正交晶系
光催化
材料科学
相(物质)
单斜晶系
热液循环
分解水
结晶学
化学工程
化学物理
化学
晶体结构
生物化学
工程类
催化作用
有机化学
作者
Manju Kumari Jaiswal,Biswajit Choudhury
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2022-03-10
卷期号:5 (3): 3599-3610
被引量:11
标识
DOI:10.1021/acsanm.1c04267
摘要
Herein, we report the hydrothermal fabrication of hydrated hexagonal (h)/orthorhombic (o) mixed-phase (h-WO3/o-WO3·H2O) core–shell nanoribbons for the photodegradation of methylene blue (MB) under UV, visible, and monochromatic light excitations. The mixed-phase core–shell shows 2–3 times higher photocatalytic activity than the monoclinic (m)-WO3 and h-WO3 crystalline phases. The intercalated water, trap states, and prolonged carrier lifetimes play significant roles in the photocatalytic enhancement of the hydrated mixed phase. These developed nanosystems are rich in oxygen vacancies and show photoabsorption extended up to the near-infrared (NIR) region. Electrochemical spectroscopy revealed a reduced charge-transfer resistance in the mixed-phase compared with other crystalline phases. The underlying mechanism shows that the superiority of the mixed-phase core–shell over other crystalline phases is because of three factors. First, efficient carrier separation at the core–shell and mixed-phase junction; second, intercalated water from the reaction medium and the o-WO3·H2O phase; and third, electron trapping sites. The oxygen defects trap the photogenerated electrons and leave free holes. The tunnel structure of the mixed phase provides intercalation and easy diffusion of water molecules. The intercalated water molecules readily interact with the mobile holes to form hydroxyl radicals for activated photocatalysis. All of these factors contribute to the improved photocatalytic performance of the mixed-phase WO3 nanoribbons.
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