Chem
·
2022
·
IF 25.832
Wen-Min Zhang,Kai-Wen Feng,Rong-Gui Hu,Yan-Jun Guo,Yang Li
Formic acid (HCO 2 H) plays a key role in various chemical processes and industrial procedures, acts as a hydrogen-storage candidate, and acts as a key intermediate for streamlined hydrogen production from biomass. Therefore, development of efficient HCO 2 H production from renewable biomass instead of multiple-step production from the diminishing fossil resource is more attractive. We describe the development of visible-light-induced iron redox-catalyzed selective transformation of biomass and derivatives into formic acid in up to 91% yield at ambient temperature under mild conditions. Mechanistic studies indicate that the transformation occurs possibly through multiple sequences of iron(III)-catalyzed ligand-to-metal charge transfer (LMCT), β -scission, hydrogen atom transfer (HAT), and iron(II)-catalyzed single-electron transfer (SET). The selectivity toward formic acid is controlled by cooperation of the catalyst loading, light energy, and oxygen (O 2 ) concentration. A new mode for cleavage of C–C bonds in complex biomass is opened.
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2022
·Vol. 66
·期 3
·1180-1188
·
IF 8.64
Luo Weihua,Xu Xingtang,Tang Yiyuan,Wu Zhen,Wang Guojie
Stimuli-responsive aggregation-induced emission (AIE) materials with regulated color and fluorescence have shown promising applications in smart optical systems, while most of them are only regulated by a single stimulus. Herein, a cyanostilbene-based fluorophore ( Z -BDPA) with AIE enhancement properties is elaborately designed, which exhibits multiple regulable color and fluorescence owing to its various photochemical reactions and reversible pH response. After exposure to 420 nm light, the green emission of Z -BDPA in tetrahydrofuran (THF) becomes brighter owing to the Z→E isomerization, which can be recovered under 365 nm irradiation; the yellow fluorescence of Z -BDPA in THF/H 2 O mixtures with 90% water fraction ( f w ) becomes stronger yellow-green fluorescence due to the photodimerization. At acidic conditions, Z -BDPA powder with yellow fluorescence can become another AIEgen Z - p -BDPA with blue fluorescence via protonation, which would be recovered through deprotonation under basic conditions. Under ultraviolet light irradiation, the blue fluorescence of Z - p -BDPA is blue-shifted and increased due to the photo-isomerization and subsequent photocyclodehydrogenation reactions. Based on the regulable color and fluorescence upon the photochemical and pH responses, Z -BDPA has been successfully applied in photo-patterning and anti-counterfeiting.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yanyan He,Lulu Zhang,Guantong Chen,Yuanhong Liu,Shuangshuang Shi,Panpan Jiang,Jie Ding,Shu Xu,Chong Geng
Achieving long-term stable lead halide perovskite nanocrystals (PNCs) in light-emitting devices remains a significant challenge because of their fast degradation upon exposure to light, moisture, and oxygen. Here, we report a facile one-pot strategy to realize the growth of crystalline ZnO/SiO 2 dual-layer encapsulation on CsPbBr 3 PNCs. The encapsulation provides the PNCs with robust surface passivation to withstand the harsh condition in hybrid light-emitting diodes (LEDs) with an on-chip packaging structure. The PNCs/ZnO/SiO 2 could preserve 100 % of their initial photoluminescence intensity after 500 h of continuous irradiation under a 9.6 W cm −2 blue laser. The fabricated green- and white-LEDs displayed constant light intensity at 80 % of their initial value with continuous driving at 10 mA for 500 h. We believe the excellent stability of the ZnO/SiO 2 encapsulated PNCs could strongly promote the development and application of perovskite-based light-emitting and other optoelectronic devices.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Hainan Wei,Fanming Meng,Jialong Li,Wenqing Yu,Han Zhang
Antibiotics have gradually become a new pollutant in water, which seriously threatens human health. The development of efficient and easily recyclable photocatalysts is urgently needed to achieve water purification. Herein, a novel FeIn 2 S 4 /Bi 2 MoO 6 Z-scheme heterostructural composite is successfully synthesized by a simple heat-shrinkable polymerization solvothermal method. When the doping FeIn 2 S 4 mass fraction is 10%, the degradation rate of tetracycline hydrochloride (TCH) is the highest, reaching 83.25%, which is 1.97 and 2.38 times higher than that of pure FeIn 2 S 4 and Bi 2 MoO 6 , respectively. After five consecutive cycles, the degradation rate still reached 72.35%, which has high photocatalytic stability. Combined with energy band structure analysis, active substance capture experiments and modeling with density functional theory calculations confirm the photocatalytic mechanism of Z-scheme heterostructure. This project proposes a promising and feasible method for the preparation of Z-scheme heterostructured photocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xinyi Mei,Kege He,Rongshan Zhuang,Mubing Yu,Yong Hua,Xiaoliang Zhang
