Construction of Bi2WO6/RGO/g-C3N4 2D/2D/2D hybrid Z-scheme heterojunctions with large interfacial contact area for efficient charge separation and high-performance photoreduction of CO2 and H2O into solar fuels
Construction of Bi2WO6/RGO/g-C3N4 2D/2D/2D hybrid Z-scheme heterojunctions with large interfacial contact area for efficient charge separation and high-performance photoreduction of CO2 and H2O into solar fuels
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DOI：
10.1016/j.apcatb.2018.08.056
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发表时间：
2018-12-30
影响因子：
22.1
通讯作者：
Tonda, Surendar
中科院分区：
文献类型：
--
作者：
Jo, Wan-Kuen;Kumar, Santosh;Tonda, Surendar
我们合理地构建了一种混合异质结，包括Bi 2 WO 6，还原氧化石墨烯和g-C3 N4（BWO/RGO/CN），具有2D/2D/2D配置，用于有效的光还原产生太阳能燃料。与基础材料（CN）、作为参考的P25以及二元BWO/CN和RGO/CN异质结相比，这些异质结显示出在可见光照射下对CO2还原以产生CO和CH 4的显著改善的性能。特别地，具有Iwt. %的RGO和15 wt.与其它合成的催化剂相比，% BWO在碳质产物（CO + CH 4）的产率方面实现了创纪录的性能，对H-2的选择性为92%。其优异的光催化性能主要归功于其独特的2D/2D/2D结构，该结构在组成材料之间产生了大的界面接触，用于快速电荷转移，以阻止光生电子和空穴的直接复合。值得注意的是，RGO扮演了两个重要的角色：作为一个支持者，以捕获电子从CN，并作为氧化还原介体，以促进Z-方案之间的电荷转移CN和BWO。结果是在本BWO/RGO/CN异质结系统中的电荷分离的更大程度，如由光致发光、光电流响应和电子显微镜结果所证明的。更重要的是，异质结在回收测试过程中显示出优异的稳定性，在CO2的光还原产生CO和CH 4时没有明显的损失。本文提出的这种有趣的界面工程方法为合理设计具有2D/2D/2D结构的新型分层多组分异质结提供了一条有前途的路线，用于环境保护和太阳能转换中的各种应用。
We have rationally constructed a hybrid heterojunction comprising of Bi2WO6, reduced graphene oxide, and g-C3N4 (BWO/RGO/CN) with a 2D/2D/2D configuration for efficient photoreduction to generate solar fuels. These heterojunctions displayed dramatically improved performance towards CO2 reduction to generate CO and CH4 under visible-light irradiation, compared to the base material (CN), P25 as reference, as well as binary BWO/CN and RGO/CN heterojunctions. Particularly, the BWO/RGO/CN heterojunctions with 1 wt. % RGO and 15 wt. % BWO achieved record performance in the yields of carbonaceous products (CO + CH4) compared to other synthesized catalysts, with a selectivity of 92% against H-2. The remarkable photocatalytic performance was mainly attributed to the unique 2D/2D/2D architecture that creates large interfacial contact between the constituent materials for rapid charge transfer, to hinder the direct recombination of photoinduced electrons and holes. Notably, RGO played two significant roles: as a supporter to capture the electrons from CN, and as a redox mediator to promote the Z-scheme charge transfer between CN and BWO. The result is a greater extent of charge separation in the present BWO/RGO/CN heterojunction system, as evidenced by the photoluminescence, photocurrent responses, and electron microscopy findings. More importantly, the heterojunctions displayed excellent stability during recycling tests with no obvious loss in the generation of CO and CH4 from photoreduction of CO2. This interesting interfacial engineering approach presented herein offers a promising route for the rational design of a new class of layered multicomponent heterojunctions with 2D/2D/2D architecture for various applications in environmental protection and solar energy conversion.