异质结
光催化
X射线光电子能谱
兴奋剂
材料科学
电子顺磁共振
化学工程
化学
充电控制
载流子
纳米技术
光电子学
催化作用
工程类
物理
生物化学
功率(物理)
量子力学
电池(电)
核磁共振
作者
Fahim A. Qaraah,Samah A. Mahyoub,Abdo Hezam,Amjad Qaraah,Xin Feng,Guangli Xiu
标识
DOI:10.1016/j.apcatb.2022.121585
摘要
Reasonable construction and engineering of optimal hierarchical photocatalysts have garnered great attention in terms of promoting CO2 photoreduction into fuel production. Herein, we introduce a novel 3D O-doped g-C3N4/N-doped Nb2O5 (OCNNb) S-scheme heterojunction fabricated using control of each material's surface charge-induced heteroaggregation for photocatalytic CO2 reduction (PCR). The optimized sample converts CO2 with substantially greater rates (the sum production rate of CO and CH4) than the blank control, i.e., O-doped g-C3N4 (OCN) and N-doped Nb2O5 (NNBO). The enhanced photocatalytic efficiency can not only be ascribed to the prevention of photogenerated charge carrier recombination mediated by the S-scheme heterojunction but also to the high specific surface areas and abundance of active sites. In the meantime, work function measurement, in situ irradiated, X-ray photoelectron spectroscopy and electron paramagnetic resonance (EPR) studies confirm the S-scheme photogenerated charge transfer mechanism. This study offers a useful approach for fabricating extremely effective heterojunction photocatalysts to convert solar fuels.
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