Lead halide perovskite quantum dot (QD) shows great potential for application in light-emitting diodes (LEDs) due to its high photoluminescence quantum yield (PLQY), high exciton binding energy, tunable emission spectra and solution processibility. However, the dynamic binding of conventional organic acid/amine ligands to the QD surface significantly deteriorates its optoelectronic properties and stability, to a large extent affecting the electroluminescence performance of QD-based LEDs. Herein, the zwitterionic molecule, betaine (BET) that could firmly anchor on the QD surface, is introduced to stabilize the dynamic surface and simultaneously passivate the surface defects of QDs. Systematically experimental studies and theoretical calculations reveal that BET-treatment could remove the dynamically bonded OA/OAm ligands and substantially diminish the surface defects of QDs, leading to a boosted PLQY of up to 92 % with improved stability of BET-QDs. Consequently, the electroluminescence performance of green-emitting QD-LEDs was largely improved that the external quantum efficiency was increased to 10.8 %, along with a decreased turn-on voltage of 3.2 V. This work provides new insights into the design criterion of surface ligands for modulating the surface chemistry of perovskite QDs to realize high-performance LEDs or other optoelectronic devices.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Zelin Shan,Fang Ma,Shijie You,Lianbin Shan,Deyong Kong,Haijuan Guo,Chongwei Cui
Efficient photo-Fenton removal of antibiotic effluent is a widely followed and significant attempt to deal with the growing environmental pollution . In this study, BiFeO 3 and lanthanum doped BiFeO 3 catalysts were synthesized via one-step hydrothermal method as hydrogen peroxide activator for mineralization of norfloxacin (NOR). Various characterization measurements were used to verify La was successfully doped into the lattice of perovskite and investigated the effect of La doping molar ratio on BiFeO 3 through the characterization of the morphology and physicochemical properties . The degradation experiment and reaction rate constants showed that the La-doped BiFeO 3 particle exhibited superior photo-Fenton catalytic performance to undoped BiFeO 3 . Especially, the degradation efficiency of 15% La-doped BiFeO 3 could reach up to 84.94%. And the first order kinetic constant of optimized conditions was 0.01638 min −1 , which was about 6.9 times than that of undoped BiFeO 3 .The influence of pH, oxidizer content and catalyst dosage in photo-Fenton reaction were investigated detailedly. Besides, the synthetic catalyst possessed favorable stability and reusability with little metal leaching after many cycles of use. Radical scavenger experiments and electron spin resonance tests were carried out to conclude that the ·OH and holes were regarded as the dominate active species in the catalytic process. The narrow band gap and excellent electron transfer efficiency were the key factors for La-doped BiFeO 3 to have high catalytic efficiency in the photo-Fenton system. Current works demonstrated the great promise of La-doped BiFeO 3 in the elimination of antibiotic organics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Rui Zhou,Xue-Ying Wu,Qi Zhao,Kai-Kai Liu,Lin Dong,Chong-Xin Shan
ZnO nanoparticles (NPs) have been synthesized by a facile one-step synthesis method, and the emission color of the ZnO NPs can be tuned from orange to yellow, green, blue-green and blue. These ZnO NPs were used as phosphors to fabricate UV-pumped white light-emitting diodes (WLEDs). The color rendering index of the WLEDs is (0.31, 0.33), which is close to the standard white emission. The WLEDs have high correlated color temperature (6532 K) and Commission International de L'Eclairage (90.4). These results indicated that the multi-colored ZnO NPs have great application potential in lighting and display.
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Congcong Yin,Zhe Zhang,Zhenshu Si,Xiansong Shi,Yong Wang
Constructing gated ion transport channels is of profound significance for a variety of applications but remains challenging. Covalent organic frameworks (COFs), as a new class of reticular materials, have demonstrated superiority in controllable transport and precise separation of fine species including ions. Herein, we engineer a light-responsive COF featuring intrapore azobenzene groups for highly efficient and adjustable transport of multivalent ions. Such azobenzene-tagged channels afford a customizable configuration that is precisely switchable at an angstrom level without compromising crystallinity. The membrane-shaped COFs exhibit an exceptional discrimination capability between monovalent and multivalent ions, rendering a K+/Al3+ selectivity of above 6000. Particularly, the azobenzene-decorated ordered nanochannels empower reversible, remote-controlled ion transport, implementing the tailor-made recycling of ionic adjuvants used for antibiotic production. This study reports the design and synthesis of a stimulus-responsive COF and demonstrates the efficient separation of ions by light-gated nanochannels of the smart COF.
