煅燒溫度對陽極氧化製備多孔性二氧化鈦電極之影響

Effects of Heat Temperature on the Characterization of TiO2 Electrode by an Anodic Oxidation

本研究利用陽極氧化法製備多孔性二氧化鈦電極，以0.1 M和0.01 M氟化銨為電解液經陽極氧化後於不同溫度煅燒 （300°C、350°C、400°C、450°C、500°C、550°C、600°C）。實驗結果顯示，以0.1 M 氟化銨溶液進行陽極氧化 （操作電壓20 V） 後再經400°C 煅燒之二氧化鈦電極擁有最高的降解效率（79.16%），由掃描式電子顯微鏡可以得知其擁有較完整之二氧化鈦奈米管陣列結構。而由XRD 以及拉曼圖譜可得知當煅燒溫度為350°C-500°C 時，其銳鈦礦相衍射峰逐漸產生。另由光電流密度和光電催化降解結果顯示，經陽極氧化後進行煅燒之二氧化鈦電極擁有較高光電流密度使光電催化性能增加。

In this study, a porous titanium dioxide electrode was prepared usingan anodic oxidation in 0.1 M and 0.01 M NH4F electrolyte and calcined atdifferent temperatures (300°C, 350°C, 400°C, 450°C, 500°C, 550°C and600°C). The results indicated that the TiO2 electrode was made with the0.1 M NH4F by anodization (20 V) and calcination at 400°C, which had thehighest photoelectrocatalytic degradation efficiency of 79.16% and morecomplete structure of titania nanotubes observed by scanning electronmicroscopy. The XRD and Raman analysis results show that the intensityof anatase diffraction appears gradually when calcined temperature increasedfrom 350°C to 500°C. In addition, the photoelectrocatalytic degradationefficiency of TiO2 electrode increases with anodization followedby calcination due to a higher photocurrent density.