JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yijie Wang,Hougang Fan,Xiaoyan Liu,Jian Cao,Huilian Liu,Xin Li,Lili Yang,Maobin Wei
Efficient electron transfer process and excellent CO 2 adsorption capacity are of great significance for improving CO 2 photoreduction efficiency. 3 D– 0 D ZnO/CsPbBr 3 S-scheme heterojunction hollow spheres were successfully prepared via a simple self-assembled process for efficient CO 2 photoreduction. Photocatalytic CO 2 reduction experiments showed that the ZnO/CsPbBr 3 had the excellent CO 2 photocatalytic conversion activity to CO, which was about 2.61 times higher than that of ZnO hollow micro-spheres and 1.9 times higher than that of pure CsPbBr 3 quantum dots (QDs). Photoelectrochemical characterization confirmed that the ZnO/CsPbBr 3 composite had good photoelectric conversion ability and carrier transfer ability, which was beneficial to the photocatalytic reaction. The suitable band gap structure and DFT calculation results showed that the formation of built-in electric field at the ZnO/CsPbBr 3 interface can greatly improve the S-scheme electron transfer ability, which can foster the CO 2 photoreduction. Besides, the introduction of 3D structure can improve the dispersion of CsPbBr 3 QDs and effectively enhance the CO 2 capture ability of the catalyst, which greatly promoted the CO 2 photoreduction reaction. The current work can present a novel S-scheme photocatalyst , which is looked forward to providing a certain perception into the advance of novel highly efficient CsPbBr 3 QDs-based photocatalysts for CO 2 resource utilization.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Hui-Ling Hu,Hao Hao,Xue Ren,Zhe-Yong Chen,Meng Liu,Yi Liu,Feng-Lei Jiang
InP quantum dots (QDs) attract growing interest in recent years, owing to their environmental advantages upon applications in display and lighting. However, compared to Cd-based QDs and Pb-based perovskites, the synthesis of InP QDs with high optical quality is relatively more difficult. Here, we established a mid-synthetic modification approach to improve the optical properties of InP-based QDs. Tris(dimethylamino)phosphine ((DMA)3P) and indium iodide were used to prepare InP QDs with a green emission (∼527 nm). By introducing zinc halides (ZnX2) during the mid-synthetic process, the photoluminescence quantum yield (PLQY) of the resulting InP/ZnSeS/ZnS core/shell/shell QDs was increased to >70%, and the full-width-at-half-maximum (FWHM) could be narrowed to ∼40 nm. Transmission electron microscopy clearly showed the improvement of the QDs particle size distribution after introducing ZnX2. It was speculated that ZnX2 was bound to the surface of QDs as a Z-type ligand, which not only passivated surface defects and suppressed the emission of defect states but also prevented Ostwald ripening. The InP cores were also activated by ZnX2, which made the growth of the ZnSeS shell more favorable. The photoluminescence properties started to be improved significantly only when the amount of ZnX2 exceeded 0.5 mmol. As the amount increased, more ZnX2 was distributed around the QDs to form a ligand layer, which prevented the shell precursor from crossing the ligand layer to the surface of the InP core, thus reducing the size of the InP/ZnSeS/ZnS QDs. This work revealed a new role of ZnX2 and found a method for InP QDs with high brightness and low FWHM by the mid-synthetic modification, which would inspire the synthesis of even better InP QDs.
