光催化二氧化碳還原不僅可以減少二氧化碳排放，還可以將二氧化碳轉化為高附加值的燃料(如：CO、CH4)，因此，發展一種有效的光催化系統來還原二氧化碳是必要的。具有獨特光電特性(如：高吸收係數、高電荷載流子遷移率、能降低光生電子-電洞對複合率的長電荷擴散長度)的鈣鈦礦光催化劑出現，為高效光催化CO2還原帶來了新的機遇。本篇研究合成CsPbBr3 NPs與摻雜錳CsPbBr3 NPs進行光催化二氧化碳還原反應並透過磁場增強來比較催化效果。摻雜錳離子不僅可以提升材料穩定性還具有磁性特質，主要藉由錳離子的微磁性與外加磁場結合來增強催化反應，使得半導體材料被激發後電荷更有效的分離，來提升光催化二氧化碳還原的效率。本實驗中，先對CsPbBr3 NPs與摻雜錳CsPbBr3 NPs進行光學性質、晶體結構、磁場、形貌等分析，再利用氣相層析儀做光催化分析。最後發現摻雜錳CsPbBr3 NPs在具有外加磁場的情況下，光催化二氧化碳還原出來的CO比無外加磁場的效率多出2倍；皆具有外加磁場時，摻雜錳CsPbBr3 NPs比純的CsPbBr3 NPs還原出5倍的CO及2倍的CH4產率。摻雜錳CsPbBr3 NPs在有外加磁場的光催化二氧化碳還原反應下，促進電荷載流子分離來提高光催化性能有了極大進展。

Photocatalytic carbon dioxide reduction can not only reduce carbon dioxide emissions, but also convert carbon dioxide into high added value fuels (such as CO, CH4). Therefore, it is necessary to develop an effective photocatalytic system to reduce carbon dioxide. The emergence of Perovskite photocatalyst with unique optical and electrical characteristics (such as high absorption coefficient, high charge carrier mobility, long charge diffusion length can reduce the recombination rate of photogenerated electrons and holes), has brought new opportunities for high-efficiency Photocatalytic carbon dioxide reduction (CO2RR). This study performs photocatalytic reduction of carbon dioxide by synthesizing CsPbBr3 NPs and Mn-doped CsPbBr3 NPs and the enhancement of the magnetic field on the reaction system to compare the catalytic effect. Doping with manganese ions can not only improve the stability of the material, but also has magnetic properties. The micromagnetism of manganese ions reacts with the enhancement of the applied magnetic field, so that the charge of the semiconductor material is more effectively separated after being excited, thereby improving the efficiency of photocatalytic carbon dioxide reduction. In this experiment, first analyze the optical properties, crystal structure, magnetic field, morphology of CsPbBr3 NPs and Mn-doped CsPbBr3 NPs, and then use gas chromatograph for photocatalytic analysis. Finally, it find that with an external magnetic field, the photocatalytic CO2RR of CO from the Mn-doped CsPbBr3 NPs is 2 times more efficient than that without an external magnetic field；When all of them have an external magnetic field, compared with pure CsPbBr3 NPs, Mn-doped CsPbBr3 NPs produces 5 times more CO and 2 times more CH4. Mn-doped CsPbBr3 NPs has made great progress in promoting the separation of charge carriers and improving the photocatalytic performance under the photocatalytic CO2RR with an external magnetic field.

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