ACS Applied Energy Materials
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2021
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IF 6.024
Yuyao Zhang,Wen Chen,Min Zhou,Guobin Miao,Yueli Liu
Photoreduction of CO2 into useable hydrocarbon fuels has been widely used in the energy conversion field. However, the high carrier recombination rate and the low conversion efficiency of as-prepared catalysts greatly restrict their photocatalytic application. Herein, we synthesize Ti3C2/CsPbBr3 quantum dot (Ti3C2/CsPbBr3 QD) composites by the method of self-assembly, which are used in the photoreduction of CO2. As a result, Ti3C2/CsPbBr3 QD composites exhibit excellent photocatalytic activity and stability for the photocatalytic CO2 reduction. Especially, the generation rate of CO (17.98 μmol h–1 g–1) for Ti3C2/CsPbBr3 QD composites is 9.37 times higher than that of CsPbBr3 QDs (1.92 μmol h–1 g–1), and 97.35% of the activity is still retained after three consecutive cycles. The improved photocatalytic performance is mainly attributed to the construction of the type II-2 heterojunction as the built internal electric field (IEF) in the p–n junction could accelerate the separation for both photoinduced holes and electrons. Therefore, this work provides an insight into the construction of heterojunction photocatalysts with halide perovskite QD materials for photocatalytic applications.
研究领域:
材料科学
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能源化学
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环境科学
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DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 8
·953
·
IF 2.881
Hongyu Chen,Yunfei Wang,Jianing Wang,Wenyan Liu
Nowadays, the excellent performance of metal halide perovskite quantum dots (PQDs) has been demonstrated, but the stability is still a perplexing issue. In this paper, the CsPbBr3QDs were assembled into SBA-15 for the first time. The thermal stability and photoluminescence (PL) intensity of SBA-15@CsPbBr3QDs were improved. The PL spectra of pure CsPbBr3QDs have red-shift (~6 nm) with the increasing temperature. However, that of SBA-15@CsPbBr3QDs have almost no red-shift. The PL intensity of SBA-15@CsPbBr3QDs decreased slightly after heating and cooling for several times. By comparison, the PL intensity of pure CsPbBr3QDs decreased more significantly. The experimental results showed that SBA-15 played a significant role in improving the thermal stability of PQDs, which will have an excellent potential for the application of PQDs in the future.Keywords:CsPbBr3QDs;SBA-15;thermal stability
研究领域:
材料科学
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光学
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DOI
高影响因子
ChemSusChem
·
2024
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IF 7.5
Dong Li,Kaixuan Wang,Ying Chen,Renyi Li,Jiahong Tang,Yizhou Zhao,Wei Guo,Qi Chen,Yujing Li
Graphical A 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is synthesized by immobilizing CsPbBr 3 (CPB) quantum dots on one-dimensional porous tubular g-C 3 N 4 (TCN). The strong Pb−N chemical bonding between CPB quantum dots and TCN provides a fast charge transfer channel for the CPB@TCN, which promotes the efficient separation and transfer of photogenerated carriers, resulting in excellent photocatalytic activity. Halide perovskite CsPbBr 3 (CPB) quantum dots (QDs) are considered as a promising candidate for solar-driven CO 2 conversion for their unique optoelectronic properties and suitable band structures. However, the CO 2 conversion efficiency of pristine CsPbBr 3 quantum dots is severely limited due to their rapid electron-hole pair recombination and insufficient active sites. In this study, by immobilizing CPB QDs onto one-dimensional (1D) porous tubular g-C 3 N 4 (TCN), an effective 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is fabricated. Density functional theory (DFT) calculations combined with experimental studies demonstrate that CPB QDs are uniformly anchored on the surface of TCN through Pb−N chemical bonding, resulting in efficient separation and transfer of photogenerated carriers in CPB@TCN photocatalysts. The resultant CPB@TCN photocatalysts exhibit significantly enhanced photocatalytic activity for CO 2 reduction with the highest conversion rate of 22.62 μmol g −1 h −1 , which is 5.33-times higher than that of pristine CPB QDs. This work unveils the interfacial bonding mechanism of CPB@TCN heterojunction through Pb−N chemical bond, which provides new insights for the development perovskite-based heterojunction photocatalysts.