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Nanomaterials
·
2023
·Vol. 13
·期 2
·355
·
IF 5.3
Longshi Rao,Bin Sun,Yang Liu,Guisheng Zhong,Mingfu Wen,Jiayang Zhang,Ting Fu,Shuangxi Wang,Fengtao Wang,Xiaodong Niu
Inorganic lead halide perovskite is one of the most excellent fluorescent materials, and it plays an essential role in high-definition display and visible light communication (VLC). Its photochromic properties and stability determine the final performance of light-emitting devices. However, efficiently synthesizing perovskite with high quality and stability remains a significant challenge. Here, we develop a facile and environmentally friendly method for preparing high-stability and strong-emission CsPbBr3/Cs4PbBr6composites using ultrasonication and liquid paraffin. Tuning the contents of liquid paraffin, bright-emission CsPbBr3/Cs4PbBr6composite powders with a maximum PLQY of 74% were achieved. Thanks to the protection of the Cs4PbBr6matrix and liquid paraffin, the photostability, thermostability, and polar solvent stability of CsPbBr3/Cs4PbBr6-LP are significantly improved compared to CsPbBr3quantum dots and CsPbBr3/Cs4PbBr6composites that were prepared without liquid paraffin. Moreover, the fabricated CsPbBr3/Cs4PbBr6-LP-based WLEDs show excellent luminescent performance with a power efficiency of 129.5 lm/W and a wide color gamut, with 121% of the NTSC and 94% of the Rec. 2020, demonstrating a promising candidate for displays. In addition, the CsPbBr3/Cs4PbBr6-LP-based WLEDs were also demonstrated in a VLC system. The results suggested the great potential of these high-performance WLEDs as an excitation light source to achieve VLC.Keywords:ultrasonication;liquid paraffin;CsPbBr3/Cs4PbBr6;white-light-emitting diodes;visible light communication
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高影响因子
Materials
·
2023
·Vol. 16
·期 2
·840
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IF 3.4
Wenwen Wang,Xinyi Bai,Xiaochu Yuan,Yumin Liu,Lin Yang,Fangfang Chang
The compositions and surface facets of platinum (Pt)-based electrocatalysts are of great significance for the development of direct alcohol fuel cells (DAFCs). We reported an approach for preparing ultrathin PtnCo100−nnanowire (NW) catalysts with high activity. The PtnCo100−nNW alloy catalysts synthesized by single-phase surfactant-free synthesis have adjustable compositions and (111) plane and strain lattices. X-ray diffraction (XRD) results indicate that the alloy composition can adjust the lattice shrinkage or expansion of PtnCo100−nNWs. X-ray photoelectron spectroscopy (XPS) results show that the electron structure of Pt is changed by the alloying effect caused by electron modulation in the d band, and the chemical adsorption strength of Pt is decreased, thus the catalytic activity of Pt is increased. The experimental results show that the activity of PtnCo100−nfor the oxidation of methanol and ethanol is related to the exposed crystal surface, strain lattice and composition of catalysts. The PtnCo100−nNWs exhibit stronger electrocatalytic performance for both methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR). The dominant (111) plane Pt53Co47exhibits the highest electrocatalytic activity in MOR, which is supported by the results of XPS. This discovery provides a new pathway to design high activity, stability nanocatalysts to enhance direct alcohol fuel cells.Keywords:direct alcohol fuel cells;nanowire;nanocatalysts;alloy effect;lattice strain
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xijian Duan,Jingrui Ma,Wenda Zhang,Pai Liu,Haochen Liu,Junjie Hao,Kai Wang,Lars Samuelson,Xiao Wei Sun
InP quantum dots (QDs) are the most competitive in terms of environmentally friendly QDs. However, the synthesis of InP QDs requires breakthroughs in low-cost and safe phosphorus precursors such as tri(dimethylamino)phosphine [(DMA)3P]. It is found that even if the oxygen is completely avoided, there are still oxidation state defects at the core/shell interface of InP QDs. Herein, the record-breaking (DMA)3P-based red InP QDs were synthesized with the assist of HF processing to eliminate the InPOx defect and improve the fluorescence efficiency. The maximum photoluminescence quantum yield was 97.7%, which is the highest of the red InP QDs synthesized by the aminophosphine. The external quantum efficiency and brightness of the QD light-emitting diode device are also improved accordingly from 0.6% and 1276 cd·m–2 to 3.5% and 2355 cd·m–2, respectively.
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JOURNAL OF LUMINESCENCE
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2022
·
IF 4.171
Lijin Wang,Zhongyuan Guan,Zhenyang Liu,Ouyang Lin,Wenrong Cui,Zhe Yin,Aiwei Tang
The interplay between ZnS shelling reaction and cation exchange affected the genuine nanostructure of the multinary Cu–In–S-based nanocrystals (NCs), which arose from the dosage and injection speed of Zn precursors as well as the surface of the seed NCs. The effects of Zn precursors on the growth of Cu–In–Zn–S NCs have been previously reported. However, effective control of cation exchange based on the surface of seed NCs is still lacking. Herein, a seed-mediated growth method was developed to eliminate the instability of free ligands and ions on the seed NCs. The clean surface of seed NCs was critical for balancing the internal cation exchange and epitaxial shelling reaction of NCs. Importantly, the photoluminescence quantum yield of the Cu–In–Zn–S NCs has been improved without peak shift through this method. In this dynamic balanced process, the as-obtained Cu–In–Zn–S NCs were confirmed to be gradient alloyed structures rather than core-shell structures. Furthermore, this method can be used to synthesize green- and red-emission Cu-In-Zn-S NCs as well. This seed-mediated strategy through simple redispersion may pave a way toward the controllable synthesis of NCs with gradient alloyed structures.
