NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 2
·1082-1091
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IF 3.591
Yunqi Wang,Zhixiang Liu,Xu Tang,Pengwei Huo,Zhi Zhu,Boting Yang,Zhi Liu
In-depth research of the active sites and charge transport behavior is an important topic for investigating photocatalytic reduction of CO2. Herein, a novel photocatalyst composed of flake-like porous graphitic carbon nitride (P-CN) and CsPbBr3 is fabricated via a high temperature calcination and freeze drying method. The experimental results show that P-CN/CsPbBr3 has a superior CO2 reduction efficiency, and that the yield of CO reaches 30.39 μmol g−1, which is about 7.2 and 1.2 times higher than those of the primary B-CN (4.2 μmol g−1) and CsPbBr3 (24.4 μmol g−1), respectively. The improvement in photocatalytic performance is mainly ascribed to the heterostructure, which can promote the separation of photogenerated carriers, and the porous structure of P-CN, which can improve the absorption capacity of CO2. This study provides a significant method for the construction of efficient g-C3N4 based photocatalysts to reduce CO2.
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Wei Wang,Pengyin Deng,Xiqing Liu,Yuqin Ma,Yongsheng Yan
The abuse of tetracycline (TC) antibiotics would seriously affect human health and hence the detection had become essential. Here, we had constructed a hydrophobicity of fluorescence sensor based on the excellent photoluminescence emission of CsPbBr 3 QDs and the hydrophobic ability of Boron Nitride (BN). This design effectively solved the instability of CsPbBr 3 QDs and realized the sensitive detection of TC. Under optimum conditions, the linear range of TC was 0–0.44 mg L −1 with the 6.5 μg L −1 . Furthermore, the sensor was successfully used for the recognition of TC in honey and milk samples. This work also provided an ideal for designing CsPbBr 3 QDs-based on fluorescence sensor.
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Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 6
·1983-1991
·
IF 7.059
Lin Yang,Bowen Fu,Xu Li,Hao Chen,Lili Li
All inorganic perovskite quantum dots (QDs) have received great attention owing to their excellent performance in optoelectronic applications. However, they often suffer from defect-related photoluminescence (PL) quenching and phase transformation due to the loss of long-chain organic ligands, such as oleic acid (OA) and oleylamine (OAm). Here, we fabricated CsPbBr3 QDs by a one-step microwave method, in the presence of α-phase poly(vinylidene fluoride) (PVDF) acing as the surface capping ligands. The PVDF-CsPbBr3 QDs display a photoluminescence quantum yield (PLQY) of up to 98% (much higher than pristine QDs with OA/OAm as capping ligands), excellent stability in the desired cubic phase structure, and enhanced photoluminescence stability under ambient conditions. Using the as-prepared QDs as a light emitter, the efficient green perovskite quantum-dot light-emitting diode (QLED) with an external quantum efficiency (EQE) of 1.71% was prepared, exhibiting a peak luminance of 5711 cd m−2 at 516 nm. Theoretical calculations indicate that there exists a much stronger interaction between the CsPbBr3(001) surface and PVDF as compared to OA/OAm ligands, further explicating sufficient surface passivation with the introduced PVDF ligand.
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Photonics Research
·
2020
·Vol. 8
·期 8
·1301-1308
·
IF 6.099
Yifan Li,Yating Zhang,Zhiliang Chen,Qingyan Li,Tengteng Li,Mengyao Li,Hongliang Zhao,Quan Sheng,Wei Shi,Jianquan Yao,Jianquan Yao
Self-powered and flexible ultrabroadband photodetectors (PDs) are desirable in a wide range of applications. The current PDs based on the photothermoelectric (PTE) effect have realized broadband photodetection. However, most of them express low photoresponse and lack of flexibility. In this work, high-performance, self-powered, and flexible PTE PDs based on laser-scribed reduced graphene oxide (LSG)/CsPbBr3 are developed. The comparison experiment with LSG PD and fundamental electric properties show that the LSG/CsPbBr3 device exhibits enhanced ultrabroadband photodetection performance covering ultraviolet to terahertz range with high photoresponsivity of 100 mA/W for 405 nm and 10 mA/W for 118 μm at zero bias voltage, respectively. A response time of 18 ms and flexible experiment are also acquired at room temperature. Moreover, the PTE effect is fully discussed in the LSG/CsPbBr3 device. This work demonstrates that LSG/CsPbBr3 is a promising candidate for the construction of high-performance, flexible, and self-powered ultrabroadband PDs at room temperature.
