JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Gao-yu Zhao,Shan Hu,Shu-chang Luo,Juan Lei,Yanfen Wei
To examine the electronic effect of substituents on the photocatalytic performance of PhC 2 Cu, two organometallic photocatalysts with either an F-atom (4F-P) or a CH 3 -group (4CH 3 -P) substituent at the phenyl ring para position were prepared by a facile one-step aqueous-phase method. Density functional theory calculations of the three organometallic photocatalysts (4F-P, P and 4CH 3 -P) revealed the substituent electronic effect on the frontier orbital energies and on the charge density at the Cu + ion. This study indicates that the introduction of the strongly electron-withdrawing F atom facilitates the effective separation of the photo-generated charge carriers, while the introduction of the electron-donating CH 3 group inhibits it. Consequently, the 4F-P photocatalyst exhibits greater photo-degradation activity compared to 4CH 3 -P and unsubstituted P. This investigation has shown that the introduction of a strongly electron-withdrawing substituent group is an effective strategy to improve the photocatalytic activity.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Yishun Wang,Yufeng Zeng,Zili Lin,Xiaoyu Zhang,Yu Chen,Ping Chen,Wenying Lv,Guoguang Liu
For this work, a novel heterogeneous PhC 2 Cu/ZnO, function of facilitating unidirectional exciton transport, was successfully constructed. Leveraging ZnO’s robust electron transfer capability, highly efficient delocalization of photogenerated electrons, and rapid separation of photogenerated carriers from PhC 2 Cu was achieved, leading to improved photocatalytic performance. Remarkably, the addition of just 5 % ZnO enhanced the photocatalytic degradation ability of ciprofloxacin (CIP) by 4.24 times (15 min, 95.2 %). In addition, the issues related to the wide bandgap and photocorrosion of ZnO were effectively circumvented through our designed strategy. Meanwhile, the electron delocalization effect within PhC 2 Cu enhances its molecular stability, which in turn improves the photocatalyst’s performance and long-term recyclability. Moreover, the impact of different ZnO morphologies on exciton transport was systematically investigated, with the core–shell structure identified as most conducive to efficient interface electron transfer. Through in-situ XPS analysis, the exciton unidirectional transport effect was directly demonstrated.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
ACS Applied Energy Materials
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2024
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IF 5.4
Bo Pei,Yinmei Li,Shenhui Ma,Yuyu Bu
The photoelectrochemical (PEC) water splitting performance of Si-based PEC devices is usually restricted by low stability and weak photogenerated carrier transport ability. Herein, a micropyramid array structure (p-SiMPs)/p-Cu2O/PhC2Cu/Pt photocathode device with a p-p-n heterojunction structure is developed. In this tandem PEC device, a p-p heterojunction of p-SiMPs/p-Cu2O is achieved, endowing a higher interface electric field and stronger energy of photoinduced electrons for PEC water reduction. In addition, a stable n-type PhC2Cu protective layer is prepared on the surface of the PEC device by the photoassisted polymerization method, which can improve the stability of PEC water reduction largely. After Pt cocatalytic layer deposition, the p-SiMPs/p-Cu2O/PhC2Cu/Pt tandem photocathode can achieve a saturation photocurrent density of −30 mA/cm2 at −0.9 V (vs RHE) and a photocurrent threshold voltage of −0.1 V for water reduction. This work provides a silicon-based p-p-n heterojunction tandem structure for the PEC water splitting; meanwhile, it indicates that PhC2Cu is a potential material to improve the stability of silicon-based PEC devices.
研究领域:
材料科学
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能源转换技术
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半导体物理
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Jinfan Zhang,Zili Lin,Zongshun Yu,Yudan Zhang,Danluo Liang,Yingyi Chen,Yu Chen,Ping Chen,Haijin Liu,Wenying Lv,Guoguang Liu
For this work, we employed n-type Bi 2 WO 6 and p-type PhC 2 Cu to formulate a direct Z-scheme Bi 2 WO 6 /PhC 2 Cu (PCBW) photocatalyst via simplified ultrasonic stirring technique. An optimal 0.6PCBW composite exhibited the capacity to rapidly photodegrade 2,4,6-TCP (98.6% in 120 min) under low-power blue LED light, which was 8.53 times and 12.53 times faster than for pristine PhC 2 Cu and Bi 2 WO 6 , respectively. Moreover, electron spin resonance (ESR), time-resolved PL spectra, and quantitative ROS tests indicated that the PCBW enhanced the separation capacity of photocarriers. It also more readily associated with dissolved oxygen in water to generate reactive oxygen species (ROS). Among them, the ability of PCBW to produce ·O 2 - in one hour was 12.07 times faster than for pure PhC 2 Cu. In addition, the H 2 O 2 formation rate and apparent quantum efficiency of PCBW are 10.73 times that of PhC 2 Cu, which indicates that PCBW not only has excellent photocatalytic performance, but also has outstanding ROS production ability. Furthermore, Ag photodeposition, in situ X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations were utilized to determine the photogenerated electron migration paths in the PCBW, which systematically confirmed that Z-scheme heterojunction were successfully formed. Finally, based on the intermediate products, three potential 2,4,6-TCP degradation pathways were proposed.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
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