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Journal of the Taiwan Institute of Chemical Engineers
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2022
·
IF 5.477
Shangyan Zhou,Wei Liao,Zhengcheng Wang,Qian Zhou,Jin Long,Meida Chen,Qingmei Wang
Background Developing an economical and durable high-activity Pt-based electrocatalyst to alleviate the slow kinetics of the oxygen reduction reaction (ORR) is crucial for fuel cells. The shape-controllable Pt 3 Ni alloy catalyst with high electrocatalytic properties is regarded as one of the most efficacious electrocatalysts capable of accelerating ORR kinetics. Methods Here, sub-3 nm Pt-rich Pt 3 Ni dodecahedrons (DCs) has been developed via surfactant-driven shape evolution route as effective electrocatalysts for ORR. Significant findings The Pt 3 Ni DCs exhibit 4.3-fold improvement for mass activity and 4.7-fold improvement for specific activity respect to pristine Pt/C catalyst. Moreover, the remaining specific activity on Pt 3 Ni DCs is 6.7 times larger relative to pristine Pt/C catalyst after 20,000 scanning cycles. Such electrocatalytic performance enhancement is attributed to the ensemble effect including the dodecahedrons shape and synergistic effect between Pt and Ni atoms. We believe that our synthetic approach would provide new avenues toward the formation of polyhedron structures.
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ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Jieyu Bai,Hailong Hu,Yongshen Yu,Yangbin Zhu,Zhongwei Xu,Wenchen Zheng,Haobing Zhao,Kaiyu Yang,Lihua Lin,Tailiang Guo,Fushan Li
InP quantum dots (QDs) are considered to be one of the most promising materials for application in light-emitting devices due to the advantages of heavy-metal-free characteristic and widely tunable spectrum covering most of the visible and near-infrared regions. However, the performance of InP quantum dot light-emitting diodes (QLEDs) lags far behind their Cd-containing counterparts, especially as the InP pixelated device is still in its infancy. In this study, multi-component functional QD inks with excellent stability and printability was developed for inkjet printing InP array QLEDs. High-quality QD films can be obtained, both on flat and bank-containing substrates, by precisely controlling the competition between capillary and Marangoni flows in the printed droplets, enabling high device performance. In addition, a periodic ZnO microlens arrays was prepared by nanoimprinting technology to enhance the light extraction efficiency of inkjet-printed InP QLEDs, leading to 127.6% improvement in external quantum efficiency (EQE) compared to the control device. The maximum luminance, EQE and current efficiency of the obtained device are 17,759 cd/m 2 , 8.1% and 11.1 cd/A, respectively. These results may facilitate the applications of high performance environment-friendly QLEDs by inkjet printing technology.