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Journal of Nanomaterials
·
2020
·
IF 1.98
Shibing Zou,Feng Li
Highly efficient all-inorganic perovskite solar cells require a fast charge transfer from CsPbBr3 to TiO2 to reduce the recombination from trap states. Herein, we insert a CdS/CdSe/CdS quantum dot (QD) layer between the TiO2 and CsPbBr3 layers to fabricate all-inorganic perovskite solar cells. By tuning the thicknesses of the CdSe layer of CdS/CdSe/CdS QDs, the conduction band (CB) levels can be adjusted to -3.72~-3.87 eV. After inserting the QD intermediate layer, the energy offset between the CB of TiO2 and CsPbBr3 is reduced, thus leading to a charge transfer rate boost from to . The power conversion efficiency (PCE) of the solar cell with QD intermediate layer achieves 8.64%, which is 20% higher than its counterpart without QDs.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Jiahao Yan,Shaochuan Hou,Xiaoyan Li,Jingjing Dong,Li Zou,Meili Yang,Jie Xing,Hao Liu,Huiying Hao
CsPbBr 3 perovskite solar cell has become a hot research object due to its excellent stability. It has been proved that anti-solvent washing is a good way to improve the crystal quality of organic-inorganic hybrid perovskite materials using a one-step spin-coating method. However, it is rarely reported in the preparation of all-inorganic perovskite materials. Here, an anti-solvent rinsing strategy was introduced for the synthesis of CsPbBr 3 films via the multi-step spin-coating process. We found that the addition of anti-solvent with high boiling points could significantly improve the surface morphology and crystal quality of CsPbBr 3 films by optimizing the nucleation and crystallization of PbBr 2 films. By virtue of the anti-solvent rinsing strategy, the highest efficiency of 9.6% and long-term stability over 800 h in ambient air without encapsulation were achieved. Our conclusions provide a certain reference value for the preparation of highly efficient and stable CsPbBr 3 perovskite solar cells.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Zhe Li,Qi Kang,Lu Chen,Bin Zhang,Guizheng Zou,Dazhong Shen
The poor aqueous stability of perovskite nanocrystals (NCs) limits their electrochemical applications. Herein, we reported a waterproof and conductive silica gel shell encapsulating CsPbBr 3 NCs, enhancing its aqueous stability and radiative-charge-transfer efficiency. Upon introducing small volume of CsBr aqueous solution in hexane containing tetramethoxysilane (TMOS) and Cs 4 PbBr 6 NCs, the conversion reaction of Cs 4 PbBr 6 → CsPbBr 3 +3CsBr was triggered to form Cs 4 PbBr 6 @CsPbBr 3 @silica gel (CsBr) hybrid. The silica gel shell can block the contact between CsPbBr 3 NCs and bulk aqueous phase. The CsBr enclosed in the silica gel can reduce the conversion rate and increase dramatically the electrical conductivity of the silica gel. The electrochemiluminescence (ECL) of CsPbBr 3 NCs in aqueous phase was enhanced greatly. The strong ECL of CsPbBr 3 NCs in the hybrid was still observed after stored in CsBr solution for 30 day. The as-obtained perovskite hybrid displays improved electrochemical charge-injecting performance and radiative-charge-transfer in ECL. Annihilation ECL demonstrates that all the electrons injected onto the perovskite hybrid can recombine with the holes injected onto it for light-emitting. Both annihilation and co-reactant ECL, as well as photoluminescence reveal that encapsulating CsPbBr 3 NCs into a conductive and waterproof silica gel shell is favorable to enhance aqueous performance of perovskite NCs with negligible effects on their excited states. The ECL of the core-shell perovskite hybrid was applied to detect dopamine in the concentration range of 0.01–10 μM, with the limit of detection of 3 nM.
