The development of efficient and highly selective photocatalysts is a key point for the photocatalytic conversion of CO₂. In this paper, a composite catalyst UiO-66-NH₂/Ce(HCOO)₃ (simplified to UNH/Ce(HCOO)₃) was fabricated by one pot method with CeCO₃OH as the precursor. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) characterizations results confirmed that UNH was dispersed on the surface of Ce(HCOO)₃ and strongly interacted with it via Ce-N bond. The yield of CH₄ on the optimal UNH/Ce(HCOO)₃ catalyst reached 3 times of that on pristine UNH, up to 128.81 μmol g⁻¹, with the CH₄ selectivity of 71.9 %, and the R_electron reached 286.46 μmol g⁻¹ h⁻¹. The UV–vis diffuse reflection spectra and photoelectrochemical tests results confirmed that the improved photocatalytic CO₂ reduction performance and high CH₄ selectivity could be attributed to the formation of the type-Ⅱheterojunction of UNH/Ce(HCOO)₃ with abundant Ce³⁺, which expanded the visible light absorption range, accelerated the separation and transfer rates of photogenerated charges, and thus efficiently promoted the multi-electron reduction reaction of CO₂ to CH₄. In addition, the reaction temperature affected profoundly the cycle performance of the catalyst. The results presented here illustrated the possibility for improving the stability of UNH/Ce(HCOO)₃-1.80 by decreasing reaction temperature.

_{开发高效、高选择性的光催化剂是CO 2}光催化转化的关键。本文以CeCO ₃ OH为前驱体，采用一锅法制备了复合催化剂UiO-66-NH ₂ /Ce(HCOO) ₃（简化为UNH/Ce(HCOO) _{3 ）。}扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)表征结果证实UNH分散在Ce(HCOO) ₃的表面并与强相互作用通过Ce-N键与它。最佳UNH/Ce(HCOO) ₃上的CH _4产率催化剂达到原始UNH的3倍，达到128.81 μmol g ^-1，CH ₄选择性为71.9 %，R_电子达到286.46 μmol g ^-1 h ^-1。UV-vis漫反射光谱和光电化学测试结果证实，光催化CO ₂还原性能的提高和CH ₄的高选择性可归因于UNH/Ce(HCOO) ₃与丰富的Ce ^{3+形成Ⅱ型异质结。}，扩大了可见光吸收范围，加快了光生电荷的分离和转移速率，从而有效地促进了CO ₂到CH ₄的多电子还原反应。此外，反应温度对催化剂的循环性能影响很大。这里给出的结果说明了通过降低反应温度来提高 UNH/Ce(HCOO) _{3 -1.80 稳定性的可能性。}