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Laser & Photonics Reviews
·
2023
·Vol. 17
·期 5
·2200749
·
IF 11
Jinxing Zhao,Lijin Wang,Peiwen Lv,Fenghe Wang,Xu Li,Song Chen,Lei Qian,Aiwei Tang
Although cadmium (Cd)-based nanocrystals have enabled high-performance quantum-dot light-emitting diodes (QLEDs), their mass production is likely to be affected by environmental protection policies. Among all the potential Cd-free candidates, Cu-In-Zn-S (CIZS) nanocrystals (NCs) have attracted particular interests. Still, the performance of the corresponding LED is currently limited by imbalanced charge injection and luminescence quenching, which are both related to the ZnO-based electron transporting layer (ETL). This work demonstrates that ZnO nanoparticles (NPs) doped with Sn, Mg (Zn 1− x − y Sn x Mg y O), and passivated with Cl are promising to resolve the above issues. All-solution-processed QLEDs based on Cd-free CIZS NCs are fabricated by using Zn 0.9 Sn 0.1 O NPs as the ETL, and the peak external quantum efficiency (EQE max ) was nearly twice that of ZnO (EQE max = 1.74%). The main reason is that the incorporation of Sn can reduce the conductivity of ZnO by an order of magnitude. Combining the advantages of Zn 0.9 Sn 0.1 O, Zn 0.8 Sn 0.1 Mg 0.1 O@Cl NPs are designed by the co-doping of Mg and Cl passivation. The EQE max and current efficiency based on Zn 0.8 Sn 0.1 Mg 0.1 O and Zn 0.8 Sn 0.1 Mg 0.1 O@Cl as ETLs are further increased to 4.84%, 14.00 cd A −1 and 5.53%, 15.99 cd A −1 , respectively. The positive effects of Mg ions can remarkably optimize energy level structure to balance charge injection, while Cl can further passivate defects. The findings offer a new guideline for developing Cd-free light-emitting diodes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Cong Xie,Wenbin Shi,Junpeng Wang,Ping Yang
Two dimensional cesium lead bromide (CsPbBr 3 ) nanoplatelets (NPLs) have gained numerous attention due to its tunable thickness, large exciton binding energy and excellent optical properties which can be applied in various photoelectric device. However, synthesizing blue emitting NPLs with long-term stability and high photoluminescence quantum yields (PLQYs) was still difficult. Here, we demonstrate a strategy based on surface ligand engineering, using didodecyldimethylammonium bromide and sodium dodecylbenzene sulfonate as surface ligands to impart higher PLQYs to perovskite materials while improving the stability of CsPbBr 3 NPLs. These ligands strongly interact with CsPbBr 3 NPLs, compared with untreated materials, effectively eliminating defects on the surface of NPLs and significantly improving the structural stability of perovskite materials. High-quality CsPbBr 3 NPLs with high color purity (narrow peaks located at ∼470 nm) and PLQYs up to 90 % were prepared by this method. In addition, the stability of treated NPLs under some harsh environments (including long-term storage, high temperature and 365 nm UV light irradiation) has been significantly improved. White light-emitting diodes were finally fabricated using these highly bright and stable CsPbBr 3 NPLs.
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Jing Li,Cailing Zhu,Wenjing Peng,Xiaoqing Cao,Hui Gao,Mengyuan Jiang,Zengqiang Wu,Chunmei Yu
Hydrogen sulfide (H2S), as the third gas transporter in biological systems, plays a key role in the regulation of biological cells. Real-time detection of local H2S concentration in vivo is an important and challenging task. Herein, we explored a novel and facile strategy to develop a flexible and transparent H2S sensor based on gold nanowire (AuNW) and carbon nanotube (CNT) films embedded in poly(dimethylsiloxane) (PDMS) (AuNWs/CNTs/PDMS). Taking the advantage of the sandwich-like nanostructured network of AuNWs/CNTs, the prepared electrochemical sensing platform exhibited desirable electrocatalytic activity toward H2S oxidation with a wide linear range (5 nM to 24.9 μM) and a low dete ction limit (3 nM). Furthermore, thanks to the good biocompatibility and flexibility of the sensor, HeLa cells can be cultured directly on the electrode, allowing real-time monitoring of H2S released from cells under a stretched state. This work provides a versatile strategy for the construction of stretchable electrochemical sensors, which has potential applications in the study of H2S-related signal mechanotransduction and pathological processes.
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Micromachines
·
2022
·Vol. 14
·期 1
·11
·
IF 3.523
Weigao Wang,Yiyang Li,Yu Duan,Mingxia Qiu,Hua An,Zhengchun Peng
Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is widely used in optoelectronic devices due to its excellent hole current conductivity and suitable work function. However, imbalanced carrier injection in the PEDOT:PSS layer impedes obtaining high-performance perovskite light-emitting diodes (PeLEDs). In this work, a novel poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,40-(N-(p-butylphenyl))diphenylamine)] (TFB) is applied as the hole transport layers (HTLs) to facilitate the hole injection with cascade-like energy alignment between PEDOT:PSS and methylammonium lead tribromide (MAPbBr3) film. Our results indicate that the introduced TFB layer did not affect the surface morphology or lead to any additional surface defects of the perovskite film. Consequently, the optimal PeLEDs with TFB HTLs show a maximum current efficiency and external quantum efficiency (EQE) of 21.26 cd A−1and 6.68%, respectively. Such EQE is 2.5 times higher than that of the control devices without TFB layers. This work provides a facile and robust route to optimize the device structure and improve the performance of PeLEDs.Keywords:lead halide perovskites;perovskite light-emitting diodes;hole transport layers;interface modification
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