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首页> 外文会议>2nd International EUSPEN Conference on Precision Engineering Nanotechnology Vol.1, May 27th-31st, 2001, Turin, Italy >Nanofabrication of Pd/Ti Nanostructured Electrodes by Electrophoretic Deposition of Pd Colloidal Dispersions
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Nanofabrication of Pd/Ti Nanostructured Electrodes by Electrophoretic Deposition of Pd Colloidal Dispersions

机译：电泳沉积钯胶体分散体制备纳米钯/钛电极

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Pd is the famous electrode material for water electrolysis and hydrogen-oxygen full cell due to its high electrochemical activity and unique electrode properties inherently different from Pt and Ni. In order to increase the specific surface area and understand whether novel electrochemical properties are present, the development of Pd nanostructured electrodes is of great interest and important. Only few reports deal with the preparation of Pd nanostructured electrodes until now, and they were focused primarily on the glassy carbon-supported palladium nanostructured electrode prepared by vacuum evaporation. In this study, the Pd/Ti nanostructured electrode was prepared first by the electrophoretic deposition of monodispersed Pd colloids (11.9nm) in the reverse micellar solution of water/AOT/isooctane and the followed sintering in an atmosphere of Ar/H_2(9/1) at 400℃ for 2h. Although small Pd agglomerates (c.a. 36nm) were formed, they could be orderly deposited on Ti support under the electric field. The electrochemical properties of the sintered Pd/Ti electrodes with various Pd amounts were investigated by cyclic voltammetry in 1.0 M NaOH solutions. It was observed that the resultant Pd/Ti nanostructured electrodes showed significantly higher electrochemical activities and lower hydrogen overpotentials than bulk Pd electrode due to their large specific surface areas. In addition, it was found that hydrogen overpotential significantly decreased with the reduction of the Pd amount deposited. This could be attributed to the increase of specific surface area, resulting from the less serious sintering. In conclusion, this work proposed another practical method to prepare the Pd electrodes with high specific surface areas and low hydrogen overpotentials. It was also helpful for the development of nanostructured electrodes.
机译：Pd具有高电化学活性和独特的电极性能，与Pt和Ni固有不同，是水电解和氢氧全电池的著名电极材料。为了增加比表面积并了解是否存在新颖的电化学性能，Pd纳米结构电极的开发倍受关注和重要。到目前为止，只有很少的报道涉及钯纳米结构电极的制备，并且它们主要集中在通过真空蒸发制备的玻璃状碳载钯纳米结构电极上。在本研究中，首先通过在水/ AOT /异辛烷的反胶束溶液中电泳沉积单分散的Pd胶体（11.9nm），然后在Ar / H_2（9 / 1）在400℃下2h。尽管形成了小的Pd附聚物（约36nm），但它们可以在电场下有序地沉积在Ti载体上。通过循环伏安法在1.0 M NaOH溶液中研究了各种Pd量的Pd / Ti烧结电极的电化学性能。观察到，由于它们的大的比表面积，所得到的Pd / Ti纳米结构的电极比体Pd电极显示出明显更高的电化学活性和更低的氢超电势。另外，发现随着沉积的Pd量的减少，氢超电势显着降低。这可能归因于较不严重的烧结所导致的比表面积的增加。总之，这项工作提出了另一种实用的方法来制备具有高比表面积和低氢超电势的Pd电极。这也有助于纳米结构电极的开发。

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