Enhanced photocatalytic hydrogen peroxide production at a solid-liquid-air interface via microenvironment engineering

被引：40
作者：
Chen, Lei [1 ,2 ]
Li, Shan [1 ,2 ]
Yang, Zhi [1 ,2 ]
Chen, Cheng [1 ,2 ]
Chu, Chiheng [1 ,2 ]
Chen, Baoliang [1 ,2 ]
机构：
[1] Zhejiang Univ, Dept Environm Sci, Hangzhou 310058, Zhejiang, Peoples R China
[2] Zhejiang Prov Key Lab Organ Pollut Proc & Control, Hangzhou 310058, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2022年 / 305卷
关键词：
Photocatalysis; Hydrogen peroxide; Triphase; Microenvironment engineering; Graphitic carbon nitride; GRAPHITIC CARBON NITRIDE; H2O2; PRODUCTION; OXYGEN; WATER;
D O I：
10.1016/j.apcatb.2022.121066
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Photocatalytic oxygen reduction is a promising strategy to generate H2O2 in a low-energy input and more sustainable way. Despite great progress have made in photocatalyst design, the rate-limiting step that poor accessibility of the O-2 to photocatalysts in water remains unexplored. Here, we design a solid-liquid-air triphasic interface over a melamine foam to boost the interfacial O-2 transportation. A Wenzel-Cassie state coexists in a hydrophobic interface and form a tubular confined space with a thickness of 100 mu m, which allows the O-2 directly transferred to the photocatalyst from the air, greatly boost the formation of H2O2. In addition, a tubular confined microenvironment formed on the surface greatly enhances oxygen diffusion, and suppressed the unwanted decomposition of H2O2. This surface microenvironment engineering resulted in a 10-fold enhancement in the photosynthesis H2O2 compared to the traditional solid-liquid diphase system, pinpointing the necessary O-2 mass diffusion for photocatalytic H2O2 generation.
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页数：9
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