陽極氧化法製備二氧化鈦奈米管陣列及其特性研究

Preparation and Characterization of TiO2 Nanotube Arrays by Anoding Process

吳冠霖(Kuan-Lin Wu)

指導教授 ： 謝建德

元智大學/工程學院/化學工程與材料科學學系/碩士(2011年)

摘要

本研究以陽極處理法來製備有序的二氧化鈦奈米管陣列，電解液選擇以NH4F/H2O/ethylene glycol為主。在陽極處理過程中，分別以鉛板及鉑金鈦網來作為對應之陰極，藉由不同溫度、電壓的改變來製備二氧化鈦奈米管，探討其形貌及生長之差異。藉由FE-SEM進行形貌分析，X光繞射儀、紫外光-可見光光譜儀來進行特性分析。另外，利用含浸的方式來製備鉑/二氧化鈦奈米管(鉑觸媒)，並藉由紫外光照射下進行不同鉑濃度之鉑觸媒產氫測試。結果顯示，在恆定電壓(50V)下，以鉑金鈦網為陰極，電解液溫度的提高，二氧化太奈米管的生長速率優於以鉛板為陰極，二氧化鈦奈米管管長分別為16.8 μm、11 μm；恆溫(40℃)狀態下，二氧化鈦奈米管的生長會隨電壓的提高而增加，以鉛板及白金鈦網為陰極，管徑分別由32 nm增大為80 nm、 33 nm增大為83 nm，管長分別由1 μm增長為11 μm、1.7 μm增長為16.8 μm。擔載鉑觸媒產氫測試結果，鉑濃度越低產氫量越大，其中以0.05%的鉑濃度產氫效果最佳，當鉑濃度提升時氫氣的產量反而會下降。

關鍵字

二氧化鈦奈米管 ； 陽極處理 ； 電化學 ； 產氫

並列摘要

The highly ordered TiO2 nanotube arrays were fabricated by using electrochemical anodization in ethylene glycol electrolyte containing 0.3 wt% NH4F and 2 wt% H2O. TiO2 nanotubes were then manufactured under various temperature and anodization potential using plumbum (Pb) plate and platinum (Pt) coated titanium-made (Ti) net as a cathode, respectively. Field emission scanning electron microscopy, X-ray diffraction and UV-visible light spectrum meter were applied to analyze the characteristics of TiO2 nanotubes. Varied concentrations of Pt catalysts on TiO2 nanotubes were implemented by impregnation method. The efficiency of varied Pt catalysts was independently measured by the evaluation of hydrogen production under UV light irradiation. Our results showed that the increase in working temperature facilitated the growth of TiO2 nanotubes at 50V. TiO2 nanotubes were 16.8 μm in length using Pt coated Ti net cathode and 11 μm in length using Pb cathode, respectively. The temperature was controlled at 40℃, TiO2 nanotubes raised from 32 nm to 80 nm in diameter and from 1.7 μm to 16.8 μm in length using Pb cathode when the anodization potential was increased. By contrast, the diameter of TiO2 nanotubes reached from 33 nm to 83 nm and the length increased from 1.7 μm m to 16.8 μm using Pt coated Ti net cathode. The highest efficiency of hydrogen production was found in the TiO2 nanotube substrate with 0.05 % Pt catalyst. On the contrary, the increased concentration of Pt catalyst on TiO2 nanotube resulted in lower hydrogen production.

並列關鍵字

TiO2 nanotubes ； anodization ； electrochemical behavior，Hydrogen productionanodization ； electrochemical behavior，Hydrogen production

參考文獻

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