JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Chenghao Wang,LiShuai Zong,Nan Li,Yunxing Pan,Qian Liu,Fengfeng Zhang,Liyuan Qiao,Jinyan Wang,Xigao Jian
Emergency situation of electromagnetic microwave pollution generated by daily electronic devices urgently requires light-weight and efficient microwave absorption materials with thin thickness and low filling ratio. Herein, the heteroatoms-doped Fe 3 C@C nanofibers are fabricated from a mixture solution of Iron (III) 2, 4-pentanedionate (Fe(acac) 3 ) and nitrogen-containing polymer poly (phthalazinone ether nitrile ketone) (PPENK) by electrospinning and the following thermal treatment. The morphologies and compositions of nanofibers can be controlled by annealing temperature. The 1-Dimensional (1D) heteroatoms-doped Fe 3 C@C nanofibers display outstanding microwave absorption performance. When the filling ratio is 30 wt% in paraffin for nanofibers heat-treated in 700 ℃, the optimal reflection loss value is − 35.5 dB at 8.3 GHz with a thickness of 2.8 mm. Additionally, the maximal efficient absorption bandwidth reaches as wide as 4.9 GHz ranging from 13.1 to 18.0 GHz with a rather thin thickness of 1.6 mm. The Fe 3 C@C nanofibers have adjustable electromagnetic parameters and thus, balance impedance matching and microwave attenuation performance at the same time. This work investigates the relationship between microwave absorption performance and the chemical states of nitrogen atoms, revealing a facile strategy to prepare a multi-interface microwave absorber and presenting a candidate application for microwave absorption materials with low matching thickness.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
·
IF 3.764
Ju Liu,Dandan Hao,Huiwen Sun,Yu Li,Jianlin Han,Bo Fu,Jiancheng Zhou
In this Article, a hybrid foam was fabricated through the integration of amine-functionalized Fe-MOF (MIL-101-NH2) into cellulosic matrix. The existence of enormous group linkages and ionic bonding interactions among the composite foam network leads to a uniform dispersion of MIL-101-NH2 and high affinity between the MOF and cellulose skeleton. As-prepared hybrid foams were utilized as photocatalysts to reduce toxic hexavalent chromium ions (Cr(VI)) under visible light. Optimal performance was observed over CM-1 (with a MIL-101-NH2 and nanocellulose mass ratio of 1:1). When compared to pure MOF nanoparticle counterparts, the CM-1 foam presented preferable and more efficient Cr(VI) removal performance. The reasons could be attributed to the hierarchal pore structure and uniform MOF loading. Moreover, the flexible foams could be easily separated from the solution and preserved more than 80% removal efficiency of Cr(VI) after 10 runs. This work would shed light on how to construct high-efficiency photocatalysts for environmental governance from sustainable materials.
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ACS Sustainable Chemistry & Engineering
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2021
·
IF 8.198
Ya Chen,Xiaojuan Liang,Jianping Liu,Suqin Chen,Weidong Xiang
All-inorganic CsPbX3 perovskite nanocrystals (PeNCs) are being investigated intensively as a promising optoelectronic material. However, the issues of its intrinsic instability and toxicity restrict their commercial applications. Herein, we proposed a facile method to improve the stability of CsPbX3PeNCs by encapsulating in a superhydrophobic polymer poly(styrene–ethylene–butylene–styrene) (SEBS) matrix. The blue–green–red emission CsPbX3@SEBS (X = Cl/Br, Br, Br/I) composite films exhibit high stability against moisture and are thermally stable. It is worth noticing that the photoluminescent quantum yield (PLQY) of the CsPbBrI2@SEBS composite film can reach 60%. The SEBS polymer matrix not only protects the PeNCs from contact with the ambient surroundings but also inhibits the escape of lead ions. Notably, the CsPbX3@SEBS flexible films were used as color conversion materials to construct a light-emitting diode (LED) device, and the device exhibits a wide color gamut (113% of the National Television System Committee (NTSC)). This work demonstrates the potential of using CsPbX3@SEBS flexible films as highly efficient color conversion materials for white LED and backlight displays.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2021
·Vol. 38
·期 10
·2100120
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IF 3.31
