Codeposition of Pd and Au on a Ni wire was explored using a simple treatment of Ni wire electrodes in aqueous solutions containing both K₂PdCl₄ and HAuCl₄, and the electrochemical properties of the thus-prepared electrodes were evaluated by recording cyclic voltammograms (CVs) of 1.0 M ethanol in 1.0 M NaOH aqueous solutions. Compared with the Pd-deposited Ni wire electrodes prepared by treatment in aqueous solutions of K₂PdCl₄, a remarkable increase in the electrocatalytic current of ethanol oxidation was observed when both the concentrations of K₂PdCl₄ and HAuCl₄ were as low as 0.10 mM and after the treatment for 10 min at 30 °C. The results of the EDS elemental mapping analysis show that the distributions of Pd and Au on the Ni surface were not identical and that Au deposited preferentially on Ni. By observing the changes in the CV responses depending on the concentrations of K₂PdCl₄ and HAuCl₄ and performing stepwise modifications, the promotion or acceleration of the codeposition of PdAu was found to be achieved due to the coexistence of K₂PdCl₄ and HAuCl₄ in aqueous solutions. Because the codeposition of PdAu revealed in the present work was significant, it was found that PdAu-modified or PdAu-coated Ni materials could be prepared via simple galvanic replacement reactions without using any reducing reagents and additives.

中文翻译：

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乙醇氧化通过电置换反应在镍丝电极上共沉积钯和金

通过在包含K ₂ PdCl ₄和HAuCl _4的水溶液中对镍丝电极进行简单处理，探索了镍丝上Pd和Au的共沉积，并通过记录循环伏安图（CVs）评估了由此制备的电极的电化学性能。 ）1.0 M乙醇在1.0 M NaOH水溶液中的溶液。与在K ₂ PdCl _4的水溶液中处理过的沉积Pd的Ni丝电极相比，当K ₂ PdCl ₄和HAuCl ₄的浓度均显着增加了乙醇氧化的电催化电流。低至0.10 mM，并在30°C处理10分钟后。EDS元素映射分析的结果表明，Ni表面上Pd和Au的分布不相同，Au优先沉积在Ni上。通过观察取决于K ₂ PdCl ₄和HAuCl ₄浓度的CV反应变化并进行逐步修饰，发现由于K ₂ PdCl ₄和HAuCl共存，实现了PdAu共定位的促进或加速₄在水溶液中。由于本工作揭示的PdAu的共沉积意义重大，因此发现可以通过简单的电置换反应制备PdAu改性或PdAu涂层的Ni材料，而无需使用任何还原剂和添加剂。