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应用晶种生长法制得金纳米立方体,Aucore-Pdshell和Aucore-Pdshell-Ptcluster电催化剂,通过改变溶液的H2PdCl4和H2PtCl6的用量以控制Pdshell的厚度和Ptcluster的覆盖度.采用扫描电镜(SEM)、透射电镜(TEM)观察了金纳米立方体的表面结构.利用循环伏安法(CV)研究了不同Pd层厚度的立方体形Aucore-Pdshell纳米粒子和不同Pt岛覆盖度的立方体形Aucore-Pdshell-Ptcluster纳米粒子对甲酸氧化的电催化性能.结果表明,与立方体形Aucore-Pdshell纳米粒子相比,“核-壳-岛”结构的立方体形Aucore-Pdshell-Ptcluster纳米粒子对甲酸的电氧化具有更高活性.当Pd壳层厚度为3层,Pt岛覆盖度为0.5时,电催化活性最高.
Gold nanocubes, Aucore-Pdshell and Aucore-Pdshell-Ptcluster electrocatalysts were prepared by seed crystal growth method to control the thickness of Pdshell and the coverage of Ptcluster by changing the amount of H2PdCl4 and H2PtCl6 in the solution.Using scanning electron microscope (SEM) The surface structure of gold nanocubes was observed by electron microscopy (TEM). The cubic Aucore-Pdshell-Ptcluster nanocrystals with different Pd layer thickness and the cubic Aucore-Pdshell-Ptcluster nanocrystals with different Pt island coverage were investigated by cyclic voltammetry (CV) The results showed that Aucore-Pdshell-Ptcluster nanoparticle with “core-shell-island ” structure had more electrocatalytic activity for formic acid than the cubic Aucore-Pdshell nanoparticle High activity.When the thickness of Pd shell is 3 layers and the coverage of Pt island is 0.5, the electrocatalytic activity is the highest.