自工業革命以來，二氧化碳的濃度逐年增加，導致嚴重的環境問題，例如極端的天氣以及海平面上升等問題。而在各種二氧化碳轉化技術中，光催化技術被認為是最有潛力的處理方法之一，可以將二氧化碳轉變成有價值的化學品或燃料。因此，開發高效且穩定的光觸媒應用於光催化反應是非常重要的。本研究透過配體輔助再沉澱的方法製備CsPbBr3和異質結構的CsPbBr3/α-Fe2O3光觸媒，並利用各式的光譜儀器及分析方法，例如X光繞射分析，掃描電子顯微鏡，穿透式電子顯微鏡，X射線光電子能譜儀，紫外光-可見光光譜儀，光致發光光譜儀和二氧化碳吸附測量等來鑑定光觸媒的物化性質。基於配體輔助再沉澱合成方法，透過使用X（X = 1、2、3和4）倍的前驅液體積來改變CsPbBr3的形態和結構，並將所獲得的光觸媒（XCPB）進行光催化還原二氧化碳反應12小時，其中以1CPB的電子消耗率最高，可達到1.42 mmol/g-cat/h，其原因為1CPB擁有最低的能隙值（2.29 eV）、較高的二氧化碳吸附量（0.028 mmol/g-cat）及最好的電子-電洞對分離能力，有利於光催化二氧化碳反應。接著為了進一步提升光觸媒的光催化效能，將不同比例Y（Y = 2、3、4和5 mg）之α-Fe2O3添加到1CPB的前驅液中，並於沉澱於相同體積的甲苯中。將合成的光觸媒（CF-Y）進行光催化反應12小時，其中又以CF-3擁有最佳的光催化活性，其電子消耗速率為3.38 mmol/g-cat/h，是1CPB的2.4倍。經紫外光光電子掃描分析可得到CF-3之費米能階、價帶電位及導帶電位，進而推論CF-3屬於Z型光觸媒結構，且CF-3展現出最好的電子-電洞對分離能力，有利於光還原二氧化碳。此外，本研究還探討不同溫度對CF-3的光還原作用，並且通過阿瑞尼斯方程式來計算CF-3的活化能。

Since the industrial revolution, carbon dioxide (CO2) concentrations have been increased year by year, which lead to serious environment problems, such as extreme weather and sea level rise, etc. Among various CO2 conversion techniques, the photocatalysis is regarded as one of the promising methods for converting CO2 into valuable chemicals or fuels. Therefore, it is important to develop the suitable photocatalysts with high efficiency and stability for the applications in CO2 photocatalytic conversion. In this study, the CsPbBr3 and the heterostructured CsPbBr3/α-Fe2O3 photocatalysts were prepared by a facile ligand-assisted reprecipitation (LARP) method. Furthermore, the properties and morphologies of photocatalysts were identified by XRD, SEM, TEM, XPS, UV-vis, PL and CO2 adsorption measurements. In terms of CsPbBr3, the morphologies and structure are varied by changing the ratios of precursor solution (denoted as XCPB, X = 1, 2, 3 and 4) based on the LARP synthesis method. The obtained samples (named as XCPB) were used as the photocatalysts for carrying out photocatalytic reaction within 12 h. Among all the XCPB samples, the CPB samples display the highest electron consumption rate of 1.42 mmol/g-cat/h, due to the smallest band gap (2.29 eV), the best CO2 uptakes (0.028 mmol/g-cat) and superior separation ability of electron-hole pairs. For the heterostructured CsPbBr3/α-Fe2O3 photocatalysts, the Y (Y = 2, 3, 4 and 5 mg) of α-Fe2O3 was introduced into the CPB precursor solution and reprecipited in toluene. The obtained samples (named as CF-Y) are applied in photocatalytic reduction of CO2 for 12 h. Among the CF-Y, the CF-3 samples show the highest electron consumption rate of 3.38 mmol/g-cat/h, which is ca. 2.4 times of CPB. Furthermore, the Fermi levels (Ef), conduction band edges (ECB) and valance band edges (EVB) of CF-3 samples would be obtained by UPS measurements, which can propose the direct Z-scheme charge pathway in the CF-3 samples. Thus, the CF-3 samples exhibit the surpassing separation ability of electron-hole pairs under the light irradiation, which is favorable to CO2 photo-reduction process. In addition, the different temperatures on the photo-reduction via CF-3 have been discussed in the research, and the activation energy of CF-3 can also be calculated by Arrhenius equation.

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