PtCu/C合金固溶度梯度薄膜催化剂的后处理改性和析氢性能表征  

Modification and hydrogen evolution characteristics of post-processing PtCu/C alloy solid solubility gradient membrane catalyst

作　　者：魏白光[1] 郝鑫禹 WEI Bai-guang;HAO Xin-yu(Jilin Institute of Chemical Technology,Jilin 132022,Jilin,China;Integration of Production and Education and Innovationand Entrepreneurship Center,Hezhou University,Hezhou 542899,Guangxi,China)

机构地区：[1]吉林化工学院,吉林吉林132022 [2]贺州学院产教融合与创新创业中心,广西贺州542899

出　　处：《材料工程》2019年第11期107-114,共8页Journal of Materials Engineering

基　　金：吉林化工学院项目(2018016)

摘　　要：通过离子束溅射(IBS)与Pt,Cu双靶移动工艺制备PtCu/C合金固溶度梯度薄膜。利用1mol/L的HNO3对梯度薄膜进行表面刻蚀处理,得到具有大比表面积的催化剂表面结构。X射线衍射(XRD)分析结果表明:复合膜电极表层形成了PtCu置换固溶体合金,原有的Pt晶格收缩,晶面间距缩小;原子力显微镜(AFM)和高分辨透射电镜RTEM&STEM测试结果表明:后处理的样品表面具有多峰结构和沟孔状结构;采用循环伏安法(CV)和线性扫描伏安法(LSV)对样品的电化学析氢性能进行测试,结果表明:梯度材料去合金化可以有效地降低铂载量的同时,提高电化学析氢交换电流密度,后处理样品的Pt载量降低20.29%,电化学析氢交换电流密度达到0.004217A/cm^2,催化性能提高20.58%。PtCu/C membrane catalysts were prepared by ion beam sputtering(IBS) with moving bimetallic Pt and Cu targets. The surface structure of the catalyst with large specific surface area was obtained by surface etching of the gradient membrane with 1 mol/L HNO3. The results of X-ray diffraction(XRD) analysis show that the PtCu replacement solid solution alloy is formed on the surface of the composite membrane electrode, the original Pt lattice is contracted and the spacing between the crystal planes is narrowed. Atomic force microscopy(AFM) and high resolution transmission electron microscopy(HRTEM) RTEM-STEM measurements show that the surface of the post-processed samples has multi-peak structure and trench-pore structure. Cyclic voltammetry(CV) and linear sweep voltammetry(LSV) were used to test the electrochemical hydrogen evolution performance of the samples. The results show that the dealloying of gradient materials can effectively reduce the platinum loading and improve the exchange current density of electrochemical hydrogen evolution. The Pt loading of the post-treatment sample is decreased by 20.29%, the exchange current density of electrochemical hydrogen evolution reaches 0.004217 A/cm^2, and the catalytic performance is improved by 20.58%.

关 键 词：离子束溅射 梯度薄膜 催化剂 PtCu/C 

分 类 号：TG146.3[一般工业技术—材料科学与工程]