ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Hao Wang,Weiwei Lu,Peng Xu,Jie Luo,Kaisheng Yao,Jun Zhang,Xuefeng Wei,Shuge Peng,Haoyan Cheng,Hao Hu,Kunpeng Sun
All inorganic metal halide perovskites (MHPs) have been regarded as a new type of promising photocatalyst for the reduction of CO2. However, due to their strong ionicity and the labile surface ligands, there is still much room for improvement of the stability and efficiency of MHP photocatalysts. Here, we propose a new strategy simultaneously using ionic liquid (IL) as a surface passivation ligand and a precursor to mediate the growth and then stabilize CsPbBr3 MHPs for the photocatalytic reduction of CO2. First, the TEM and XRD results show that the prepared CsPbBr3 has a cubic morphology with the monoclinic phase when the IL of 1-octyl-3-methylimidazolium bromide ([Omim]Br) is used as the surface ligand. When the molar ratio of [Omim]Br to Pb(CH3COO)2 is optimized to 2, the photoluminescence quantum yield of the prepared CsPbBr3 can reach as high as 90.93%, suggesting the effective reduction of surface defects by the IL ligand. Importantly, the CsPbBr3 nanocrystals show high stability under the ambient stimuli of light, heat, and humidity. The subsequent FT-IR and XPS characterizations indicate that the presence of [Omim]Br on the surface of CsPbBr3 increases the Br-rich state, which accounts for the excellent optical property and stability of the CsPbBr3 nanocrystals. Finally, with the assistance of IL as the activator of CO2, the CsPbBr3 photocatalysts provide a high evolution rate of 24.56 and 6.66 μmol g–1 h–1 for CO and CH4, respectively. Multifunctional ILs as passivation ligands, reaction precursors, and CO2 activators provide an efficient pathway to fabricate stable metal halide perovskites for photocatalytic CO2 conversion.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yaofang Zhang,Yingwen Pan,Jian Ni,Zirui Yan,Nanping Deng,Wei Sun,Weimin Kang
Recently, all-inorganic CsPbX 3 (Br, I, CI) perovskites are hot and potential materials which apply to photoelectric device , due to their excellent photoelectric properties such as high carrier mobility , high fluorescence, etc. However, the poor stability greatly restricts their practical applications. In this paper, CsPbBr 3 nanocrystals (NCs) were in-situ encapsulated into PS polymer nanofibers by one step electrospinning with highly uniform size and spatial distribution. The hydrothermal stability of the obtained CsPbBr 3 @PS flexible fiber paper was radically improved with a photoluminescence quantum yield (PLQY) of 66.3%. The PL strength remained 97.2% of the initial value after immersion in water for 10 days. Their PLQY remains above 50% of its original value after heating at 80 °C for 5 h. Due to the excellent optical properties and stability of CsPbBr 3 @PS flexible fiber papers, the detection for rhodamine 6G (R6G) and rhodamine B (RhB) aqueous solution with high FRET value of 24.7% and 21.4%, respectively. Moreover, the minimum detection limit for R6G aqueous solution is 0.005 ppm. This study suggests that the CsPbBr 3 @PS flexible fiber paper is a good candidate for fabricating flexible optoelectronic devices, promising application potentials in lighting and display fields.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Pengyu Su,Yuehao Huang,Yadong Li,Chenguo Hu,Wenbing Shi
With quick development of optoelectronic devices, lead halide perovskite nanocrystals (PNCs) have been extensively researched due to their excellent optoelectronic and luminescent properties. However, the water-induced low stability seriously restricts their applications. In this study, CsPbBr 3 PNCs/polymer composite films are prepared based on even dispersion of PNCs and ultraviolet (UV)-induced chemical crosslinking of methyl methacrylate (MMA) monomers and vinyl silicone oil (VT-PDMS) oligomers . The optimized polymer/PNCs composite film exhibits high photoluminescence quantum yield (PLQY) of 82% comparable to common PNCs, as well as high surface hydrophobicity . This film shows high photoluminescence (PL) intensity (90% of original value) after air aging for 60 days. Its high surface hydrophobicity is attributed to use of VT-PDMS oligomers bearing Si element with low surface energy. Light-emitting-diode (LED) device is constructed employing this optimized composite film, and its color coordinates (0.343, 0.334) is rather close to that of standard white light. Specifically, high PL and surface hydrophobic properties of specimens are simultaneously achieved. The importance of this work can lie in a mild rapid preparation of hydrophobic CsPbBr 3 PNCs/polymer nanocomposites with stable white-light emission for commercial LED devices.
