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常压微等离子体电极是一种有望取代常用贵金属电极用于电化学反应的气体电极.然而目前关于微等离子体阳极与离子溶液界面反应的研究及其用于金属电沉积的报道还较少.本文使用常压微等离子体作为阳极,通过紫外-可见吸收光谱监测阳极电解液中亚铁氰化钾被氧化生成的铁氰化钾的含量,发现铁氰化钾的含量随放电时间的延长而增加,并且其增加的速率与放电电流成比例.在放电结束后,随着放置时间的延长铁氰化钾的含量继续升高,其升高的速率与放电时间的长短有关.放电结束后铁氰化钾含量的增加速率远小于放电时的增加速率.实验结果表明微等离子体电极可以作为气体阳极在等离子体和液体界面进行电荷传输,并引发电化学反应,同时在放电的过程中产生了氧化活性物质.在饱和硫酸铜溶液中,使用微等离子体阳极可以在不锈钢阴极上进行铜的电沉积,电流效率达到90%.
Atmospheric pressure plasma electrode is a kind of gas electrode, which is expected to replace the commonly used noble metal electrode for electrochemical reaction.However, the current research on the interfacial reaction between micro-plasma anode and ionic solution and its application in metal electrodeposition are still rare. In this paper, atmospheric pressure micro-plasma was used as an anode. The content of potassium ferricyanide produced by the oxidation of potassium ferrocyanide in the anolyte was monitored by UV-Vis absorption spectroscopy. It was found that the content of potassium ferricyanide increased with the extension of discharge time Increases, and its rate of increase is proportional to the discharge current.After the discharge, the content of potassium ferricyanide continues to increase with the increase of the deposition time, and the rate of increase depends on the discharge time.After the discharge, the content of iron The rate of increase of potassium cyanide content is much less than that of discharge. The experimental results show that the micro-plasma electrode can act as a gas anode for charge transport at plasma and liquid interface and initiate electrochemical reaction, Oxidation of active substances in the saturated solution of copper sulfate, the use of micro-plasma anodes can be carried out on the stainless steel cathode copper electrodeposition, Current efficiency up to 90%.