Elaboration of Cu−Pd Films by Coelectrodeposition: Application to Nitrate Electroreduction
Elaboration of Cu−Pd Films by Coelectrodeposition: Application to Nitrate Electroreduction
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DOI：
10.1021/jp805484t
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发表时间：
2009-01
影响因子：
3.7
通讯作者：
D. Reyter;D. Bélanger;L. Roué
中科院分区：
文献类型：
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作者：
D. Reyter;D. Bélanger;L. Roué
在这项研究中，纳米晶铜-钯薄膜合成了广泛的组合物，通过共电沉积Pd和Cu在1 M NaCl溶液中含有CuCl 2和PdCl 2以各种比例。沉积电位固定在−0.5 V，相对于饱和甘汞电极（SCE）。这些涂层通过扫描电子显微镜结合能量色散X射线分析（SEM-EDX）、X射线衍射（XRD）和X射线光电子能谱（XPS）进行表征。这些分析揭示了Pd和Cu在膜的整个表面内和整个表面上的精细且均匀的分布。根据溶液中Cu（II）/Pd（II）的比例，获得单相富Pd膜（Pd 95 Cu 5或Pd 88 Cu 12合金）或两相膜（含有不同比例的Pd 80 Cu 20和Cu相）。这些材料被测试作为电催化剂在碱性介质中的硝酸盐还原。电化学测试表明，双相材料（Pd_（80）Cu_（20）+ Cu）具有最好的电催化活性。
In this study, nanocrystalline copper−palladium films were synthesized over a wide range of compositions by coelectrodeposition of Pd and Cu in a 1 M NaCl solution containing both CuCl2 and PdCl2 in various proportions. The deposition potential was fixed at −0.5 V versus a saturated calomel electrode (SCE). These coatings were characterized by scanning electron microscopy coupled to energy dispersive X-ray analysis (SEM−EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). These analyses revealed a fine and homogeneous distribution of Pd and Cu within and over the whole surface of the film. Depending upon the Cu(II)/Pd(II) ratio in solution, monophased Pd-rich films (Pd95Cu5 or Pd88Cu12 alloys) or biphased films (containing Pd80Cu20 and Cu phases in different proportions) were obtained. Theses materials were tested as electrocatalysts for nitrate reduction in alkaline media. Electrochemical measurements showed that biphasic (Pd80Cu20 + Cu) materials displayed the best electrocatalytic...