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Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 17
·5098-5110
·
IF 7
Yangwen Hou,Man Dong,Jingting He,Jing Sun,Chunyi Sun,Xiao Li,Xinlong Wang,Zhongmin Su
All-inorganic perovskite (CsPbBr3) nanocrystals (NCs) are exceptional candidates for photocatalysis due to their optimal band structure, high molar extinction coefficient, and long charge-carrier diffusion lengths. However, their inevitable instability and low charge transfer efficiency have prevented their widespread applications. A strategy that can improve both stability and charge separation efficiency is desperately required. Herein, by introducing an in situ structural transformation strategy, hydrophobic hierarchically porous CsPbBr3@Pb-MOF is obtained which exhibits high durability in water for more than 7 weeks and appealing thermal stability and resistance to anion intrusion. Meanwhile, abundant oxygen vacancies are detected which efficiently suppress the photogenerated charge recombination. As a result, impressive CO2 photoreduction activity is achieved with CsPbBr3@Pb-MOF as a catalyst. Through a gas–solid reaction (without sacrificial agents and photosensitizers), this CsPbBr3@Pb-MOF-2 composite exhibits a CO yield of 107 μmol g−1 h−1 with 99.2% selectivity under visible-light (λ > 420 nm) irradiation, surpassing most reported CsPbX3-based photocatalysts under similar conditions.
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Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 2
·1423-1432
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IF 11.806
Xie Kehan,Wei Shijing,Alhadhrami A.,Liu Jie,Zhang Putao,Elnaggar Ashraf Y.,Zhang Feng,Mahmoud M. H. H.,Murugadoss Vignesh,El-Bahy Salah M.,Wang Feijiu,Li Chao,Li Guoqiang
Heterogeneous metal halide perovskites (MHPs) are of great interest in photovoltaic and photocatalytic applications because of their high photon-to-electron conversion efficiency. However, the improvement in the stability of heterogeneous MHP is still a great challenge and has rarely been reported for polar solvent–based photocatalytic applications. Herein, we report a precisely controllable synthesis of CsPbBr 3 /CsPb 2 Br 5 heterogeneous crystals into mesoporous hollow SiO 2 spheres to form the CsPbBr 3 /CsPb 2 Br 5 @SiO 2 yolk-shell microspheres. The composition modulation by simply adjusting the ratio of Cs + and Pb 2+ could result in the perovskite structure evolution from CsPbBr 3 to CsPbBr 3 /CsPb 2 Br 5 and CsPb 2 Br 5 . The prepared CsPbBr 3 /CsPb 2 Br 5 @SiO 2 were dispersed in the aqueous rhodamine B solutions and exhibited higher photocatalytic activities than the commercial TiO 2 (P25). The improvement in the photocatalytic efficiency is mainly caused by the formation of heterogeneous CsPbBr 3 /CsPb 2 Br 5 to boost the spatial charge separation efficiency. Graphical abstract
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 19
·2200571
·
IF 6.389
Tingyu Yang,Yihua Zhu,Xiaoling Yang,Jianhua Shen
Perovskite quantum dots (PQDs) have attracted widespread attention in optoelectronic fields due to their excellent optical properties. However, their instability issue hampers their further development and practical application. Herein, CsPbBr 3 PQDs embedded in mesoporous SiO 2 microspheres (CsPbBr 3 PQDs/MSs) are prepared by the high-temperature solid-phase melting method due to the confinement effect. The prepared CsPbBr 3 PQDs/MSs are treated by saturated Na 2 SO 4 to form PbSO 4 precipitation to fulfill the mesoporous gap. And such treatment endows the QDs with excellent water, light irradiation, and heating stability. The prepared products can maintain over 80% of the original fluorescence intensity even when it is immersed in water for 2 weeks. The CsPbBr 3 PQDs/MSs are utilized in the white light-emitting diode device with Commission Internationale de L'Eclairage color coordinates of (0.3407, 0.3357) at 20 mA, and exhibit excellent photo stability at high power.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 21
·13210-13216
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IF 3.945
