which exhibit enhanced electrocatalytic performance toward methanol oxidation. It is found that this catalyst has a much higher electrochemically active surface area (ECSA) (133.2 m2 gPt−1) and current density for methanol oxidation (1236.0 mA mgPt−1) than those of commercial Pt/C (20 wt%) (55.6 m2 gPt−1, 214.2 mA mgPt−1). Furthermore, the oxidation current density of the Pt–Ru/c-MWNT catalyst at 10 000 s is 22.5 mA mgPt−1, which indicates a long-term high electrocatalytic activity of the Pt–Ru/c-MWNT catalyst for methanol oxidation in acid media.