Three-dimensional porous Cu2O with dendrite for efficient photocatalytic reduction of CO2 under visible light
Three-dimensional porous Cu2O with dendrite for efficient photocatalytic reduction of CO2 under visible light
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DOI：
10.1016/j.apsusc.2021.152343
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发表时间：
2022-01-05
影响因子：
6.7
通讯作者：
Xue, Jinbo
中科院分区：
文献类型：
--
作者：
Cui, Lingkai;Hu, Lanqing;Xue, Jinbo
氧化亚铜（Cu 2 O）是一种很有前途的光催化剂，可以在可见光照射下将CO2还原为燃料。但Cu 2 O的快速电子-空穴复合和光腐蚀限制了其光催化性能。为了克服Cu 2 O的这两个缺点，本文采用电沉积结合后续热氧化的方法制备了具有枝晶结构的三维多孔Cu 2 O。220 ℃退火后，三维多孔Cu结构完全转变为Cu 2 O，具有较高的电化学比表面积和良好的光催化CO2还原性能。与无孔Cu 2 O结构相比，3D多孔Cu 2 O表现出2.5倍的光生载流子浓度增加（4.3 × 10（20）cm（-3））和24倍的光催化CO2还原为CO的增强（13.4 nmol cm（-2）h（-1））。特别地，对于3D多孔结构观察到一些C2还原产物。这是因为三维多孔结构提高了CO2气体的传质效率，纳米尺寸的枝晶结构提高了光捕获和光诱导电子传输的效率。此外，光生空穴和电子的快速分离和高反应活性导致了三维多孔Cu 2 O的抗光腐蚀性能。因此，本研究不仅为解决Cu 2 O的活性和稳定性问题提供了新的思路，而且为CO2的光催化还原提供了一种简便的策略。
Cuprous oxide (Cu2O) is a promising photocatalyst that can reduce CO2 to fuel under visible light irradiation. However, the fast electron-hole recombination and photo-corrosion of Cu2O limit its photocatalytic performance. In order to overcome these two shortcomings of Cu2O, in this work, three-dimensional (3D) porous Cu2O with dendrite structure was prepared by electrodeposition combined with subsequent thermal oxidation. The 3D porous Cu structure was completely transformed to Cu2O with 220celcius annealing, which exhibited high electrochemical specific surface area and good photocatalytic CO2 reduction performance. Compared with non-porous Cu2O structure, 3D porous Cu2O demonstrated 2.5 times increment of concentration of photogenerated carriers (4.3 x 10(20) cm(-3)) and 24-fold enhancement of photocatalytic CO2 reduction to CO (13.4 nmol cm(-2)h(-1)). Especially, some C2 reduction product was observed for the 3D porous structure. This is because the 3D porous structure improves the mass transfer efficiency of CO2 gas, and the nano-sized dendrite structure enhances the efficiency of light capture and photoinduced electron transportation. Furthermore, the rapid separation and high reaction activity of photoinduced holes and electrons result in the anti-photocorrosion properties of 3D porous Cu2O. Therefore, this work not only provides new idea to address the activity and stability of Cu2O, but also develops a facile strategy for photocatalytic reduction of CO2.