Pt/CNT纳米催化剂的微波快速合成及其对甲醇电化学氧化的电催化性能

碳纳米管 (CNT)作为制备新型催化剂载体已有广泛的研究 1～ 8] ,例如 ,在其表面负载 Pt,Ru和Pt Ru后则具有良好的催化性能1,2 ,6～ 8] .但在 CNT表面负载金属微粒的方法难以获得尺寸和形状均匀的纳米粒子 .因此 ,如何制备超细和均匀的纳米粒子是一项具有重要的学术意义和技术价值的工作 .我们利用微波加热的多元醇工艺合成了 XC-72碳负载铂纳米粒子的催化剂 ,并发现它对甲醇的氧化具有较高的电催化活性 9] .本文进一步以 CNT作为载体 ,利用微波加热法快速合成了 Pt/ CNT纳米催化剂 ,并对其对甲醇电化学氧化的性能进行了初步研究 …

Rapid Synthesis of Pt/Carbon Nanometer Catalyst by Microwave Irradiation and Its Electrocatalytic Activity for Electrooxidation of Methanol

As a rapid uniform and efficient heating method, microwave irradiation has been widely used in chemical reaction and preparing nanomaterials. Here Pt/carbon nanotube(CNT) catalysts with w(Pt)=18.1% and 9.4 % were rapidly synthesized by microwave irradiation heating polyol process and employing the ethylene glycol solution of H 2PtCl 6 as the precursors in the presence of CNT support. TEM imaging showed that microwave-prepared Pt nanoparticles were very uniform in size, with an average size of 3.1 nm, and uniformly dispersed on the CNT surface. Electrochemical experiments demonstrated that microwave-synthesized Pt/CNT catalysts exhibited a higher catalytic activity for electrooxidation of liquid methanol than E-TEK Pt/C. The significant improvement in catalyst performance derives from that microwave-synthesized Pt nanoparticles have a uniform small particle size and uniforml dispersion on the CNT surface.