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 Materials & Interfaces
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2021
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IF 9.229
Lan Ding,Burenbayaer Borjigin,Yuning Li,Xiaoxue Yang,Xiaojing Wang,Huiqin Li
Conversion of CO2 into valuable chemical feedstocks through artificial photosynthesis is an effective strategy to alleviate energy and environmental issues. Herein, we have developed a novel perovskite-based catalyst via in situ growing CsPbBr3 quantum dots (QDs) on the affinal 2D CsPb2Br5 nanosheets for CO2 photoconversion. CsPbBr3 QDs were generated by peeling off layers from their cubic counterpart; meanwhile, CsPb2Br5 nanosheets were formed by heaping up the peeled layers. The resultant dual-phase composite exhibited outstanding activity and selectivity for photocatalytic conversion of gaseous CO2 with a CO generation rate of 197.11 μmol g–1 h–1 under 300 W Xe lamp irradiation, which is 2.5 and 1.1 times higher than that of pure CsPb2Br5 or CsPbBr3. Importantly, the fabricated dual-phase material presented extremely high stability and was able to maintain an unchangeable CO2 conversion rate under wet air in the consecutive 10 h of recycling test. Furthermore, attributing to the in situ assembling strategy, the close contact allowed photo-generated electrons in CsPbBr3 QDs to transfer rapidly to CsPb2Br5, and the affluent active sites in such an architecture enabled achieving enhanced CO2 photoconversion activity. The present work provides an attractive approach for in situ constructing a consubstantial perovskite-based composite photocatalyst to ensure great stability and excellent activity for artificial photocatalytic CO2 conversion.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Zhenwei Zhang,Junkai Zhang,Yixing Zhao,Yanli Wan,Sen Li,Yingwen Tang,Tao Li,Tingfang Tian,Li Wang
All-inorganic halide perovskite quantum dots are widely known to suffer luminescence degradation owing to their intrinsic instability in atmospheric circumstances. Their high surface energy and weak internal ionic bonding could result in quantum dot agglomeration and structural degradation. In this work, we demonstrate that triallylamine is an efficient recovery agent to reignite the luminescence emission of aged CsPbBr 3 quantum dots. The aged CsPbBr 3 quantum dots re-emit bright green light instantly after triallylamine etching. The X-ray photoelectron spectroscopy results indicate a noticeable decrease of surface under-coordinated Pb ions content, leading to surface re-healing and photoluminescence quantum yields increasing. The unique emission recovery could reveal the details of CsPbBr 3 quantum dot surface variety and facilitate the development of perovskite quantum dot display devices.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
Advanced Optical Materials
·
2024
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IF 8
Xingyi He,Tianfeng Li,Zifan Liang,Renming Liu,Xia Ran,Xiaojuan Wang,Lijun Guo,Caofeng Pan
The emission of cyan light (470-500 nm) plays a vital role in the visible light spectrum and is essential for applications such as lighting, displays, and optical communication. Inorganic cesium lead bromide perovskite quantum dots (CsPbBr 3 PQDs) have made significant progress in the field of luminescence materials and devices, however, the lack of techniques to obtain highly emissive and stable cyan-emitting CsPbBr 3 PQDs has limited their device applications. Here, it is demonstrated that the complete surface passivation by treatment of didodecyldimethylammonium bromide (DDAB) and lead bromide, which can enhance the photoluminescence and stability of cyan emitting CsPbBr 3 PQDs. In particular, the photoluminescence quantum yield of CsPbBr 3 QDs can be greatly improved from 10.5% to 83.8%. Through an effective PMMA passivation, the obtained stable and bright CsPbBr 3 PQDs composite films as the cyan color converters can effectively emit the cyan light to fill the “cyan gap” of white light-emitting diode (WLED). The color rendering index value of such WLED is remarkably enhanced from 73.6 to 82.5. This study paves the way for the application of PQD color converters in the next generation of full-visible-spectrum WLED lighting.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2023
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IF 5.2
Zhousu Xu,Yijian Yang,Peng Wang,Xiaofeng Liu,Jianrong Qiu
