製備摻雜硼、氮與硼氮共摻雜之二氧化鈦奈米管陣列在光催化水解產氫之研究

Synthesis of One-Dimension B-doped、N-doped and B&N- codoped TiO2 Nanotube Arrays and It’s photocatalysticity for Hydrogen Generation

郭明源(Ming-Yuan Kuo)

指導教授 ： 王宏文

中原大學/理學院/化學研究所/碩士(2010年)

https://doi.org/10.6840/cycu201000859

摘要

在本研究太陽光能分解水產氫的裝置中，主要的材料為二氧化鈦奈米管。利用電化學陽極氧化法將純鈦金屬板氧化成高規則方向一致結構之二氧化鈦奈米管。現今的二氧化鈦對光催化的效果侷限在紫外光的範圍，然而紫外光佔太陽光的比例太低。本實驗主要的目的是藉由摻雜的過程，降低二氧化鈦的能階間隙，使光催化的波長移到可見光區，並藉由管狀的結構，使材料的表面積增加，以提升光的繞射與吸收量。在上述的二氧化鈦奈米管陣列上添加Pt、B、N 等元素，改變二氧化鈦奈米管陣列原有之吸收能階。期中摻雜氮的二氧化鈦奈米管陣列能階間隙將低到2.91eV，照AM1.5標準光源後光電流值最大為: 0.303mA/cm2，最高光電轉換效率為1.07%。實際產氫效果在甲醇加水溶液中用紫外光照射試片最佳可達0.75 ml/h．cm2，在純水中則為0.422 ml/h．cm2 ，利用波長為300~500nm汞燈照射則為0.826 ml/h．cm2。利用微波的方法將白金奈米粒子添加在二氧化鈦奈米管陣列中，在700W及120秒微波條件下，所製備的白金奈米粒子為2~5nm，結果測得白金奈米粒子的添加使二氧化鈦奈米管陣列光催化效能增加，照光水解產氫速率為0.579 ml/h．cm2，汞燈則為1.091 ml/h．cm2。

關鍵字

二氧化鈦奈米管 ； 照光水解產氫

並列摘要

Highly-ordered TiO2 nanotube arrays (TNA) by anodizing Ti foil were carried out using a slightly modified electrochemical process. The parameters such as anodization potentials and duration have been varied in order to fabricate the specific length and diameter of TNA. The performance of hydrogen production from photoelectrocatalytic effect of larger diameter TNA is found to be higher than the smaller diameter TNA.
One-Dimensional B-doped, N-doped nanotubes arrays were synthesized via an anodization process. The prepared materials were characterized with field emission scanning electron microscope, and their structures were analyzed by using x-ray diffraction (XRD). A shift of the absorption edge toward the visible region of the UV-vis absorption was be observed. Under ultraviolet (UV) or visible light irradiation, the photocurrent conversion efficiency were enhanced in the TiO2 nanotubes which doped N and B.
Under AM1.5 Standard light, the best photocurrent is N-doped TNA (0.303mA/cm2) , N-doped conversion efficiency is 1.07%, under the UV light the best of hydrogen production rate of these doped TiO2 nanotubes was 0.579 ml/h．cm2 , and under Mercury lamp was 0.826 ml/h．cm2.The Pt nanoparticles were synthesized on the TNA by microwave process at 700W for 120s. The particle size of Pt 2 nm to 5 nm. The experimental results show that the photocatalysis potency of Pt nanoparticles added TNA was batter than TNA blank.

並列關鍵字

photocatalysticity for Hydrogen Generation ； TiO2 Nanotube

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