The Study of Electrodeposition of TiO2 Nanostructures into Porous Alumite Substrate prepared in Oxalic Acid and Its Application in Photo-Electrochemical Module

[[abstract]]本研究是以電鍍溶膠二氧化鈦(Sol-gel TiO2)於陽極氧化鋁膜(AAO)孔洞內，以此作為光水解模組的陽極端，陰極端為白金(Pt)，在模組的中間置入質子交換膜(PEM)，以水及不同濃度的氫氧化鈉最作為電解液，來探討不同參數下對模組光電流的影響。 在製備陽極氧化鋁膜時，藉由找出最佳蝕刻與擴孔時間參數等，且在常溫下，其實驗結果可觀察到其高均勻度的陽極氧化鋁膜孔洞。 在電鍍二氧化鈦於陽極氧化鋁膜時，在直流1電伏特時，當電鍍時間持續至50分鐘後，可得到良好的電鍍效果。 最後，由實驗結果可知，在不同電解液與不同濃度對光生電流的影響，而又以氫氧化大當電解液時最為適合，再藉此調整其濃度，發現濃度越高的氫氧化鈉，其光生電流越大。此外，當質子交換膜預處理硫酸濃度為2M時，可量測到最佳光生電流，其值為86.2μA。[[abstract]]The investigation of TiO2-AAO, which was prepared by electrodeposition into the anodic aluminum oxide (AAO) as the anode of the photo-electrochemical module and Pt on the cathode , has been carried out in this thesis. Then, the TiO2-AAO samples were assembled with the PEM prepared with water and electrolyte of NaOH of various PH value. We expected to observe different photo-current of PEM modules assembled with TiO2-AAO and PEM prepared by different process parameters.When preparing for AAO, we tried to find out the appropriate etching time and pore-widening time under the room temperature condition. The experimental results have shown high uniform AAO.When preparing for TiO2-AAO, we observed the well-electrodepoisted TiO2 into the AAO with the conditions of dc 1V and electrodeposition time for 50 min. The experimental results have shown as follows: (1) Among the electrolyte solutions used in this work, the PEC Module using NaOH as electrolyte has the largest photo-current. (2) While adjusting the PH value of the NaOH electrolyte, the higher the PH value is, the larger the photo-current is. (3) The PEM prepared by H2SO4 of 2M has enabled module to generate the largest photo-current. To summarize the results, a highest photo-current of 86.2μA was generated by the module assembled with the optimum conditions described above