Nd 3+ co-doped CsPbBr 3 perovskite quantum dots (PQDs) glasses were prepared by conventional melt-quenching followed by a thermal treatment process. With the introduction of Nd 2 O 3 to the parent glass, the optical properties of the CsPbBr 3 PQDs are significantly improved. The energy transfer from CsPbBr 3 PQDs to Nd 3+ ions was investigated and confirmed by excitation and emission spectra. The results show that visible excitation band width for the near-infrared (NIR) emission of Nd 3+ ions is significantly increased in the presence of PQDs. The strategy for modulation of the optical properties by the energy transfer between rare earth ions and PQDs in the glass matrix could be further utilized for spectral engineering of photonic glasses for optoelectronic applications.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
ACS Applied Nano Materials
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2025
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IF 5.5
Jingyi He,Shimin Liu,Jianmin Gu,Shiqing Xu
All-inorganic lead halide perovskite quantum dots (CsPbX3 QDs, X = Cl, Br, I) glass has elicited extensive attention due to its excellent stability. However, the realization of CsPbX3 QDs glasses with a high photoluminescence quantum yield (PLQY) remains a challenging task. In this study, Eu3+ ions act as nucleating agents to promote the formation and crystallization of CsPbBr3 QDs. Rb+ ions further improve the crystallization quality and reduce the defects between CsPbBr3 QDs and the glass interface. The codoping of Eu3+ and Rb+ ions greatly improved the PLQY of CsPbBr3 QDs. The highest PLQY is achieved in the 0.33Rb-2Eu heat-treated at 500 °C–6 h, reaching 54%. Furthermore, among the light-emitting diodes (LEDs) prepared with 1Cs-0Eu, 1Cs-2Eu, or 0.33Rb-2Eu, 0.33Rb-2Eu has the highest color gamut coverage (108.9% of the National Television Standards Committee color gamut and 92.7% of Rec. 2020 color gamut at 20 mA) and the strongest durable high-power driving capability, making it an ideal material for green LEDs.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Guobin Miao,Min Zhou,Yuyao Zhang,Zifan Yang,Yueli Liu
Photocatalytic CO 2 reduction has attracted extensive attention because of its abilities to generate renewable clean fuels while immobilizing CO 2 . However, the widely used CO 2 reduction photocatalysts generally have the problems of inadequate light absorption performance and insufficient photocatalytic reaction yield. Here we report 0D/2D CsPbBr 3 quantum dot/CuCo 2 O 4 nanosheet composites (CsPbBr 3 QD/CuCo 2 O 4 NS composites) synthesized by mechanical mixing method, which are applied for photocatalytic CO 2 reduction. Thanks to the narrow bandgaps of CsPbBr 3 QD and CuCo 2 O 4 NS, CsPbBr 3 QD/CuCo 2 O 4 NS composites represent strong light absorption performance. The p-n heterojunction forms between CsPbBr 3 QD and CuCo 2 O 4 NS obviously boosts the charge separation, leading to the photocatalytic activity and stability of CsPbBr 3 QD/CuCo 2 O 4 NS composites significantly exceeding that of CsPbBr 3 QD and CuCo 2 O 4 NS. After 5 h of photocatalytic reaction, the generation rate for CH 4 of CsPbBr 3 QD/CuCo 2 O 4 NS composites is 285.93 μmolg −1 , which is about 3.2 times and 9.2 times higher than CsPbBr 3 QD (88.08 μmolg −1 ) and CuCo 2 O 4 NS (30.92 μmolg −1 ), respectively. This work provides a new insight to construct novel heterojunction photocatalysts based on lead halide perovskite QD, which shows the enhanced photocatalytic activity and light absorption performance.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
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IF 4.4
Xianju Zhou,Qianyang Chang,Guotao Xiang,Sha Jiang,Li Li,Xiao Tang,Faling Ling,Yongjie Wang,Jingfang Li,Zhen Wang,Xuecong Zhang
Light-emitting perovskite quantum dots (PeQDs) are extensively investigated owing to their evident merits. However, it is still a challenge to adjust their intrinsic emissions and enhance their thermal stability to achieve full-color highly emissive QD-based light-emitting diodes (QLEDs), especially blue QLEDs. Herein, we demonstrate an effective strategy to fundamentally stabilize the crystal structure of CsPbBr 3 QDs by codoping Na + and Cu 2+ ions, which are designed to substitute Cs + (A sites) and Pb 2+ (B sites), respectively. It is found out that the codoping metal ions have significantly improved the thermal stability and the optical properties of the QDs. 40% of the emission intensity can be remained after 8 thermal cycles (20–120 °C) for CsPbBr 3 : Na + /Cu 2+ QDs, whilst less than 10% is maintained for undoped CsPbBr 3 QDs. Accordingly, stable blue QLEDs are packed by CsPbBr 3 : Na + /Cu 2+ QDs. Strong electroluminescence with the maximum luminance of 7161 cd m −2 and low turn-on voltage of 2.4 V are realized. The CIE coordinates are tuned from green (0.10, 0.74) to blue (0.17, 0.25) via Na + and Cu 2+ codoping. The maximum external quantum efficiency (EQE max ) is obtained as 4.52% for PeLEDs based on codoped QDs. The proposed metal ions A and B sites dual substitution strategy guarantees PeQDs as an extremely promising prospect in potential applications as high-resolution displays and high-quality lightings.
