Although the Z-scheme photocatalysts have high photocatalytic activity, it is difficult to obtain a high proportion of Z-scheme photocatalytic system. In this paper, it is reported for the first time that a high proportion of Z-scheme Er³⁺:Y₃Al₅O₁₂@Nb₂O₅/Pt/In₂O₃ composite photocatalyst can be prepared by coating-demoulding (C-D) method. In this Z-scheme photocatalyst, Pt nanoparticles as conductive channels are fixed between Er³⁺:Y₃Al₅O₁₂@Nb₂O₅ and In₂O₃. Er³⁺:Y₃Al₅O₁₂ as up-conversion luminescence agent can provide enough ultraviolet-lights to activate wide band-gap Nb₂O₅. The as-prepared samples are characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS), fourier transform infrared spectra (FT-IR), photoluminescence (PL) spectra and related electrochemical tests. Further, the effects of heat-treatment temperature, heat-treatment time and used times on the photocatalytic hydrogen production activity of C-D Z-scheme Er³⁺:Y₃Al₅O₁₂@Nb₂O₅/Pt/In₂O₃ composite are studied in detail. The experimental results showed that the photocatalytic activity of C-D Z-scheme Er³⁺:Y₃Al₅O₁₂@Nb₂O₅/Pt/In₂O₃ composite is the highest in photocatalytic hydrogen production when heat-treatment temperature and time are 500 °C and 1.0 h, respectively, and that the high photocatalytic activity can be maintained within four cycles. It can be confirmed that the C-D method can effectively combine different photocatalyst particles in predicted order, greatly enhancing the proportion of highly active Z-scheme photocatalyst particles.

尽管Z方案光催化剂具有高的光催化活性，但是难以获得高比例的Z方案光催化体系。本文首次报道可以通过脱模涂覆制备高比例的Z方案Er ³⁺：Y ₃ Al ₅ O ₁₂ @Nb ₂ O ₅ / Pt / In ₂ O ₃复合光催化剂。 （CD）方法。在这种Z型光催化剂中，作为导电通道的Pt纳米颗粒固定在Er ³⁺：Y ₃ Al ₅ O ₁₂ @Nb ₂ O ₅和In _2之间O ₃。Er ³⁺：Y ₃ Al ₅ O ₁₂作为上转换发光剂可提供足够的紫外光以激活宽带隙Nb ₂ O ₅。所制备的样品的特征在于X射线衍射仪（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），能量色散X射线（EDX）光谱，X射线光电子光谱（XPS），紫外线-vis漫反射光谱（DRS），傅立叶变换红外光谱（FT-IR），光致发光（PL）光谱和相关的电化学测试。此外，热处理温度，热处理时间和使用时间对CD Z-方案Er ³⁺：Y ₃ Al ₅ O ₁₂ @Nb ₂ O ₅ / Pt / In ₂ O ₃的光催化产氢活性的影响复合材料进行了详细研究。实验结果表明，在热处理温度和时间下，CD Z-方案Er ³⁺：Y ₃ Al ₅ O ₁₂ @Nb ₂ O ₅ / Pt / In ₂ O ₃复合材料的光催化活性最高。分别为500°C和1.0 h，并且可以在四个周期内保持较高的光催化活性。可以肯定的是，CD法可以按预测的顺序有效地组合不同的光催化剂颗粒，大大提高了高活性Z型光催化剂颗粒的比例。