氧化鋅/鋅赤血鹽與氧化鋅/鋅赤血鹽/氧化釕赤血鹽複合薄膜的電聚合製備、特性及其電催化性質之研究

The Preparation, Characterization and Electrocatalytic Behavior of Zinc Oxide/ Zinchexacyanoferrate Hybrid Film and Zinc Oxide/Zinchexacyanoferrate/Ruthenium Oxide Hexacyanoferrate Modified Electrodes

褚宏偉(Hung-Wei Chu)

指導教授 ： 陳生明

國立臺北科技大學/工程學院/化學工程研究所/碩士(2007年)

摘要

本研究主要分為兩部分來討論，第一部份為成功的製備一個具有電化學活性的氧化鋅/鋅赤血鹽(ZnO/ZnHCF)複合薄膜沈積在電極表面上，在pH＝2的H2SO4溶液中混合Zn(NO3)2和K3[Fe(CN)6]，藉由循環伏安法所製備而成的複合薄膜。 同時以循環伏安法(CV)和電化學石英晶體微天平法(EQCM)來研究複合薄膜的穩定成長的情形。在pH＝2溶液中，由循環伏安法可以看到有二對氧化還原對。複合薄膜的表面形態使用掃瞄式電子顯微鏡(SEM)和原子力量顯微鏡(AFM)來研究。由能量分散性分光儀(EDS)光譜證明了複合薄膜中氧化鋅的存在，並且研究不同單價的陽離子所顯示的形式電位作用。複合薄膜固定於修飾電極表面上，將修飾電極置於緩衝溶液裡對鳥嘌呤的氧化還原對進行電催化的反應。經由循環伏安法(CV)和旋轉電極(RDE)技術來證實ZnO/ZnHCF複合薄膜的對鳥嘌呤的電催化活性行為。最後使用流動注射分析法(FIA) 來分析應用對ZnO/ZnHCF複合薄膜於電極上的可行性。
第二部分為成功的製備氧化鋅/鋅赤血鹽/氧化釕赤血鹽(ZnO/ZnHCF/RuOHCF) 複合薄膜沈積在電極表面上，在pH＝2的H2SO4溶液中混合Zn(NO3)2、RuCl3和K3[Fe(CN)6]，藉由循環伏安法所製備而成。同時循環伏安法和電化學石英晶體微天平法(EQCM)來研究複合薄膜的穩定成長情形。複合薄膜的表面形態使用掃瞄式電子顯微鏡(SEM)來研究。由能量分散性分光儀(EDS)光譜證明了複合薄膜中氧化鋅和氧化釕赤血鹽(RuOHCF)的存在，並且研究不同單價的陽離子所顯示的形式電位作用。將複合薄膜固定在電極表面上，RuII/III氧化還原對在緩衝溶液裡的電化學反應發生在負電位區域，其表現出相對的電化學特性，進而證實複合薄膜是被固定在電極表面。經由循環伏安法和旋轉環碟電極(RRDE)技術來證實氧化鋅/鋅赤血鹽/氧化釕赤血鹽(ZnO/ZnHCF/RuOHCF)複合薄膜對腎上腺素、多巴胺和L-胱胺酸的氧化反應以及S2O82-、SO52- 和IO3- 的還原反應有電催化活性行為。

關鍵字

修飾電極 ； 複合薄膜 ； 電催化 ； 鳥嘌呤 ； 旋轉電極 ； 流動注射分析法 ； 硫氧離子 ； 旋轉環碟電極

並列摘要

Part 1. An electroactive polynuclear hybrid films of zinc oxide and zinc hexacyanoferrate (ZnO/ZnHCF) have been deposited on electrode surfaces from H2SO4 solution containing Zn(NO3)2 and K3[Fe(CN)6] by repetitive potential cycling method. Simultaneous cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM) measurements demonstrate the steady growth of hybrid film. There are two redox couples present in voltammograms of hybrid film and it is obvious in the case of pH 2. Surface morphology of the present hybrid film was investigated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Energy dispersive spectrometer (EDS) spectrum confirms the existence of zinc oxide in the hybrid film. The effect of type of monovalent cations on the redox behavior of resulting film was investigated. In pure supporting electrolyte, electrochemical responses of modified electrode resemble with that of a surface immobilized redox couple. The electrocatalytic activity of ZnO/ZnHCF hybrid film was investigated towards guanine using cyclic voltammetry and rotating disc electrode (RDE) techniques. Finally, feasibility of using ZnO/ZnHCF hybrid film-coated electrodes for analytical application was also investigated in flow injection analysis (FIA).
Part 2. Polynuclear mixed-valent hybrid films of zinc oxide/zinchexacyanoferrate /ruthenium oxide hexacyanoferrate (ZnO/ZnHCF/RuOHCF) have been deposited on electrode surfaces from H2SO4 solution containing Zn(NO3)2, RuCl3 and K3[Fe(CN)6] by potentidynamic cycling method. Simultaneous cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM) measurements demonstrate the steady growth of hybrid film. Surface morphology of hybrid film was investigated using scanning electron microscopy (SEM). Energy dispersive spectrometer (EDS) data confirm existence of zinc oxide and ruthenium oxide hexacyanoferrate (RuOHCF) in the hybrid film. The effect of type of monovalent cations on the redox behavior of hybrid film was investigated. In pure supporting electrolyte, electrochemical responses of RuII/III redox transition occurring at negative potential region resemble with that of a surface immobilized redox couple. The electrocatalytic activity of ZnO/ZnHCF/RuOHCF hybrid film was investigated towards oxidation of epinephrine, dopamine and L-cysteine, and reduction of S2O82- and SO52- as well as IO3- using cyclic voltammetry and rotating ring disc electrode (RRDE) techniques.

並列關鍵字

Modified electrodes ； Hybrid film ； Electrocatalysis ； Guanine ； RDE ； FIA ； Sulfur oxianions ； RRDE

參考文獻

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