Jinke Bai,Meilun Zhang,Ruiyao Jiang,Ziming Wu,Linfeng Wang,Xiao Jin,Qinghua Li,Yuxiao Wang,Xueru Zhang,Yinglin Song
Solid-phase color converter-based quantum dots (QDs) white light-emitting diodes (WLEDs) have become promising next-generation solid-state light sources. However, the development of these WLEDs’ production still suffers from constraints involving insufficient color-rendering index (CRI), low color stability, and short operation lifetimes. Here, thick-shell Cd 0.05 Zn 0.95 S/CdSe/Cd x Zn 1– x S spherical quantum wells are developed with good color tunability from green to red regions and high photoluminescence quantum yield (up to 88% for green wavelengths). QDs with five emission colors are used to fabricate a series of WLEDs, which possess a good correlated color temperature tunability from warm (3210 K) to cool (22 000K) white light, and a high CRI Ra (>90). Specifically, the neutral white light device with Commission Internationale de l´Eclairage (CIE, International Commission on illumination) of (0.36, 0.36) and the standard white light device with CIE of (0.33, 0.33) achieve a CRI Ra up to 95.8 and 95.11, respectively, they also exhibit long operating life and great color stability. These results indicate that the improvement of the performance and stability of the WLED based on thick-shell spherical quantum wells is remarkable progress in the commercialization of QD-based solid-state lighting.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Wentao Ye,Yu Jiang,Qi Liu,Doudou Xu,En Zhang,XinWei Cheng,Zhou Wan,Chen Liu
Photocatalytic technology has been attracting considerable attention due to its low cost and environmental friendly properties. In this work, a novel ZnO/Ag 2 MoO 4 /Ag (ZAA) nanocomposite was prepared by an ultrasonic-irradiation method as an efficient visible-light-driven photocatalyst. The structure and photocatalytic property of the photocatalyst were studied by XRD , SEM, FTIR, XPS , TEM , UV–vis DRS and PL Spectroscopy, respectively. The results indicated that the Ag 2 MoO 4 nanocomposites were successfully decorated on the ZnO sheets which grabbed Ag NPs. Benefiting from local surface plasmon resonance effect of metallic silver and the formation of heterojunctions between the counterparts of ZnO and Ag 2 MoO 4 , it effectively suppresses recombination of photogenerated charge carriers, which can enhance good photocatalytic properties and antibacterial activities. An optimal photocatalysis of ZAA with molar ratio of ZnO to Ag 2 MoO 4 at 40:1 performed the highest degradation rate for rhodamine B under visible light irradiation. In addition, over 99.999% of Gram-negative E. coli and 99.846% of Gram-positive S. aureus were reduced by ZAA-40 nanocomposites within 60 min in comparison to pure ZnO sheet. These results demonstrate that ZAA is a promising photocatalyst, making it a prospective strategy to overcome current challengers in the use of organic pollutant degradation and the photocatalytic antibacterial area.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Ahmed Mahmoud Idris,Xinyan Jiang,Jun Tan,Zhenzhi Cai,Xiaodan Lou,Jin Wang,Zhengquan Li
Dye-sensitized system holds great potential for the development of visible-light-responsive photocatalysts not only because it can enhance the light absorption and charge separation efficiency of the systems but also because it can tune the band structure of catalysts. Herein, two-dimensional (2D) Fe-MOF nanosheets (Fe-MNS) with a LUMO potential of 0.11 V ( vs. RHE) was prepared. Interestingly, it has been found that when the 2D Fe-MNS catalyst was functionalized with visible-light-responsive [Ru(bpy)] 3 2+ as a dye-sensitizer, the electrons from the [Ru(bpy)] 3 2+ can effectively inject into the 2D Fe-MNS, which resulted in a negative shift of the LUMO potential of the 2D Fe-MNS to −0.15 V ( vs. RHE). Consequently, the [Ru(bpy)] 3 2+ /Fe-MNS catalytic system exhibits a sound photocatalytic CO 2 -to-CO activity of 1120 μmol g -1 h −1 under visible-light-irradiation. The photocatalytic CO production was further ameliorated by regulating the electronic structure of the 2D Fe-MNS by doping Co ions , achieving a remarkable photocatalytic activity of 1637 μmol g -1 h −1 . This work further supports that the dye-sensitized system is an auspicious strategy worth exploring with different catalysts for the development of visible-light-responsive photocatalytic systems.
