Effects of Acid Treatment on the Electrocatalysis Properties of PtCuLaOx/C Composite Membrane Materials

摘要:

如何提高Pt在薄膜电极上的利用率是相关研究的热点。本研究采用离子束溅射沉积技术(IBS)，在石墨纤维布基底表面制备了PtCuLaOx复合薄膜催化电极材料。采用X射线衍射仪（XRD）及原子力显微镜（AFM）分析了薄膜物相组成及表面结构。在三电极密封电解池体系中采用循环伏安法（CV）和线性扫描伏安法（LSV）分析不同酸处理条件对薄膜电催化性能的影响。结果表明，PtCuLaOx薄膜的晶粒尺寸在30 nm左右，经酸处理后晶粒尺寸变大。在温度50 ℃, 0.5 mol/L的H2SO4溶液中经30 min后处理的薄膜样品，其电化学活性比表面积（ESA）和交换电流密度（i0）均为最高，其载铂量仅为0.0802 mg/cm2，具有很高的性价比

Abstract:

It is the hot spot that how to improve the utilization rate of Pt on membrane electrodes. In the present study, the PtCuLaOx composite membrane electrode materials were fabricated on the surface of graphite fibrous cloth by ion beam sputtering (IBS). The phase composition and the surface structure of PtCuLaOx membrane were tested by X-ray diffraction (XRD) and atomic force microscope (AFM). The cyclic voltammetry (CV) and linear sweep voltammetry (LSV) were used to analyze the influence of different acid treatment conditions on the membrane electrocatalysis performance in a tri-electrode system. The results indicate that the PtCuLaOx membrane grain sizes are in the scope about 30 nm, and after acid treatment they become bigger. The sample acid-treated at 50 °C for 30 min in the solution of H2SO4 (0.5 mol/L) has the best electrochemical activity surface area (ESA) and exchange current density (i0). Its platinum loading capacity is only 0.0802 mg/cm2, and has very high ratio of performance to price.