鉍複合奈米碳管鈦電極之電沉積時間參數探討

Discussion on Electrodeposition Time Parameters of Bismuth and Carbon Nanotubes Composited on Titanium Electrode

隨著科技進步與人口增加，能源議題為近年來各國所關注，燃料電池具有陽極產電陰極淨化廢水功能，系統陰極結合電芬頓高級氧化程序，將具備自我保持機制；而電極特性為影響電芬頓系統效能關鍵因素。鈦具備良好耐腐蝕性及穩定性；奈米碳管具備良好電導性及高比表面積；鉍具備良好電化學活性，均具備良好電極材料之特性。本研究藉不同電沉積時間在鈦基材表面製備複合電極，並以（1）掃描式電子顯微鏡進行形貌觀察；（2）接觸角分析電極表面親水性變化；（3）線性掃描伏安法評估過氧化氫生成能力；（4）循環伏安法進行電極活性面積量測；（5）鐵弗外插法觀察電極抗腐蝕能力；（6） RhB（Rhodamine B）降解率量測。結果顯示，在電沉積時間5分鐘電極，系統具最佳效能，其電芬頓系統30分鐘脫色率可達68.5 %；結果可提供電芬頓系統陰極未來研究及應用參考。

With the advancement of technology and the enhancement in population, energy issues have attracted the attention of countries in recent years, the fuel cell has the functions of anode electricity generation and cathode wastewater purification, the cathode system combined with the advanced oxidation processes of Electro-Fenton, which can construct self-holding mechanism; the characteristics of electrode are the key factors affecting performance of the Electro-Fenton system. Titanium has good corrosion resistance and stability; carbon nanotubes have good electrical conductivity and high specific surface area; bismuth possesses good electrochemical activity, all of these are suitable to apply to electrode. In this study, composite electrodes were prepared on the surface of titanium by different electrodeposition times, and the experimental results were carried out by：(1) SEM surface observation；(2) contact angle measurement to analyze the hydrophilicity for surface；(3) linear sweep voltammetry to evaluate the ability to generate H2O2 for cathode; (4) cyclic voltammetry to calculate the active area for each electrode；(5) Tafel extrapolation to measure the corrosion resistance for electrode；(6) decolorization test for Rhodamine B in Electro-Fenton system. The results show that the composite electrode prepared at 5 min by electrodeposition exhibited the best performance, which the decolorization rate of the Electro-Fenton system can reach 68.5 % in 30 min. It is expected that results will provide reference for the cathode application of the Electro-Fenton system in future.