State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, People's Republic of China.
Langmuir. 2011 May 3;27(9):5582-8. doi: 10.1021/la2003589. Epub 2011 Apr 8.
Electrocatalytically active platinum (Pt) nanoparticles on a carbon nanotube (CNT) with enhanced nucleation and stability have been demonstrated through introduction of electron-conducting polyaniline (PANI) to bridge the Pt nanoparticles and CNT walls with the presence of platinum-nitride (Pt-N) bonding and π-π bonding. The Pt colloids were prepared through ethanol reduction under the protection of aniline, the CNT was dispersed well with the existence of aniline in the solution, and aniline was polymerized in the presence of a protonic acid (HCl) and an oxidant (NH(4)S(2)O(8)). The synthesized PANI is found to wrap around the CNT as a result of π-π bonding, and highly dispersed Pt nanoparticles are loaded onto the CNT with narrowly distributed particle sizes ranging from 2.0 to 4.0 nm due to the polymer stabilization and existence of Pt-N bonding. The Pt-PANI/CNT catalysts are electroactive and exhibit excellent electrochemical stability and therefore promise potential applications in proton exchange membrane fuel cells.
通过引入导电聚苯胺 (PANI) 来桥接 Pt 纳米粒子和 CNT 壁，同时存在铂氮化物 (Pt-N) 键和π-π键，在存在 Pt-N 键和π-π键的情况下，在碳纳米管 (CNT) 上实现了具有增强成核和稳定性的电催化活性 Pt 纳米粒子。Pt 胶体是通过苯胺保护下的乙醇还原制备的，在溶液中存在苯胺的情况下，CNT 得到了很好的分散，并且苯胺在质子酸 (HCl) 和氧化剂 (NH(4)S(2)O(8)) 的存在下聚合。由于π-π键的存在，合成的 PANI 被发现包裹在 CNT 周围，由于聚合物稳定化和 Pt-N 键的存在，高度分散的 Pt 纳米粒子负载在 CNT 上，粒径分布窄，范围为 2.0 至 4.0nm。Pt-PANI/CNT 催化剂具有电活性，表现出优异的电化学稳定性，因此有望在质子交换膜燃料电池中得到应用。
