Polymers
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2023
·Vol. 15
·期 20
·4145
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IF 5
Guichuan Xu,Zhuhan Wang,Yefeng Chen,Li Qin,Limei Zhou
Porous carbon nitride/bismuth oxychloride (PCN/BiOCl-x) polymer-based heterojunction photocatalysts were successfully synthesized via a simple in situ hydrothermal method. A PCN/BiOCl heterojunction with rich chlorine defects is prepared by adjusting the chlorine content of the BiOCl unit in the heterojunction by changing the solvent. The as-prepared catalysts were characterized via BET, SEM, TEM, XRD, XPS and optical testing, and they were used for a photocatalytic amine oxidation reaction. The results indicated that the catalytic performance of the PCN/BiOCl heterojunction was significantly enhanced due to the rich chlorine vacancies in the samples. The enhanced catalytic activity may be attributed to the Z-scheme heterojunction, abundant chlorine defects and large specific surface area. At the same time, the catalyst circulation experiment shows that the PCN/BiOCl heterojunction has good circulation performance.Keywords:chlorine vacancy;Z-scheme heterojunction;amine oxidation;polymer-based;photocatalysis
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
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2025
·
IF 6.7
Hao Song,Ziyi Zhang,Yuan Xue,Dawei Wang,Xu Tian,Jie Yu
Low-dimensional lead-free metal halide perovskites have garnered significant attention due to their potential applications in nondestructive testing. However, achieving scintillators that facilitate efficient X-ray imaging remains a major challenge, primarily due to the inherent difficulty of low concentration in deep traps. Here, a novel design strategy is introduced that modulates A-site element occupancy, thereby fine-tuning the electronic structures and photophysical properties of perovskites. We present a novel zero-dimensional halide perovskite Rb 4 CdCl 6 :Mn 2+ , A + (where A + represents Li + , Na + , K + , Ag + ). The trap-regulated generation of additional Cl vacancies significantly enhances the afterglow performance, thereby enabling its applications in high-temperature X-ray imaging, and thermally stimulated imaging. Notably, Na + -doped Rb 4 CdCl 6 :Mn 2+ exhibits optimal trap distribution and superior thermally quenched-resistant radioluminescence, with a light yield 1.4 times higher at 493 K compared to room temperature. Moreover, the prepared film exhibits a detection limit as low as 63.5 nGy s −1 in high-temperature environments, along with a spatial resolution exceeding 20 lp mm −1 . Upon cessation of irradiation, intense X-ray persistent luminescence emission (X-PersL) is triggered under thermal stimulation, realizing delayed imaging, which can be attributed to charge carrier compensation and redistribution mechanisms. This work proposes an innovative design strategy for high-efficiency perovskite scintillators, expanding their applications in advanced X-ray detection.
研究领域:
材料科学
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核医学
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生物医学工程
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医学影像学
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无机功能材料
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辐射探测
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非破坏性检测
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yingyi Nong,Jisong Yao,Jizhong Song
The mixed-halide CsPbCl 3-x Br x perovskite quantum dots (QDs) have emerged as promising candidates for pure-blue light-emitting diodes (LEDs). However, the widely existing defects in these mixed-halide perovskites, arising from uncontrollable crystallization and low Cl vacancy formation energy, significantly restrict the device performance. Herein, a cation-anion pair-assisted synthesis strategy is proposed to obtain high-quality CsPbCl 3-x Br x QDs. Guanidinium sulfate (GA 2 SO 4 ) is introduced during the synthesis process, in which sulfate anions passivate undercoordinated Pb 2+ defects, effectively reducing the non-radiative recombination, and the guanidinium cations interact with halides on the QD surface via hydrogen bonds, inhibiting the formation of Cl vacancy defects. Benefiting from this synergistic passivation effect of the cation-anion pair, the photoluminescence quantum yield of the QDs increases from 42% to 86%. Meanwhile, the QDs exhibit high crystalline quality, which facilitates the transport of charge carriers. Resultantly, the QLEDs achieve a record external quantum efficiency of 24.9% at 470 nm, showing a 1.6-fold improvement over that of the control devices. This work demonstrates that a synergistic ion-pair passivation strategy is a practical design approach for realizing efficient and stable pure-blue perovskite LEDs.
研究领域:
材料科学
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纳米技术
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半导体器件
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光电子学
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凝聚态物理
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无机化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Yan Huang,Yufeng Zhou,Zebin Yu,Shijie Li,Zuofang Yao,Yi Liu,Xinqiu Tan,Yikai Wang,Yanping Hou
To address the bottlenecks of sluggish carrie r separation and insufficient active sites in lead-free halide perovskite of Cs 3 Sb 2 Cl 9 , magnetic transition metal (Co) was introduced and regulated the Co/Sb bimetallic ratio via a facile co-precipitation method to develop the Cs 4 Co 1.2 Sb 1.8 Cl 12 for light-driven CO 2 conversion. Results of electron paramagnetic resonance (EPR), Kelvin probe force microscopy (KPFM) and theoretical calculations revealed that the introduction of Co 2 + could promote the formation of chlorine vacancies ( V Cl ) and enhance local spin polarization, thereby facilitating CO 2 adsorption and activation, as well as accelerating carriers separation. The average carriers lifetime of the Cs 4 Co 1.2 Sb 1.8 Cl 12 was 1.8 times that of pristine Cs 4 CoSb 2 Cl 12 , beneficial to charges participation in CO 2 reduction reaction. The CO yield from the Cs 4 Co 1.2 Sb 1.8 Cl 12 (130.23 μmol·g −1 ·h −1 ) was 1.33 times that of Cs 4 CoSb 2 Cl 12 and 278 times that of pur e Cs 3 Sb 2 Cl 9 . Notably, without sacrificial agent, an unprecedented CO yield of 66.22 μmol·g −1 ·h −1 was achieved in photocatalytic CO 2 reduction, representing the best performance among lead-free halide double perovskites reported to date. In-situ FTIR analysis demonstrated the carboxylate (COOH*) as the dominated intermediate during CO 2 reduction. This work provides a reference for designing efficient lead-free halide perovskite photocatalysts via enriching halide vacancies and strengthening spin polarization for CO 2 conversion.
研究领域:
材料科学
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光催化
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钙钛矿化学
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环境科学
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能量转换
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）