| 摘要: | 摘要
氫氧化鎳/奈米碳管/碳纖維複合電極之製備及其於尿素溶液中電極動力學之研究
在許多食品加工的副產品、農業施肥使用的肥料或是家庭使用的洗衣劑都含有尿素的汙染物，當其被排放到河川、大海會造成大自然的優養化。本研究主要透過一步驟電泳共沉積法將Ni(OH)2觸媒材料以及奈米碳管合成在碳纖維表面，並藉由後續的水熱反應過程製備出碳纖維複合電極材料，並探討碳纖維複合電極材料在電解尿素的表現行為。
從FE-SEM的分析結果可以得知，碳纖維的前處理過程可以有效去除其外層的環氧樹脂。而從XPS的分析結果可以得知，奈米碳管的前處理過程能使其表面功能化，並且表面的含氧官能基的比例與酸洗時間呈現正相關。而這樣的特性被證實是有助於後續碳纖維複合電極材料的合成。在XRD的分析結果可以得知，水熱反應的過程可以有效提升Ni(OH)2觸媒材料的結晶性。
藉由FE-SEM、EDS-Mapping、TGA、Raman分析結果證實了碳纖維複合電極材料已經被成功合成出來。從循環伏安法的分析結果可以明顯觀測到反應峰值電流與掃描速率的根次方的變化呈線性關係，證實了電解反應系統為擴散控制機制。在Tafel極化曲線的結果得知，碳纖維複合電極材料的交換電流密度為0.056 (A/m2)。從UV-vis的分析結果可以得知，尿素的官能基特徵峰有減少證實了其有被降解。本研究已經成功利用簡單、低成本的製程合成出氫氧化鎳奈米碳管複合電極材料，並能夠比傳統電極材料所需較少的過電位應用在尿素降解反應。
關鍵字 : 奈米碳管、碳纖維、氫氧化鎳、複合電極、尿素。
;Abstract
Fabrication of Ni(OH)2 / Carbon Nanotubes / Carbon Fiber Composite Electrode and Its Electrode Kinetics in Urea Solution
Many by-products of food processing, fertilizers used in agricultural fertilization, or laundry detergent used in households contain urea pollutants. When it is discharged into river and sea, it will cause eutrophication of nature.This research mainly synthesizes Ni(OH)2 catalyst material and carbon nanotubes on the surface of carbon fiber by one-step electrophoretic co-deposition method, and prepares carbon fiber composite electrode material through the subsequent hydrothermal reaction process, and discusses carbon fiber composite electrode The performance of the material in the electrolysis of urea.
According to the analysis results of FE-SEM, the pretreatment process of carbon fiber can effectively remove the epoxy resin on the outer layer. From the analysis results of XPS, it can be known that the pretreatment process of carbon nanotubes can functionalize the surface, and the proportion of oxygen-containing functional groups on the surface is positively correlated with the pickling time. And such characteristics have been proved to help the subsequent synthesis of carbon fiber composite electrode materials. According to the XRD analysis results, the hydrothermal reaction process can effectively improve the crystallinity of Ni(OH)2 catalyst materials.
The analysis results of FE-SEM, EDS-Mapping, TGA, and Raman confirm that the carbon fiber composite electrode material has been successfully synthesized. From the analysis results of cyclic voltammetry, it can be clearly observed that there is a linear relationship between the peak current of the reaction and the root of the scan rate, which proves that the electrolysis reaction system is a diffusion control mechanism. According to the results of the Tafel polarization curve, the exchange current density of the carbon fiber composite electrode material is 0.056 (A/m2). From the UV-vis analysis results, it can be known that the reduction of the characteristic peaks of the functional groups of urea confirms its degradation. In this study, a simple and low-cost process has been successfully used to synthesize nickel hydroxide carbon nanotube composite electrode materials, which can be used in urea degradation reactions with less overpotential than traditional electrode materials.
Keywords: Carbon nanotubes, carbon fibers, nickel hydroxide, composite electrodes, urea. |