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高影响因子
JOURNAL OF MATERIALS RESEARCH
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2021
·Vol. 36
·期 16
·3366-3379
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IF 3.089
Wu Chenyan,Huang Feilong,Shen Qianhong,Yu LiXin,Zhang Changteng,Sheng Jiansong,Cheng Di,Yang Hui
Abstract The magnetic photocatalysts play an important role in practical application. Herein, a novel magnetic hierarchical Z-scheme NiFe 2 O 4 @Bi 2 Sn 2 O 7 heterojunction photocatalyst was fabricated by hydrothermal strategy. The structure, micromorphology and physical properties of the as-prepared products were analysed, and the photocatalytic performance was carried out via photocatalytic degradation of tetracycline hydrochloride under visible-light irradiation. The longest average carrier lifetime of the NiFe 2 O 4 @Bi 2 Sn 2 O 7 composite is about 2.9 times longer than that of pure Bi 2 Sn 2 O 7 (2.45 ns), thereby achieving the enhanced photocatalytic activity. After a four-cycle photocatalytic degradation reaction, the NiFe 2 O 4 @Bi 2 Sn 2 O 7 composite still exhibits excellent photocatalytic activity and structural stability due to its magnetic property, and this feature is conducive to its practical application. The results demonstrate that NiFe 2 O 4 nanoparticles are uniformly loaded on flower-like hierarchical Bi 2 Sn 2 O 7 , and thus not only forming nanosized Z-scheme NiFe 2 O 4 @Bi 2 Sn 2 O 7 heterostructure, but also making the composite material magnetic. This work provided new perspectives about construction of heterojunction photocatalysts. Graphic Abstract
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ORGANIC ELECTRONICS
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2021
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IF 3.721
Yanyan Wu,Fang Yuan,Feifei Fu,Chenxing Liu,Bo Jiao,Fanghui Zhang,Zhaoxin Wu
Since the emergence of organic-inorganic hybrid perovskites , the development of perovskite light-emitting diodes (PeLEDs) with green/red emission have made great progress, and the corresponding external quantum efficiency (EQE) has exceeded 20%. However, the research progress of blue-emitting PeLED still has certain challenges. In this article, a multi-cation per-bromine perovskite film is prepared by introducing polymer molecules poly(9-vinylcarbazole) (PVK) in an anti-solvent (chloroform). When the concentration of PVK is optimized to 0.1 mg/mL, a smooth, dense, high-quality film with photoluminescence quantum efficiency (PLQY) up to 20.70% is obtained. The introduction of PVK can assist the formation of perovskite films for interface modification via surface defect passivation . The optimized blue PeLED has a maximum brightness of 3136 cd/m 2 and a maximum EQE of 3.49% at 488 nm. More importantly, the optimized blue PeLED has excellent color stability under high applied voltage up to 12 V or continuous operation.
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Light-Science & Applications
·
2021
·Vol. 10
·期 1
·1-9
·
IF 17.782
Chen Baiyi,Zhang Rongrong,Hou Yaqi,Zhang Jian,Chen Shiyan,Han Yuhang,Chen Xinyu,Hou Xu
Safe and precise control of gas flow is one of the key factors to many physical and chemical processes, such as degassing, natural gas transportation, and gas sensor. In practical application, it is essential for the gas-involved physicochemical process to keep everything under control and safe, which significantly relies on the controllability, safety, and stability of their valves. Here we show a light-responsive and corrosion-resistant gas valve with non-thermal effective liquid-gating positional flow control under a constant pressure by incorporating dynamic gating liquid with light responsiveness of solid porous substrate. Our experimental and theoretical analysis reveal that the photoisomerization of azobenzene-based molecular photoswitches on the porous substrate enabled the gas valve to possess a light-responsive and reversible variation of substantial critical pressure of non-thermal effective gas flow switch. Moreover, the chemically inert gating liquid prevented the solid substrate from corrosion and, by combining with the high spatiotemporal resolution of light, the gas valve realizes a precisely positional open and close under a steady-state pressure. The application demonstrations in our results show the potentials of the new gas valve for bringing opportunities to many applications, such as gas-involved reaction control in microfluidics, soft actuators, and beyond.
