電化學製備摻雜碳的二氧化鈦奈米管陣列應用在水分解上

Abstract

本實驗主要研究利用陽極氧化的電化學方法生長碳摻雜的二氧化鈦奈米管陣列，主要的碳來源為乙二醇和酚，使用10克的去離子水加上0.5克的氟化銨、89.5克的乙二醇、16克的酚，製備後再500 ℃鍛燒兩個小時， 在1M的KOH水溶液中可以得到最高的水分解效率，在單光330 ± 70 nm 及520± 46 nm可以分別得到16.31%及0.068%的水分解效率。由XPS的圖譜可知，碳有著較高的束縛能，而在價帶方面有著特性吸收峰，鈦的束縛能不受到碳的影響，也符合Bader Atomic Charge中的分析，對應到理論計算的結果有著三種可能的碳插入型的結構。

TiO2-xCx nanotube arrays have been grown by anodic oxidation. Two kinds of carbon sources: ethylene glycol and phenol have been employed. The optimum condition for anodization is to employ 10 g DI water, 0.5 g NH4F, 89.5 g ethylene glycol and 16 g phenol with annealing at 500 ℃. Water splitting efficiency was found to be 16.31% at 330 ±70 nm and 0.068% at 520 ± 46 nm. The observed XPS result shows that the higher binding energy of carbon is related to better water splitting efficiency. Besides, there is a unique peak in the valence band which is consistent with the result of quantum chemical (density functional theory) calculations which reveal three possible structures.