Preparation of Gold Modified Nickel Wire Electrodes for Electroanalysis via a Galvanic Replacement Reaction
Preparation of Gold Modified Nickel Wire Electrodes for Electroanalysis via a Galvanic Replacement Reaction
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DOI：
10.1002/elan.201800077
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发表时间：
2018-07
期刊：
影响因子：
3
通讯作者：
Yuki Umeya;Yusuke Kobayashi;Toshiyuki Kawashimo;Sunyhik Ahn;G. Chang;M. Oyama
中科院分区：
文献类型：
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作者：
Yuki Umeya;Yusuke Kobayashi;Toshiyuki Kawashimo;Sunyhik Ahn;G. Chang;M. Oyama
采用氯金酸（AuCl4−）与镍基材料进行简单的电取代反应制备了金修饰镍（Ni）电极。通过将镍盘/线电极浸泡在AuCl4−水溶液中，在镍表面沉积了金的纳米或微结构。系统地改变了AuCl4−的浓度和浸泡时间，并用扫描电子显微镜（SEM）对镍丝的表面进行了表征。此外，在较低浓度（1.0×10−4 M以下）的AuCl4−条件下制备的Au修饰镍丝电极，在一定条件下观察了亚铁氰化物、尿酸和葡萄糖的电化学响应。因此，即使用1.0×10−6 M AuCl4−处理镍丝，也可以观察到亚铁氰化物的可逆电化学反应，尽管在SEM测量中没有观察到沉积。此外，在1.0×10−4 M AuCl4−以下，尿酸和葡萄糖的电催化活性可以得到控制。从可调的电催化性能、制备简单性和电极材料的成本来看，我们认为Au修饰的Ni电极在电分析中具有应用前景。另一方面，在我们的初步试验中，发现沉积的金纳米或微粒子的性能对几个因素很敏感。在单个电极上实现定量的金沉积需要进一步的工作。
Gold modified nickel (Ni) electrodes were prepared via a simple galvanic replacement reaction between chloroauric acid (AuCl4−) and Ni base materials. Au nano- or micro-structures were deposited on the Ni surface by immersing Ni disk/wire electrode in an aqueous solution of AuCl4−. The concentration of AuCl4− and the immersion time were systematically varied, and the surfaces of Ni wire were characterized by scanning electron microscopy (SEM). Furthermore, electrochemical responses of ferrocyanide, uric acid and glucose were observed with Au modified Ni wire electrodes prepared at lower concentrations of AuCl4− (below 1.0×10−4 M) after fixing some conditions. Consequently, reversible electrochemical responses of ferrocyanide could be observed even for Ni wire treated with 1.0×10−6 M AuCl4−, though no deposition was observed in the SEM measurements. Also, control of electrocatalytic activity was possible below 1.0×10−4 M AuCl4− for uric acid and glucose. Judging from the tunable electrocatalytic performance, simplicity of preparation, and the cost of electrode materials, we believe that Au modified Ni electrodes holds promise for applications in electroanalysis. On the other hand, in our preliminary trials, the properties of deposited Au nano- or micro-particles were found to be sensitive to several factors. Further work is needed to achieve quantitative Au deposition over individual electrodes.