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高影响因子
Coatings
·
2021
·Vol. 11
·期 7
·816
·
IF 2.881
Ziang Xu,Guiying Xu,Beibei Han,Kun Wang,Hui Ge,Baigang An,Dongying Ju,Maorong Chai,Lixiang Li,Weimin Zhou
To provide an effective method of green aquaculture, the photocatalysts of CuO/ZrO2/CB/coal-tar-pitch-SAC, which have visible light sterilization capacity, were successfully fabricated by coating ZrO2and CuO on the surface of CB/coal-tar-pitch-SAC. The structures of synthesized CuO/ZrO2/CB/coal-tar-pitch-SAC were investigated by XRD, XPS and SEM measurements in detail. It was observed that CuO/ZrO2/CB/coal-tar-pitch-SAC materials possess obvious heterojunction structure and excellent visible light sterilization capacity when the prepared weight ratio of CuO, ZrO2and CB/coal-tar-pitch-SAC is controlled as 0.03:0.3:1. Our studies can provide a beneficial reference for the design of photocatalysts with sterilization capacity in visible light.Keywords:photocatalyst;heterojunction;coal tar pitch;green aquaculture;ZrO2
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 39
·13704-13712
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IF 7.393
Xinran Fu,Qiying Wang,Jingtao Wang,Zhijian Huang,Xueqian Li,Da Wen,Junyu Fang,Bobo Li,Shuang Zhou,Haixi Zhang
Solution processed perovskite photodetectors have attracted extensive interest in recent years. For future commercialization, highly efficient and stable devices need to be realized. Herein, we demonstrate that by introducing low-cost polystyrene microspheres as light scattering media in a p–i–n perovskite photodetector, enhanced photoelectric conversion rate can be obtained. Based on Mie scattering theory, a theoretical design was firstly executed to calculate the optimized microsphere size and then applied to the fabrication of the detector. After embedding microspheres, the high photocurrent and responsivity under 760 nm incident light illumination (light intensity P = 1.0 mW cm−2) reached 19.05 μA and 0.32 A W−1, respectively, which were nearly twice enhancements in comparison with the pristine device. Similarly, the improvement of detector performance response to 530 nm incident light was observed for the polystyrene microsphere embedded device. The maximum responsivity up to 0.45 A W−1 (P = 1.0 mW cm−2) and on/off ratio up to 104 were achieved. This work provides an effective design and implementation strategy to improve responsivity to specific light illumination for perovskite photodetectors.
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Journal of Energy Chemistry
·
2021
·
IF 9.676
Jiale Li,Wenjing Qi,Yameng Li,Sumin Jiao,Hao Ling,Peng Wang,Xin Zhou,Khumal Sohail,Guangcai Wang,Guofu Hou,Jingshan Luo,Ying Zhao,Liming Ding,Yuelong Li,Xiaodan Zhang
Metal halide perovskite-based solar cells (PSCs) have rapidly-increased power conversion efficiency (PCE) exceeding 25% but poor stability especially under ultraviolet (UV) light. Meanwhile, non-radiative recombination caused by diverse defects in perovskite absorbers and related interfaces is one of the major factors confining further development of PSCs. In this study, we systematically investigate the role of 2-(2-hydroxy-5-methylphenyl)benzotriazole (UVP) additive in perovskite layers. By adjusting the amount of doped UVP, the quality of perovskite absorbers is significantly improved with enlarged grains, longer lifetime and diffusion length of charge carriers. Furthermore, UVP not only reduces defects for less non-radiative recombination, but also matches energy level alignment for efficient interfacial charge extraction. X-ray photoelectron spectroscopy confirms that N-donor of UVP molecule coordinates with undercoordinated Pb 2+ on the surface. Interestingly, UVP incorporated in PbI 2 protects the perovskite by absorbing UV through the opening and closing of the chelating ring. Eventually, the UVP treated PSCs obtain a champion PCE of 22.46% with remarkably enhanced UV stability, retaining over 90% of initial PCE after 60 mW/cm 2 strong UV irradiation for 9 h while the control maintaining only 74%. These results demonstrate a promising strategy fabricating passivated and UV-resistant perovskite materials simultaneously for efficient and stable perovskite photovoltaics.
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