離子液體-石墨-鎳(II)複合電極應用於尿素電催化反應與電化學偵測

Ionic Liquid-Graphite-Ni(II) Composite Electrode Used for the Electrocatalysis and Electroanalysis of Urea

陳俊達(Jyun-Da Chen)

指導教授 ： 陳泊余

高雄醫學大學/生命科學院/醫藥暨應用化學系碩士班/碩士(2014年)

https://doi.org/10.6832/KMU.2014.00044

摘要

離子液體碳糊電極已被廣泛的研究並加以應用，而修飾上鎳的離子液體碳糊電極也有相關文獻，其修飾方法是先製備離子液體碳糊電極，再以浸泡吸附方式修飾得到含有鎳離子的離子液體碳糊電極，進行電化學催化使甲醛氧化。但因為使用浸泡方式製備，所以無法對鎳的濃度進行定量。而本實驗主要探討藉著不同離子液體並結合不同來源之二價鎳離子，並以網版印刷碳電極(SPCE)為基材，製備離子液體-石墨-鎳離子(NiII)複合電極對尿素之電化學行為與偵測之應用進行探討。在離子液體中，鎳二價(NiII)的來源以添加NiCl2與陽極電解的方式產生；因NiCl2無法溶解在BMPTFSI與BMIPF6離子液體裡，所以必須添加2當量與4當量BMPCl幫助鎳進行配位進而溶解。並利用電子顯微鏡(SEM)觀察離子液體-石墨-鎳離子(NiII)反應前後的型態改變。不同的離子液體對二價鎳離子配位環境皆有不同，所以本實驗利用可見光-紫外光吸收光譜儀，為不同的離子液體所配位的二價鎳離子進行鑑定。所使用之四種離子液體為BMPTFSI、BMPDCA、BMISAL、BMIPF6。並改變不同掃描速率以及不同鎳離子濃度改變探討彼此中電化學上的差異，以探討改變碳粉的混合比例對電化學上電流的影響，進而得到製備碳糊電極的最佳化條件，以利往後對尿素的電化學偵測。並以最佳化條件進行檢量線、穩定性、偵測極限、流動注射系統(FIA)之實驗，而離子液體-石墨-鎳離子(NiII)修飾電極之氧化電流與濃度間的線性範圍為5×10-6 M至5×10-4 M，偵測極限為2.5×10-6 M。

關鍵字

離子液體 ； 石墨 ； 複合電極 ； 尿素

並列摘要

Ionic liquid carbon past electrode has been widely studied and applied, in electrochemical analysis，and also in relevant journal about the modified nickel ion in ionic liquid. It is to prepare ionic liquid carbon past electrode , and then get electrode by immersed into ionic liquid containing nickel ion.
However, the electrode prepared by using immerse manner, so it is not possible to quantify the concentration of nickel. In this study, focuses on different ionic liquids by combining different sources of divalent nickel ion, and screen printed carbon electrode (SPCE) as substrate prepared Ionic liquid-Graphite-Nickel ion (NiII) modified electrode were discussed behavior for urea application and detection. In the ionic liquid, add the nickel ion divalent (NiII) source of NiCl2 , and anode electrolysis; and the NiCl2 can’t dissolve in BMPTFSI and BMIPF6, we have to add 4N and 2N of BMPCl respectively to help nickel dissolved. Using scanning electron microscopy (SEM) observation Ionic-liquid-Graphite-Nickel ion (NiII) before and after reaction patterns changed. The various divalent nickel ion have different complex environment, so in this study, we analysis different ionic liquids with complex divalent nickel ion (NiII) by visible light-UV absorption spectroscopy. By using four kind of ionic liquids are BMPTFSI、BMPDCA、BMISAL、BMIPF6, and change different scan rate 、 nickel
ion concentration、 graphite power ratio in electrochemical difference.
However, we can get optimized conditions of Ionic liquid-Graphite-Nickel ion (NiII) modified electrode. Using the optimized condition electrode for calibration curve、stability、detection limit、flow injection system(FIA), while the Ionic liquid-Graphite-Nickel ion (NiII)
modified electrode oxidation current and concentration of linear range of 5×10-6 M to 5×10-4 M， the detection limit is 2.5×10-6 M.

並列關鍵字

Ionic Liquid ； Graphite ； composite electrode ； urea

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