Polymeric g-C3N4 Coupled with NaNbO3 Nanowires toward Enhanced Photocatalytic Reduction of CO2 into Renewable Fuel
Polymeric g-C3N4 Coupled with NaNbO3 Nanowires toward Enhanced Photocatalytic Reduction of CO2 into Renewable Fuel
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DOI：
10.1021/cs500848f
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发表时间：
2014-10-01
期刊：
影响因子：
12.9
通讯作者：
Zou, Zhigang
中科院分区：
文献类型：
--
作者：
Shi, Haifeng;Chen, Guoqing;Zou, Zhigang
通过在NaNbO3纳米线上引入聚合物g-C3N4，制备了具有可见光响应的g-C3N4/NaNbO3纳米线光催化剂。系统地研究了g-C3N4/NaNbO3复合材料的界面相互作用、电荷转移和分离的微观机理，以及对其光催化活性的影响。高分辨率透射电镜（HR-TEM）显示，在g-C3N4/NaNbO3异质结中，C3N4和NaNbO3纳米线之间形成了紧密的界面。考察了光催化剂在可见光照射下对CO还原的光催化性能。值得注意的是，g-C3N4/NaNbO3复合光催化剂光还原CO的活性高于单相g-C3N4或NaNbO3。这种显著的光催化活性增强主要是由于g-C3N4/NaNbO3异质结亲密界面上光电子空穴对的分离和转移得到了改善，这源于C3N4和NaNbO3良好排列的重叠带结构。
Visible-light-responsive g-C3N4/NaNbO3 nanowires photocatalysts were fabricated by introducing polymeric g-C3N4 on NaNbO3 nanowires. The microscopic mechanisms of interface interaction, charge transfer and separation, as well as the influence on the photocatalytic activity of g-C3N4/NaNbO3 composite were systematic investigated. The high-resolution transmission electron microscopy (HR-TEM) revealed that an intimate interface between C3N4 and NaNbO3 nanowires formed in the g-C3N4/NaNbO3 heterojunctions. The photocatalytic performance of photocatalysts was evaluated for CO, reduction under visible-light illumination. Significantly, the activity of g-C3N4/NaNbO3 composite photocatalyst for photoreduction of CO, was higher than that of either single-phase g-C3N4 or NaNbO3. Such a remarkable enhancement of photocatalytic activity was mainly ascribed to the improved separation and transfer of photogenerated electron hole pairs at the intimate interface of g-C3N4/NaNbO3 heterojunctions, which originated from the well-aligned overlapping band structures of C3N4 and NaNbO3.