锐钛矿
光催化
异质结
材料科学
载流子
石墨烯
可见光谱
半导体
肖特基势垒
氧化物
纳米技术
光电子学
光化学
化学工程
化学
二极管
冶金
催化作用
生物化学
工程类
作者
Hou Wang,Yan Wu,Xiao Tong,Xingzhong Yuan,Guangming Zeng,Wenguang Tu,Shuyang Wu,Heng Yeong Lee,Yong Zen Tan,Jia Wei Chew
标识
DOI:10.1016/j.apcatb.2018.04.012
摘要
Semiconductor-based heterojunctions, widely applied in photocatalytic solar-to-chemical energy conversion, are advantageous for synergistically expediting photocatalytic reaction beyond individual the constituent components. Here we showed new quasi-core-shell In2S3/anatase TiO2@metallic Ti3C2Tx hybrids consisting of well-designed type-II heterojunction and non-noble metal-based Schottky junction with favorable charge transfer channels for efficient photocatalysis application. The mesoporous hybrids owned pleasurable visible-light absorption property and excellent capability in photogenerated exciton separation and carrier transport. Specifically, the hybridized photocatalyst with the additive Ti3C2Tx content of 16 mg (InTi-16) had excellent visible-light photocatalytic performance towards pollutant removal in water with a degradation rate of 0.04977 min−1, which was 3.2 and 6.2 folds higher than that of pure In2S3 and pure Ti3C2Tx, respectively. What’s more, the photocatalytic degradation ability of InTi-16 had surpassed that of many other types of In2S3-based photocatalyst including In2S3/carbon nanotube (CNT), In2S3/reduced graphene oxide (rGO), In2S3/MoS2, and In2S3/TiO2 hybrids. The promising photocatalytic performance was strongly depended on the separation and diffusion of photogenerated exciton and carrier via a multitude of charge transfer channels due to the formation of double heterostructure (type-II heterojunction and Schottky junction). It had originated from the synergistic effects among the visible-light absorption of In2S3, the upward band bending of TiO2 and the favorable electrical conductivity of Ti3C2Tx. Prolonger electron lifetime favored for the generation of more strongly oxidizing radical (e.g. ·O2-) at the in-plane of Ti3C2Tx, and thus enhanced photocatalytic degradation ability. This work demonstrates that the TiO2/Ti3C2Tx can be a potentially novel platform for constructing efficient photocatalysts both for wide-ranging applications and unraveling the transfer behavior of photo-excited electrons based on charge transfer channels.
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