Self-assembled hierarchical direct Z-scheme g-C3N4/ZnO microspheres with enhanced photocatalytic CO2 reduction performance
Self-assembled hierarchical direct Z-scheme g-C3N4/ZnO microspheres with enhanced photocatalytic CO2 reduction performance
复制标题
自组装分层直接Z型g-C3N4/ZnO微球具有增强的光催化CO2还原性能
DOI：
10.1016/j.apsusc.2018.01.193
复制
发表时间：
2018-05-31
影响因子：
6.7
通讯作者：
Yu, Jiaguo
中科院分区：
文献类型：
--
作者：
Nie, Ning;Zhang, Liuyang;Yu, Jiaguo
光催化还原CO2制备碳氢燃料是缓解温室效应和能源短缺的有效途径。本文采用静电自组装法制备了g-C3 N4/ZnO复合微球。这种方法简单地利用了每个组分的相反表面电荷，实现了它们之间紧密接触的分层结构。得到了更高的光催化CO2还原活性。CH 3OH的生成速率为1.32 μ mol·h（1）·g（1），分别是原始ZnO和g-C3 N4的2.1倍和4.1倍。这种设计赋予了g-C3 N4/ZnO复合材料由多重光散射效应引起的扩展的光吸收。同时也保证了g-C3 N4纳米片在ZnO微球表面的均匀分布，最大限度地发挥了两者的优势和协同效应。最重要的是，提出了卓越的性能，并验证了基于直接Z-计划。重组率受到相当大的抑制。本工作的特点是构建多级直接Z-结构的光催化CO2还原反应的优越性。2018 Elsevier B. V.版权所有。
Photocatalytic reduction of CO2 into hydrocarbon fuels has been regarded as a promising approach to ease the greenhouse effect and the energy shortage. Herein, an electrostatic self-assembly method was exploited to prepare g-C3N4/ZnO composite microsphere. This method simply utilized the opposite surface charge of each component, achieving a hierarchical structure with intimate contact between them. A much improved photocatalytic CO2 reduction activity was attained. The CH3OH production rate was 1.32 mu mol h (1) g (1), which was 2.1 and 4.1 times more than that of the pristine ZnO and g-C3N4, respectively. This facile design bestowed the g-C3N4/ZnO composite an extended light adsorption caused by multi light scattering effect. It also guaranteed the uniform distribution of g-C3N4 nanosheets on the surface of ZnO microspheres, maximizing their advantage and synergistic effect. Most importantly, the preeminent performance was proposed and validated based on the direct Z-scheme. The recombination rate was considerably suppressed. This work features the meliority of constructing hierarchical direct Z-scheme structures in photocatalytic CO2 reduction reactions. 2018 Elsevier B.V. All rights reserved.