光催化
过电位
材料科学
可见光谱
带隙
电子转移
化学工程
光化学
光电子学
纳米技术
催化作用
化学
物理化学
电化学
电极
有机化学
工程类
作者
Yee Wen Teh,Yien Wei Goh,Xin Ying Kong,Boon‐Junn Ng,Siek‐Ting Yong,Siang‐Piao Chai
出处
期刊:Chemcatchem
[Wiley]
日期:2019-10-29
卷期号:11 (24): 6431-6438
被引量:70
标识
DOI:10.1002/cctc.201901653
摘要
Abstract Photocatalysis has been widely explored to alleviate the high atmospheric CO 2 content by converting CO 2 into energy‐rich fuels. Bi 2 WO 6 shows great potential in photocatalysis due to its high chemical stability, non‐toxicity and appropriate band position. However, the CH 4 yield from CO 2 photoreduction over bulk Bi 2 WO 6 is relatively low ascribed to its single‐component structure. Inspired by natural photosynthesis, Z‐scheme system with photosystem I (PS I)‐photosystem II (PS II) coupling via an electron mediator can improve charge separation and at the same time, renders large overpotential, attributed to the vectorial electron transfer from PS II to PS I. In this contribution, an all‐solid‐state Z‐scheme photocatalyst that is composed of 2D Bi 2 WO 6 nanosheets coupled with WO 3 along with the incorporation of copper foil sheet as the electron mediator is designed to improve the CO 2 reduction efficiency. The Bi 2 WO 6 /Cu/WO 3 composite demonstrated a remarkable CH 4 yield of 8.80 μmol g −1 catalyst over 8 hours of visible light illumination, which is superior to the Bi 2 WO 6 standalone.
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