Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution

Ma, Peijie ¹Zhang, Xu ¹Wang, Cong ¹Wang, Zhiwei ²Wang, Kaiwen ¹Feng, Yibo ¹Zhai, Yadi ¹Deng, Jiguang ²Wang, Lihua ¹Zheng, Kun ¹Wang, Jiaxing¹

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作者信息

1. Beijing Univ Technol, Fac Mat & Mfg, Beijing Key Lab Microstruct & Properties, Beijing 100124, Peoples R China
2. Beijing Univ Technol, Coll Environm & Energy Engn, Beijing Key Lab Green Catalysis & Separat, Key Lab Beijing Reg Air Pollut Control, Beijing 100124, Peoples R China
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Abstract

Polymeric carbon nitride (C3N4) is a very attractive candidate to produce photocatalytic hydrogen peroxide (H2O2) due to its low-cost, metal-free characteristics. However, the low efficiency would limit its development to higher yields because of insufficient light absorption and electron-hole separation. Here, we developed a simple method to anchor CN quantum dots (QDs) onto g-C3N4 nanosheets to form a homojunction structure (HJ-C3N4), which could improve photocatalytic performance largely without introducing metal elements. Its superior efficiency is a result of the band alignment by the homojunction structure providing excellent electron-hole separation and QDs providing suppressed recombination. Simultaneously, the light responsiveness of QDs endows a wide spectrum-responsive adsorption and enhances the adsorption intensity. The H2O2 yield of the HJ-C3N4 reached 115 mu mol L-1 h(-1) in pure water by visible light, which has an 8.6x higher production than g-C3N4 nanosheets. The material design of 0D/2D homojunction could be extended to other materials with specific band alignment.

Key words

H2O2/Carbon nitride/Quantum dots/Band alignment/Homojunction

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量65

参考文献量56

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