Liu Xiu, Chen Yajie, Wang Qi, Li Longge, Du Lizhi, Tian Guohui
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, PR China.
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, PR China.
J Colloid Interface Sci. 2021 Oct;599:1-11. doi: 10.1016/j.jcis.2021.04.104. Epub 2021 Apr 21.
Here, we describe the fabrication of surface oxygen vacancy-enriched ZnFeO@TiO double-shell hollow heterostructure nanospheres (ZnFeO@H-TiO) coupled with spatially separated CoO and Au-Cu bimetallic cocatalysts. The ZnFeO@TiO heterojunction and spatially separated dual cocatalysts can significantly promote the separation of photoinduced charge carriers. Combined with the unique hollow double-shell heterostructure characteristics and improved surface state properties, the hybrid nanospheres can efficiently adsorb and activate CO molecules. These advantages cause the optimized catalyst to exhibit remarkably higher gas-phase photocatalytic CO reduction activity than the control CoO/ZnFeO/Au-Cu and ZnFeO@H-TiO double-shell hollow nanospheres loaded with a single cocatalyst. Meanwhile, the Au-Cu bimetal effect boosts the CO conversion rate and CH selectivity. The optimized hybrid catalyst with a Au/Cu ratio of 1:1 provides a CH yield of 21.39 μmol g h with 93.8% selectivity. This work provides a rational photocatalyst design to improve CO conversion and CH selectivity.
在此，我们描述了表面富含氧空位的ZnFeO@TiO双壳中空异质结构纳米球（ZnFeO@H-TiO）的制备，该纳米球与空间分离的CoO和Au-Cu双金属助催化剂相结合。ZnFeO@TiO异质结和空间分离的双助催化剂能够显著促进光生电荷载流子的分离。结合独特的中空双壳异质结构特性和改善的表面态性质，这种混合纳米球能够有效地吸附和活化CO分子。这些优势使得优化后的催化剂在气相光催化CO还原活性方面比对照的CoO/ZnFeO/Au-Cu以及负载单一助催化剂的ZnFeO@H-TiO双壳中空纳米球显著更高。同时，Au-Cu双金属效应提高了CO转化率和CH选择性。Au/Cu比为1:1的优化混合催化剂提供了21.39 μmol g⁻¹ h⁻¹的CH产率，选择性为93.8%。这项工作为提高CO转化率和CH选择性提供了一种合理的光催化剂设计。