ChunWei Zhou,Yu Huang,YinLong Zhang,Bin Lu,YiFeng Xu,QuanLin Ye,XuXin Yang,JianQiang Zhong,Jian-Xin Tang,HongYing Mao
The booming growth of all inorganic cesium lead halide perovskites in optoelectronic applications has prompted extensive research interest in the fabrication of ordered nanostructures or microarrays for enhanced device performances. However, the high cost and complexity of commercial lithographic approaches impede the facile fabrication of perovskite microarrays. Herein, CsPbBr3 microarrays with tunable periodicities have been fabricated using a self-assembled polystyrene nanosphere template and a co-evaporation method. The periodicity of CsPbBr3 microarrays is precisely manipulated by simply modifying the size of polystyrene nanospheres. These microarrays are beneficial for light harvesting, leading to better light absorption ability and prolonged photoinduced carrier lifetime. The longest average carrier lifetime of 58.3 ns is obtained for CsPbBr3 microarrays with a periodicity of 1.0 μm. More importantly, the periodic structures of CsPbBr3 microarrays result in a tunable density of emitter tips in field emission devices. Compared to compact CsPbBr3 films, a 68.2% decrease of the turn-on field is observed for CsPbBr3 microarrays when the periodicity is 150 nm. The higher density of emitter tips leads to larger local field enhancement, and hence the largest field enhancement factor of 3346.6. Finally, a good emission current stability for CsPbBr3 microarray-based field emission devices has been demonstrated.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 9
·5374-5383
·
IF 4.682
Qin Wenjing,Zheng Kai,Liu Hengchao,Chu Jingting
The CsPbBr 3 /Cs 4 PbBr 6 perovskite composite material has received wide attention due to its good stability and photoelectric properties, and it is promising to appear in various photoelectric applications. However, there are still some challenges in how to control the synthesis of this material and obtain the balance between high fluorescence efficiency and well stability. In this study, we proposed a rapid anti-solvent vapor-assisted method to prepare CsPbBr 3 /Cs 4 PbBr 6 microcrystals (MCs) with hexagonal tower structure. It is found that oleic acid and oleamine can effectively control the morphology, grain size and optical properties of the material. This unique hexagonal tower structure CsPbBr 3 /Cs 4 PbBr 6 MCs has excellent optical properties, showing strong green emission at 514 nm and PLQY of 78.4 ± 4.3%, with a narrow full width at half maximum value of 20 nm. In addition, environmental stability experiments have shown that after 6 months of storage under 50% relative humidity, the PL strength loss is lower than 20%. Graphical Abstract
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 8
·1-8
·
IF 5.7
Huang Feng,Deng Lei,Wang Tingting,Zhang Aomei,Yang Minghui,Hou Yi
A bovine serum albumin (BSA)-assisted ultrasonication strategy was developed for the synthesis of CsPbBr 3 nanocrystals (NCs) with stable fluorescence properties in aqueous solution. Such a preparation method is simple, fast and does not require complex equipment. The results show that the synthesized CsPbBr 3 NCs are homogeneous in particle size and have good solubility and stability in water. The CsPbBr 3 NCs have been utilized as fluorescence probe for rapid detection of hydrogen sulfide (H 2 S) in human serum. The reaction of H 2 S with the lead sites on the surface of CsPbBr 3 NCs produces lead sulfide (PbS), resulting in the decrease of fluorometric intensity of CsPbBr 3 NCs. Our designed fluorescent assay has a linear S 2− detecting range of 10 ~ 800 nM with a detection limit of 7.05 nM. The assay was used to determine H 2 S in human serum with spiked recoveries ranging from 94.98% to 102.69%. This work opens new avenues for the application of halide lead perovskite in different biosensing areas. Graphical abstract
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JOURNAL OF CHEMICAL PHYSICS
·
2021
·Vol. 155
·期 23
·
IF 3.488
Cao Jianfei,Yin Zuodong,Pang Qi,Lu Yuexi,Nong Xiuqing,Zhang Jin Zhong
