Palladium Deposition on Nickel Wire Electrodes by a Galvanic Replacement Reaction
Palladium Deposition on Nickel Wire Electrodes by a Galvanic Replacement Reaction
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DOI：
10.1021/acsaem.9b00182
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发表时间：
2019-03-01
影响因子：
6.4
通讯作者：
Oyama, Munetaka
中科院分区：
文献类型：
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作者：
Kobayashi, Yusuke;Yoshida, Hiromu;Oyama, Munetaka
探讨了钯修饰镍丝电极在钯修饰镍（Pd/Ni）复合材料电催化应用中的实际应用。原则上，Pd/Ni线电极可以通过简单的电流置换反应制备，例如，通过简单地将一段镍丝浸入PdCl_（42-）的水溶液中，然而，我们在室温下的初步试验表明，制备的重现性不好：事实上，在某些情况下，即使我们进行了相同的制备程序，Pd也不能在Ni上改性。为了提高改性的重现性，我们研究了镍丝的预处理和水溶液的温度的影响。因此，发现用1.0M HCl水溶液和升高的温度（例如50 ℃）预处理对改善Pd改性是有效的。在改进的条件下，通过控制浸渍时间，可以控制Pd在Ni上的修饰状态。为了全面理解制备贵金属改性的普通金属丝的原电池置换反应，使用Pt前体在Ni上和Pd改性在其他金属丝Fe、Cu和Co上获得的结果与Pd/Ni丝的情况相比被示出和讨论。
Practical aspects of the modification of palladium on nickel wire electrodes were explored for the electrocatalytic applications of palladium-modified nickel (Pd/Ni) composite materials. In principle, Pd/Ni wire electrodes could be prepared via a simple galvanic replacement reaction, e.g., between tetrachloropalladate (PdCl42-) and Ni by simply immersing a piece of Ni wire into an aqueous solution of PdCl42-. However, our preliminary trials at room temperature indicated that the reproducibility of the preparation is not good: in fact, Pd could not be modified on Ni in some cases even though we conducted the same preparation procedures. To improve the reproducibility of the modification, we studied the effects of pretreatments of Ni wire and the temperature of aqueous solutions. Consequently, it was found that the pretreatment with 1.0 M HCl aqueous solution and increased temperature, such as 50 degrees C, were effective to improve the Pd modification. The control of the modified states of Pd on Ni was found to be possible under the improved conditions by controlling the immersion time. For the comprehensive understanding of galvanic replacement reactions for preparing noble-metal-modified common metal wires, the results obtained using Pt precursors on Ni and the Pd modification on other metal wires, Fe, Cu, and Co, are shown and discussed compared with the case of Pd/Ni wire.