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Solar RRL
·
2019
·Vol. 4
·期 1
·1900365
·
IF 0
Zi-Cheng Kong,Hong-Hong Zhang,Jin-Feng Liao,Yu-Jie Dong,Yong Jiang,Hong-Yan Chen,Dai-Bin Kuang
The excellent photoelectrical properties have rendered lead halide perovskites potential candidates for photocatalytic CO 2 reduction, but they still suffer from the low charge separation efficiency and slow catalytic reaction dynamics. To tackle these drawbacks, herein, a novel CsPbBr 3 -Re(CO) 3 Br(dcbpy) (dcbpy=4,4’-dicarboxy-2,2’-bipyridine) composite photocatalyst is elaborately designed and fabricated by anchoring the complex molecules onto the surface of CsPbBr 3 nanocrystal to work as co-catalyst. Owing to the robust interfacial interaction, effective electron extraction from CsPbBr 3 to complex molecules can be established, which enables the mutual synergetic action to get boosted visible-light-driven catalytic activity and product selectivity. As an encouraging result, a high electron consumption rate of 73.34 μmol g −1 h −1 is yielded for the optimized CsPbBr 3 -Re(600) sample, which is about 23-fold of that of pristine CsPbBr 3 . In addition, a praiseworthy CO selectivity of up to 95% is obtained. The composite catalyst also exhibits good catalytic stability, and a CO yield of 509.14 μmol g −1 is achieved after 15 h of continuous illumination. This result may provide a new strategy to design efficient lead halide perovskite-based heterogeneous photocatalysts.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Guodong Su,Benlin He,Zekun Gong,Yang Ding,Jialong Duan,Yuanyuan Zhao,Haiyan Chen,Qunwei Tang
Carbon-based all-inorganic CsPbBr 3 perovskite solar cells (PSCs) have attracted growing interests due to low cost and excellent tolerances toward moisture, temperature, oxygen and ultraviolet light. However, carrier recombination of CsPbBr 3 film and large energy level differences at CsPbBr 3 /carbon interface are still the most crucial problem for further enhancement of power conversion efficiency. In the current study, an intermediate energy level at CsPbBr 3 /carbon interface and CsPbBr 3 film passivation are employed by coating hexane solution of CsPbBr x I 3-x nanocrystals (NCs) on the perovskite layer. Through systematic study on interfacial engineering , it is found that CsPbBr x I 3-x NCs with tunable energy level can remarkably reduce energy loss and hexane under passivation treatment can enlarge perovskite grain size as well as reduce trap state density. A champion power conversion efficiency of 9.45% is achieved for CsPbI 3 NCs tailored all-inorganic CsPbBr 3 PSC in comparison with 5.26% for NCs-free device, with the unencapsulated carbon-based CsPbBr 3 PSC exhibiting remarkable long-term stability over 900 h in 80% relative humidity air atmosphere at 25 °C. This work provides an effective approach to promote charge extraction and reduce defect states density as well as enhance the performance of PSCs.
