在此研究中，製備出p-氧化亞銅/ n-二氧化鈦異質接面光觸媒，並將其成功應用於光催化還原反應，本研究利用還原六價鉻來測試光觸媒光催化還原的能力。
本研究使用n型半導體-二氧化鈦為載體，在外面成長氧化亞銅，接著我們嘗試使用各種方式去提升其光催化還原能力，包含：調整複合重量百分比、改變製程溫度以及加入第三成份等等，去提升光觸媒光催化還原能力。後續利用XRD、SEM、TEM、XPS以及UV-Vis去探討光觸媒本身材料的各種性質。
最後我們希望能把綜合以上擁有最佳光催化還原能力的光觸媒粉體應用於光催化水裂解產氫領域上。
研究發現，使用20 mg室溫下製備的30 wt.% Cu2O/ TiO2經過90分鐘可見光的照射下，可以將10 ppm K2Cr2O7 100 mL還原效果達到95%以上，以後將會使用此一材料進行光催化裂解水產氫實驗。

In this research, we prepared the heterojunction p-Cu2O/ n-TiO2 composite photocatalyst and successfully used it on photocatalytic reduction that using reduction Cr6+ to test its photocatalytic reduction ability.
This research used n-type TiO2 as a substrate, then coated Cu2O on TiO2. In order to increase its photocatalytic reduction ability, we tried to adjust Cu2O wt.% of Cu2O/ TiO2, change the temperature of preparation and coat with the third kind of nanomaterials and so on. In addition we analyzed its characteristics by XRD, SEM, TEM, XPS and UV-Vis.
Finally, we chose the photocatalyst with the best ability in Cr6+ photocatalytic reduction for producing hydrogen by photocatalytic water splitting.
In this study, we found using room temperature-30 wt.% Cu2O of Cu2O/ TiO2 20 mg can reduce 10 ppm 100 mL K2Cr2O7(aq) under visible light during 90 min.

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