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通过种子生长法和自组装技术合成Ag@Pt核壳结构纳米粒子(以下简称Ag@Pt粒子),测量和比较在电催化循环伏安扫描(以下简称CV扫描)过程中失效前后的Ag@Pt粒子对甲醇的电催化性能的变化,采用透射电镜、高分辨电镜、X射线光电子能谱等方法研究其失效机理.结果表明:Ag@Pt粒子在循环伏安扫描的过程中会发生空化现象,其临界电压为0.5 V,空化现象随时间的增长而变得明显;Ag@Pt粒子空化后形成由Ag包覆空心Pt壳的纳米粒子,这是导致其在对甲醇进行电催化氧化过程中催化性能明显下降的原因.
The Ag @ Pt core-shell nanoparticles (Ag @ Pt particles) were synthesized by the seed growth method and self-assembly technique. The Ag @ Pt nanoparticles were measured and compared before and after the electrocatalytic cyclic voltammetry (CV) Particles on the electrocatalytic performance of methanol changes, the use of transmission electron microscopy, high resolution electron microscopy, X-ray photoelectron spectroscopy and other methods to study the failure mechanism.The results show that: Ag @ Pt particles during cyclic voltammetry in the process of cavitation occurs , The critical voltage is 0.5 V, the cavitation phenomenon becomes obvious with the growth of time; Ag @ Pt particles cavitation to form nanoparticles coated with hollow Pt shell nanoparticles, which led to its electrocatalytic oxidation of methanol The reason for the significant decrease of catalytic performance in the process.