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ChemNanoMat
·
2018
·Vol. 5
·期 3
·318-322
·
IF 3.173
Li Zhang,Qiong Zhang,Xiangyu Xing,Yuanzhi Jiang,Tingwei He,Yanmin Huang,Zhiwei Ma,Jien Yang,Mingjian Yuan
Graphical Efficient green light-emitting diodes were fabricated by using CsPbBr 3 nanocrystals with excellent carrier transportation properties, owing to the introduction of conjugated alkyl-amine through two-step surface ligand engineering. LEDs exhibit a high luminance of 26,475 cd m −2 , a high CE of 23.53 cd A −1 by incorporation conjugation molecular ligand into the all-inorganic perovskite nanocrystals. Long alkyl-chain capped ligands are prerequisites for preserving high photoluminescence quantum yield (PLQY) in perovskite nanocrystals (NCs). Unfortunately, the insulating feature of surface ligands potentially hinders carrier transport in light-emitting diode (LED) devices, which will degenerate the LED performance. To overcome this shortcoming, we introduce a conjugated molecule, 3-phenyl-2-propen-1-amine (PPA), into CsPbBr 3 NCs through a two-step surface ligand engineering process. Owing to excellent electrical conductivity of PPA, PPA-capped CsPbBr 3 NCs LEDs exhibit a maximum current efficiency of 23.53 cd A −1 , and a maximum luminance of 26,475 cd m −2 at the wavelength of 517 nm. This work offers a new strategy to improve the quality of CsPbBr 3 NCs and LEDs by introducing conjugation molecular ligands into the all-inorganic perovskite nanocrystals.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 22
·13762-13769
·
IF 10.733
Yong Jiang,Jin-Feng Liao,Yang-Fan Xu,Hong-Yan Chen,Xu-Dong Wang,Dai-Bin Kuang
Solar-driven CO2 conversion for chemical fuel production has been regarded as an effective strategy to alleviate environmental and energy issues. In this study, we constructed a novel composite catalyst film, in which CsPbBr3 nanocrystals (NCs) were loaded on a hierarchical branched ZnO nanowire (BZNW)/macroporous graphene scaffold (CsPbBr3 NC/BZNW/MRGO). This well-designed multi-dimensional architecture rationally integrated the excellent visible-light absorption capability of CsPbBr3 NCs, and fast charge transport and improved CO2 capture ability afforded by ZnO nanowire-branched macroporous graphene. Due to this favorable synergistic effect, a boosted photocatalytic performance was achieved with a photoelectron consumption rate of 52.02 μmol gcat−1 h−1 under visible light irradiation, which is 4.98 and 1.65 times higher than that of CsPbBr3 NC (10.44 μmol gcat−1 h−1) and CsPbBr3 NC/MRGO (31.52 μmol gcat−1 h−1), respectively. Furthermore, desirable CH4 selectivity of up to 96.7% was achieved.
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Nanoscale
·
2017
·Vol. 9
·期 44
·17248-17253
·
IF 7.367
Yibing Xu,Qiang Zhang,Longfei Lv,Wenqian Han,Guanhong Wu,Dong Yang,Angang Dong
Discretely sized semiconductor clusters have attracted considerable attention due to their intriguing optical properties and self-assembly behaviors. While lead halide perovskite nanostructures have been recently intensively explored, few studies have addressed perovskite clusters and their self-assembled superstructures. Here, we report the room-temperature synthesis of sub-2 nm CsPbBr3 clusters and present strong evidence that these ultrasmall perovskite species, obtained under a wide range of reaction conditions, possess a specific size, with optical properties and self-assembly characteristics resembling those of well-known II–VI semiconductor magic-sized clusters. Unlike conventional CsPbBr3 nanocrystals, the as-synthesized CsPbBr3 nanoclusters spontaneously self-assemble into a hexagonally packed columnar mesophase in solution, which can be further converted to single-crystalline CsPbBr3 quantum nanoribbons with bright deep-blue emission at room temperature. Such a conversion of CsPbBr3 nanoclusters to nanoribbons is found to be driven by a ligand-destabilization-induced crystallization and mesophase transition process. Our study will facilitate the investigation of perovskite nanoclusters and offer new possibilities in the low-temperature synthesis of anisotropic perovskite nanostructures.
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