摘要
通过离子束溅射技术(IBS)制备了不同厚度比的PtCu/LaOx-C和LaOx/PtCu-C载体型双层膜电极;采用三电极体系测试了样品的阴极析氢极化曲线,并通过交换电流密度(i0)和分解电势(Ed)的求算结果优选出最优样品;采用XRD分析了最优样品的物相结构信息;采用SEM及EDS研究了各元素的含量分布。结果表明:PtCu层与LaOx层的沉积时间比为5∶5的PtCu/LaOx-C载体型双层膜电极析氢催化性能最优,平衡状态下的分解电势为-0.204(V vs SCE),交换电流密度达到了147.0μA/cm2;双层结构薄膜中,Cu与Pt形成了合金,而LaOx能降低Pt的晶粒尺寸,并促进Pt(111)择优取向生长。
The supported PtCu/LaOx-C and LaOx/PtCu-C double-layer membrane electrodes with different thickness ratios were prepared by ion beam sputtering（IBS）.The cathodic hydrogen evolution polarization curves of these double-layer membrane electrodes were tested by using a three-electrode system,and the optimal sample was selected by calculating exchange current density～i0） and decomposition voltage～Ed）.Phase structure of the optimal sample was analyzed by X-ray diffractiometry（XRD）.The elemental distribution was analyzed by scanning electron microscopy（SEM） combined with energy dispersive spectrometry（EDS）.The results indicate that the optimal sample is the supported PtCu/LaOx-C double-layer membrane electrode whose deposition time ratio of PtCu-layer to LaOx-layer is 5：5.Its decomposition voltage and exchange current density are-0.204（V vs SCE） and 147.0μA/cm2 respectively under balanced condition.This double-layer structure membrane is shown that Cu has alloyed with Pt,and LaOx can not only decrease grain size of Pt but also contribute to the preferential growth of Pt（111）.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2011年第4期586-591,共6页
Journal of Materials Science and Engineering
基金
云南省应用基础研究基金资助项目(2008ZC007M)
昆明理工大学分析测试基金资助项目(2007-04
2010008)
