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30nm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.
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