异质结
材料科学
碳纳米管
光催化
氨
化学工程
纳米颗粒
氮化碳
可见光谱
氮化物
纳米技术
光化学
光电子学
化学
催化作用
有机化学
工程类
图层(电子)
作者
Xiang Zhong,Yuxiang Zhu,Qiufan Sun,Meng Jiang,Jingqiu Li,Jianfeng Yao
标识
DOI:10.1016/j.cej.2022.136156
摘要
Tunable CuxO (core–shell structured Cu2[email protected] and CuO) nanoparticles (NPs) are finely loaded on carbon nitride nanotubes (CNNTs) using a facile one-pot method but annealing under different atmospheres. Calcining under H2/Ar (5% H2) ensured a Z-scheme heterojunction of Cu2[email protected]/CNNTs, and core–shell nanostructured Cu2[email protected] NPs in particle size of 20–80 nm are firmly anchored along the nanochannels of CNNTs. Calcining under static air conditions led to a Type II heterojunction of CuO/CNNTs, and larger CuO NPs of ca. 200 nm are on the surface of CNNTs. The effect of the calcination temperature and loading content on the photocatalytic ammonia yield was studied. With the annealing temperature at 400 °C and 9 wt% copper percentage, the resulting Z-scheme Cu2[email protected]/CNNTs exhibit a nitrogen photofixation rate of 1.38 mM gcat–1h−1 with an apparent quantum efficiency of 6.28% at 420 nm, which is about 1.4 and 4.4 times higher than that of CuO/CNNTs and the bare CNNTs, respectively. Introducing Cu2O cores upshifts the band positions of the CuxO NPs, resulting in the formation of a Z-scheme band structure. Comprehensive characterizations reveal that compared to Type II CuO/CNNTs, Z-scheme Cu2[email protected]/CNNTs offer higher N2 chemisorption energy, accelerated charge carrier transfer and increased photoreduction capability. This study provides a reliable and promising route to engineer core–shell structured Z-scheme heterojunctions for enhanced photocatalytic nitrogen fixation.
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