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通过光化学还原法,以HAuCl4溶液为前躯体,用312nm的紫外光辐照,在20min内合成了红色Au纳米粒子溶胶。用苯硫酚溶液和5wt%HF溶液分别改性管径为20～40nm的多壁碳纳米管(MWCNTs),并将合成的Au纳米粒子负载在改性的MWCNTs表面,制备了不同方法改性的Au/MWCNTs纳米催化剂。TEM显示,Au纳米颗粒平均粒径为4.3nm,在MWCNTs表面的负载效果是HF的改性明显好于苯硫酚。在KOH溶液碱性介质中,电化学测试表明,苯硫酚和HF两种不同方法改性后,Au/MWCNTs纳米催化剂对甲醇具有一定的电催化活性,但后者具有更高的催化活性和更好的稳定性。
The red Au nanoparticle sol was synthesized by photochemical reduction with HAuCl4 solution as the precursor and 312 nm UV irradiation. Multiwalled carbon nanotubes (MWCNTs) with diameter of 20 ~ 40nm were respectively modified with thiophenol solution and 5wt% HF solution, and the synthesized Au nanoparticles were loaded on the surface of modified MWCNTs to prepare different methods to modify Au / MWCNTs nanocatalyst. TEM showed that the average particle size of Au nanoparticles was 4.3 nm. The loading effect on the surface of MWCNTs was that the modification of HF was obviously better than thiophenol. In alkaline solution of KOH solution, electrochemical tests showed that the Au / MWCNTs nanocatalysts have some electrocatalytic activity toward methanol after being modified by thiophenol and HF, but the latter has higher catalytic activity Better stability.