Enhanced Photocatalytic Activity of Direct Z-Scheme K4Nb6O17/Carbon-Rich Melon Heterostructures

IF 6.5 3区 材料科学 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Advanced Sustainable Systems Pub Date : 2024-08-27 DOI:10.1002/adsu.202400352
Celal Avcıoğlu, Aleksander Gurlo, Maged F. Bekheet
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Abstract

Melon (also known as graphitic carbon nitride, g-C3N4) holds promise for photocatalysis, but challenges such as severe charge recombination, low oxidation potential, and sluggish exciton dissociation hinder its performance. Herein, a series of carbon-rich, melon-based photocatalysts are synthesized via one-pot, temperature-induced condensation of urea with the addition of a trace amount of citric acid. The addition of citric acid enhances crystallinity, extends melon chains, increases the C/N ratio, and improves π–π layer stacking of heptazine units, thereby enhancing charge transport properties and visible-light harvesting capacity. These carbon nitride samples are then coupled with molten salt synthesized K4Nb6O17 crystals by a straightforward self-assembly method to construct 2D/2D heterostructure photocatalysts. Z-scheme electron transfer from K4Nb6O17 to the melon samples is established based on their work functions and band edge positions. This efficient charge transfer in the Z-scheme heterostructure facilitates the spatial separation of charge carriers, resulting in a nearly fivefold enhancement in photocatalytic performance compared to the individual constituents.

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增强直接 Z 型 K4Nb6O17/富碳甜瓜异质结构的光催化活性
甜瓜(又称石墨氮化碳,g-C3N4)有望用于光催化,但严重的电荷重组、低氧化电位和迟缓的激子解离等挑战阻碍了其性能的发挥。本文通过添加微量柠檬酸,在温度诱导下一锅缩合尿素,合成了一系列富碳瓜基光催化剂。柠檬酸的加入提高了结晶度,延长了瓜类链,增加了C/N比,并改善了庚嗪单元的π-π层堆叠,从而增强了电荷传输特性和可见光收集能力。然后,这些氮化碳样品通过直接的自组装方法与熔盐合成的 K4Nb6O17 晶体耦合,构建出二维/二维异质结构光催化剂。根据 K4Nb6O17 的功函数和带边位置,建立了从 K4Nb6O17 到甜瓜样品的 Z 型电子转移。Z 型异质结构中的这种高效电荷转移促进了电荷载流子的空间分离,从而使光催化性能比单个成分提高了近五倍。
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来源期刊
Advanced Sustainable Systems
Advanced Sustainable Systems Environmental Science-General Environmental Science
CiteScore
10.80
自引率
4.20%
发文量
186
期刊介绍: Advanced Sustainable Systems, a part of the esteemed Advanced portfolio, serves as an interdisciplinary sustainability science journal. It focuses on impactful research in the advancement of sustainable, efficient, and less wasteful systems and technologies. Aligned with the UN's Sustainable Development Goals, the journal bridges knowledge gaps between fundamental research, implementation, and policy-making. Covering diverse topics such as climate change, food sustainability, environmental science, renewable energy, water, urban development, and socio-economic challenges, it contributes to the understanding and promotion of sustainable systems.
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