In this work, we demonstrated an in situ approach for doping CsPbBr 3 nanocrystals (NCs) with In 3+ and Cl − with a ligand-assisted precipitation method at room temperature. The In 3+ and Cl − co-doped NCs are characterized by the powder x-ray diffraction patterns, ultraviolet–visible, photoluminescence (PL) spectroscopy, time-resolved PL (TRPL), ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy, and transmission electron microscopy. Based on PL and TRPL results, the non-radiative nature of In 3+ -doping induced localized impurity states is revealed. Furthermore, the impact of In 3+ and Cl − doping on charge transfer (CT) from the NCs to molecular acceptors was investigated and the results indicate that the CT at the interface of NCs can be tuned and promoted by In 3+ and Cl − co-doping. This enhanced CT is attributed to the enlarged energy difference between relevant states of the molecular acceptor and the NCs by In 3+ and Cl − upon co-doping. This work provides insight into how to control interfacial CT in perovskite NCs, which is important for optoelectronic applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xiaoyang Yue,Lei Cheng,Jiajie Fan,Quanjun Xiang
Heterojunction construction is a universal and effective approach to achieve high-efficiency photocatalysts. Towards these well-designed heterojunctions, modulation on steering dynamic charge transfer holds great promise in further performance stimulation. Herein, 2D/2D BiVO 4 /CsPbBr 3 S-scheme heterojunctions, of which CsPbBr 3 nanosheets (NSs) are in-situ face-to-face grown onto BiVO 4 NSs, are designed as cornerstones for further carrier managements. Briefly, with controllable heterostructure regulation, an intimate heterointerface between BiVO 4 and CsPbBr 3 NSs with similar size can be obtained accompanied with a maximally intensified interfacial interaction, largely boosting charge transfer across the interfacial conjunction. Moreover, by further tailoring the intrinsic O vacancy ( V O • • ) of BiVO 4 , the gradient Fermi level shift towards its valence band is finely tuned, yielding an enlarged Fermi level gap and an enhanced internal electric field (IEF) over BiVO 4 /CsPbBr 3 heterojunctions. Such an intensified IEF provides a powerful driving force for directional charge migration, resulting in high charge separation and utilization efficiency. Hence, the optimized BiVO 4 /CsPbBr 3 S-scheme heterojunction features desirable accelerated dynamic carrier mobility, delivering comparably high CO 2 -to-CO conversion with a turnover number (TON) near 230 without any co-catalyst or sacrificial agent. The accelerated S-scheme charge transfer mechanism is revealed in detail by X-ray photoelectron spectroscopy (XPS), theoretical calculations, photo-irradiated Kelvin probe force microscopy and in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS).
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Energy & Environmental Materials
·
2023
·
IF 15
Zhaorui Wen,Chao Liang,Shengwen Li,Gang Wang,Bingchen He,Hao Gu,Junpeng Xie,Hui Pan,Zhenhuang Su,Xingyu Gao,Guo Hong,Shi Chen
Two-dimensional materials have been widely used to tune the growth and energy-level alignment of perovskites. However, their incomplete passivation and chaotic usage amounts are not conducive to the preparation of high-quality perovskite films. Herein, we succeeded in obtaining higher-quality CsPbBr 3 films by introducing large-area monolayer graphene as a stable physical overlay on top of TiO 2 substrates. Benefiting from the inert and atomic smooth graphene surface, the CsPbBr 3 film grown on top by the van der Waal epitaxy has higher crystallinity, improved (100) orientation, and an average domain size of up to 1.22 μm. Meanwhile, a strong downward band bending is observed at the graphene/perovskite interface, improving the electron extraction to the electron transport layers (ETL). As a result, perovskite film grown on graphene has lower photoluminescence (PL) intensity, shorter carrier lifetime, and fewer defects. Finally, a photovoltaic device based on epitaxy CsPbBr 3 film is fabricated, exhibiting power conversion efficiency (PCE) of up to 10.64% and stability over 2000 h in the air.
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