研究领域:
材料科学
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光电材料
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纳米技术
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Zhentong Lu,Zhiqiang Tang,Haoran Zhang,Wei Li,Jianle Zhuang,Chaofan Hu,Yingliang Liu,Bingfu Lei,Xuejie Zhang
In situ precipitation of CsPbBr 3 quantum dots within glass (CsPbBr 3 QDs@galss) is considered as one of the effective methods to overcome their instability and achieve practical applications. However, challenges such as low photoluminescence quantum yield (PLQY), poor thermostability and photostability still persist. Herein, we modulated the rigidity of the glass network structure by adjusting the SiO 2 content in the phosphate glass matrix. This strategy allowed us to successfully fabricate CsPbBr 3 QDs@glass composites with excellent crystallinity and luminescence properties. This composite exhibits a narrow-band emission at 515 nm with a remarkable PLQY up to 72 % under 455 nm excitation, 1.7 times higher than that of unintroduced SiO 2 . Moreover, it retains approximately 30 % of its initial luminescence intensity even at a high temperature of 373 K. Meanwhile, the fabricated green LED maintains its luminescence intensity at about 93 % of the initial value after 120 h of continuous operation. To demonstrate its conceptual application, an LCD screen was also assembled using a white LED lighting strip based on CsPbBr 3 QDs@glass that shows outstanding color reproduction and color saturation.
研究领域:
材料科学
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光学工程
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显示技术
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DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 9
·e2315956121
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IF 9.4
Chenyu Du,Jianping Sheng,Fengyi Zhong,Ye He,Huiyu Liu,Yanjuan Sun,Fan Dong
Photo-catalytic CO2 reduction with perovskite quantum dots (QDs) shows potential for solar energy storage, but it encounters challenges due to the intricate multi-electron photoreduction processes and thermodynamic and kinetic obstacles associated with them. This study aimed to improve photo-catalytic performance by addressing surface barriers and utilizing multiple-exciton generation in perovskite QDs. A facile surface engineering method was employed, involving the grafting of ferrocene carboxylic acid (FCA) onto CsPbBr3 (CPB) QDs, to overcome limitations arising from restricted multiple-exciton dissociation and inefficient charge transfer dynamics. Kelvin Probe Force Microscopy and XPS spectral confirmed successfully creating an FCA-modulated microelectric field through the Cs active site, thus facilitating electron transfer, disrupting surface barrier energy, and promoting multi-exciton dissociations. Transient absorption spectroscopy showed enhanced charge transfer and reduced energy barriers, resulting in an impressive CO2-to-CO conversion rate of 132.8 μmol g−1 h−1 with 96.5% selectivity. The CPB-FCA catalyst exhibited four-cycle reusability and 72 h of long-term stability, marking a significant nine-fold improvement compared to pristine CPB (14.4 μmol g−1 h−1). These results provide insights into the influential role of FCA in regulating intramolecular charge transfer, enhancing multi-exciton dissociation, and improving CO2 photoreduction on CPB QDs. Furthermore, these findings offer valuable knowledge for controlling quantum-confined exciton dissociation to enhance CO2 photocatalysis.
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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PubMed
高影响因子
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