Small
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2023
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IF 13.3
Zhihao Chen,Malik Zeeshan Shahid,Xinyan Jiang,Meng Zhang,Danrui Pan,Hongpeng Xu,Guocan Jiang,Jin Wang,Zhengquan Li
Halide perovskites exhibit outstanding optoelectronic properties, which make them an ideal choice for photocatalytic CO 2 reduction and benzyl alcohol (BA) oxidation. Nevertheless, the simultaneous realization of the above redox coupling reactions on halide perovskites remains a great challenge, as it requires distinct catalytic sites for different target reactions. Herein, the catalytic sites of Cs 2 AgBiCl 6 (CABC) are regulated by doping Fe for efficient coupling of photocatalytic CO 2 reduction and BA oxidation. The Fe-doped CABC (Fe: CABC) exhibits an enhanced visible-light response and effective charge separation. Experimental results and theoretical calculations reveal a synergistic interplay between Bi and Fe sites, where the Bi and Fe sites have lower activation energies toward CO 2 reduction and BA oxidation. Further investigations demonstrate that electrons and holes prefer to accumulate at the Bi site and Fe site under light irradiation, respectively, which creates favorable conditions for facilitating CO 2 reduction and BA oxidation. The resultant Fe: CABC achieves a high photocatalytic performance toward CO (18.5 µmol g −1 h −1 ) and BD (1.1 mmol g −1 h −1 ) generation, which surpasses most of the state-of-the-art halide photocatalysts. This work demonstrates a facile strategy for regulating the catalytic site for redox coupling reactions, which will pave a new way for designing halide perovskites for photocatalysis.
研究领域:
材料科学
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光催化化学
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产品关联
DOI
PubMed
高影响因子
Materials Today Communications
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2024
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IF 3.7
Yudong Xu,Saisai Chen,Mengru Xu,Yaran Wen,Zhenyu Yan,Yuanyuan Yan,Tianyu Zhang,Tong Zhu,Zhixu Qin,Fabao Zhang
A lead-free double perovskite material is being considered as a substitute for lead-based perovskites due to its promising benefits in the photocatalytic degradation of organic dyes. In this study, Cs 2 AgBiCl 6 , a A 2 BB’X 6 -structured halide double perovskite, was prepared by one-step grinding method and hydrochloric acid precipitation method, respectively, and was used to degrade organic dyes in an ethanol solution under visible light. It is shown that the nano-sized Cs 2 AgBiCl 6 sample prepared by the one-step grinding method (Cs 2 AgBiCl 6 -G) can degrade 98 % of Sudan Red III within 10 min, which is highly comparable with the sample prepared using the hydrochloric acid precipitation method (Cs 2 AgBiCl 6 -P). Cyclic experiments demonstrated that Cs 2 AgBiCl 6 -G exhibited superior cyclic catalytic performance compared to the Cs 2 AgBiCl 6 -P samples. In addition, the former also exhibited better photocatalytic degradation for methyl orange, rhodamine B, and methylene blue. This indicates that this facile one-step grinding method can be utilized a large-scale effective preparation technique for producing high yield, eco-friendly, highly efficient and stable Cs 2 AgBiCl 6 photocatalyst.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2024
·
IF 3.8
Hui Wang,Hui Hu,Kevin Homewood,Yun Gao
Double perovskites have shown great potential in addressing the toxicity and instability concerns of lead halide perovskites for practical applications. However, the fabrication of high-quality double perovskite single crystals has remained challenging. Here, large Er-doped Cs 2 AgBiCl 6 single crystals (SCs) with a maximum dimension of 8 mm were successfully prepared using a solution temperature-lowering (STL) method. The photoluminescence (PL) spectra were excited by the lasers with energies below and above the band gap, and the origin of the abnormal PL peaks changing with temperature is explored. The photodetector made from the Er-doped Cs 2 AgBiCl 6 SCs shows a significantly enhanced light responsivity and detectivity in the wavelength range from 370 nm to 660 nm compared with the undoped one, with excellent environmental and radiation stability. It reveals that the Er ions can be successfully doped into double perovskite single crystal, benefiting the application to optoelectronic devices.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2026
·
IF 5.2
Yaran Wen,Yani Yao,Haichuan Bian,Yudong Xu,Mengru Xu,Yaxiao Li,Bo Zhang,Yifei Song,Saisai Chen,Dongdong Li
Al 3+ -added Cs 2 AgInCl 6 and Cs 2 AgBiCl 6 catalysts were prepared by co-precipitation method. It is shown that the incorporation of high concentration of Al 3+ in Cs 2 AgInCl 6 (20% Al 3+ or above) and in Cs 2 AgBiCl 6 (with 50% Al 3+ or above) causes obvious phase separation and formation of secondary phase (AgCl). And the optical bandgaps of Al 3+ -added Cs 2 AgInCl 6 and Al 3+ -added Cs 2 AgBiCl 6 are about 3.5 eV and 2.7 eV, respectively. Benefiting from the enhanced carrier transfer in AgCl/Cs 2 AgInCl 6 heterojunction, Cs 2 AgInCl 6 :0.9Al 3+ exhibits excellent degradation performance for Sudan Red III with a rate above 97% within 16 min and catalytic cycles above 4 times. And Cs 2 AgBiCl 6 :0.7Al 3+ can degrade Sudan Red III at a rate higher than 96% within 14 min. And a new degradation pathway of Sudan Red III in ethanol solutions was proposed firstly. The Al 3+ -added Cs 2 AgInCl 6 and Cs 2 AgBiCl 6 catalysts also exhibit good cyclic and storage stabilities, showing potential applications in the photodegradation of organic pollutants.
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DOI
高影响因子
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