近年來許多研究指出少層數二硫化鉬在催化產氧方面擁有良好的發展潛力,且二氧化鈦具有光崔化特性。在本論文中我們疊合二硫化鉬與二氧化鈦兩種材料,研究MoS2/TiO2樣品並期待其可提高產氧效果。 在本研究中我們使用水熱法製備出二氧化鈦薄膜在FTO基板上,同時用離子插層法製作出少層數的二硫化鉬。並利用滴定法將二硫化鉬沉積在二氧化鈦薄膜上形成MoS2/TiO2的樣品。最後將上層的二硫化鉬摻雜不同的過度金屬元素以提高產氧的效率。使用拉曼光譜(Raman Spectroscopy)峰值位置判別可以得知我們做出的樣品為1T的二硫化鉬結構和銳鈦礦相(anatase)型態的二氧化鈦薄膜。由於能隙大小對光催化反應非常的重要。因此利用紫外-可見光光譜(Ultraviolet-visible spectroscopy, UV-vis)來量測樣品能隙大小。為了確定摻雜後的結構變化,我們用X光吸收精密結構數據的擬合摻雜過度金屬元素在二硫化鉬上的結構。應用X-ray Diffraction判別是否為銳鈦礦(anatase)晶體結構同時運用Sherrer equation計算出銳鈦礦顆粒大小為7nm。 在產氧分析上我們使用三電極系統電化學分析法,透過線性伏安法(Linear sweep voltammetry)與電化學阻抗頻譜(Electrochemical Impedance Spectroscopy, EIS)來觀察其電化學特性。並且使用鹵素燈的光譜模擬太陽光譜,觀察樣品在照光前後的電流變化。證明摻雜過度金屬元素的二硫化鉬覆蓋在二氧化鈦上時有助於提升產氧催效率。
Recently, few-layered Molybdenum disulfide (MoS2) has received considerable attention due its potential application as a catalyst for oxygen production. On the other hand, titanium dioxide (TiO2) is widely recognized as a good photocatalyst. In this research, we combined them together and studied the synergetic effect for enhanced photocatalytic oxygen production. Titanium dioxide (TiO2) thin films were grown on their substrates using a hydrothermal method. Few-layered MoS2 was prepared by the ion intercalation method. The few-layered MoS2 was then deposited onto TiO2 thin film using a titration method to form the MoS2/TiO2 sample. Cobalt atoms were doped into the MoS2/TiO2 sample by dipping the thin films sample into cobalt chloride solutions. As determined from x-ray diffraction measurements, our thin film samples exhibit anatase polycrystalline TiO2 structure. The crystallite size is around 7 nm as estimated from the XRD data using Scherrer equation. Raman Spectroscopy has been used to identify the 1T molybdenum disulfide structure and anatase TiO2 structure of our samples. Ultraviolet-visible spectroscopy (UV-vis) measurements have been carried out to measure the energy gap of the samples. The XANES and EXAFS analyses were used to probe the valence state and the local environment of the dopant atoms, respectively. Linear sweep voltammetry and Electrochemical Impedance Spectroscopy measurements using a Tripolar electrochemical analyzer were carried out to estimate the electrochemical characteristics of our sample. A halogen lamp was used to mimic the solar light in the photocatalytic activity test. Our experimental results clearly demonstrate that 1T-MoS2/TiO2 has higher catalytic activity than TiO2. With cobalt doping, the catalytic activity can be further enhanced.
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