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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。
How to improve the utilization rate of Pt on the membrane electrode is a hot research topic. In this study, ion beam sputtering deposition technology (IBS) was used to prepare PtCuLaOx composite thin film catalytic electrode material on the surface of graphite fiber cloth substrate. The phase composition and surface structure of the films were analyzed by X-ray diffraction (XRD) and atomic force microscopy (AFM). Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) were used to analyze the effects of different acid treatment conditions on the electrocatalytic performance of the membrane in a three-electrode sealed cell system. The results show that the grain size of PtCuLaOx thin film is about 30 nm, and the grain size becomes larger after acid treatment. The thin film samples treated with 0.5 mol / L H2SO4 solution at 50 ℃ for 30 min showed the highest electrochemical active surface area (ESA) and exchange current density (i0), with a maximum of 0.0802 mg / cm2, with a high price.