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Yawen Zhou,Shuai Zhang,Shanggeng Li,Jing Li,Ning Li,Lin Zhang
Carbon dots (CDs) have gained tremendous attention over a wide range from fluorescence sensors to optoelectronic devices . In this context, N, S-codoped carbon dots (MO-CDs) of 2.7 nm were synthesized via a facile hydrothermal method using a single precursor Methyl Orange (MO). Upon excitation at 430 nm, the MO-CDs exhibit a yellow emission with an absolute quantum yield (QY) of 15.3%. In addition, the as-prepared MO-CDs possess excellent resistance to high ion strength , high H 2 O 2 concentration, and UV exposure. Because of their good fluorescence properties, a light-emitting diode (LED) device that emits yellow light was fabricated by mixing MO-CDs and siloxane. Moreover, the electrospun nanofibers with yellow fluorescence were prepared by electrospinning technology. This work shows that the CDs derived from MO possess special fluorescent characteristics, which can be utilized as a multifunctional carbon material.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Cong Xie,Aiyu Zhang,Ling Chen,Ping Yang
Red-emitting CsPbI3 perovskite materials are still limited in various commercial applications because of their stability being related to the morphology and dimension. In this paper, a solvothermal method was developed to fabricate CsPbI3 perovskite nanomaterials with governable morphologies (e.g., nanoplatelets (NPLs) to nanocubes (NCs)) and dimensions ranging from the zero-dimensional (0D) Cs4PbI6 to the three-dimensional (3D) CsPbI3. By adjusting the amount of Cs precursor solutions, the photoluminescence (PL) peak position of the samples was tuned over the whole red-emitting region (from 607 to 700 nm). In addition, the reaction temperature affected the PL properties of the samples and demonstrated that temperature was critical to control the performance of CsPbI3 perovskite materials. Furthermore, sodium dodecyl benzene sulfonate (SDBS) was chosen as the additive to improve the stability of the prepared samples. The result provided an approach to get CsPbI3 perovskite nanocrystals with stabile PL. Finally, CsPbI3 NPLs embedded in the polystyrene film displayed bright and stable white light emission.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2022
·
IF 4.494
Na Wang,Yan Xiong,Kunjie Liu,Shihui He,Jindong Cao,Xusheng Zhang,Jing Zhao,Quanlin Liu
Phosphors with narrow-band emission are in great demand for liquid crystal display backlighting applications. In this work, four zero-dimensional Mn2+-based organic–inorganic metal halides (OIMHs), (C13H26N)3MnBr4·Br, (C13H26N)2MnCl4, and (C7H18N)2MnX4 (X = Cl, Br), were synthesized, and their crystal structures were solved. Under blue-light excitation, all of the materials exhibited bright narrow-band green luminescence centered at 515–525 nm with high photoluminescence quantum yields (PLQYs). Significantly, (C13H26N)3MnBr4·Br and (C13H26N)2MnCl4 exhibited small full width at half-maximum (FWHM) values of 43 and 48 nm with PLQYs of 77.8 and 79.3% at room temperature, respectively. Compared with the reported luminescent OIMHs, ultrahigh thermal quenching temperatures were observed, and at 420 K, emission intensities of (C13H26N)3MnBr4·Br and (C13H26N)2MnCl4, remained 82.7 and 64.2% of those at room temperature, respectively. The rigid environment provided by the C13H26N+ cation has a strong confinement effect on the [MnX4]2– tetrahedra, leading to a narrower FWHM and higher thermal quenching temperature. Finally, (C13H26N)3MnBr4·Br was combined with commercial phosphors to fabricate light-emitting diodes (LEDs) with a wide color gamut of up to 113% NTSC (National Television System Committee). This work provides a reference for designing the OIMHs for liquid crystal display LEDs by tuning the organic cations.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 20
·2201112
·
IF 10.05
Peiyuan Pang,Zhaohui Xing,Junmin Xia,Bingzhe Wang,Zhipeng Zhang,Jia Guo,Tanghao Liu,Bingchen He,Jiangshan Chen,Shi Chen,Guichuan Xing
In the past several years, metal-halide perovskites have attracted much attention for their promising applications in light-emitting diodes (LEDs). Significant progress has been made in the development of high-efficiency green, red, and near-infrared perovskite LEDs (PeLEDs), but blue PeLEDs are still lagging behind. Although the external quantum efficiency (EQE) of blue PeLEDs has exceeded 10%, these works mainly focus on pure blue and sky-blue regions. Creating deep-blue electroluminescence (EL) with high stability, efficiency, and color purity is still a great challenge for PeLEDs. Herein, deep-blue PeLEDs are reported which have been constructed with a mixture of a quasi-2D phase and a nanocrystal phase by introducing a small diamine cation, ethylene diammonium (EDA 2+ ), and the effect of EDA 2+ on quasi-2D perovskite crystallization is investigated. EDA 2+ with two amino ending groups has a stronger inhibitory effect on high- n phase growth than phenylethyl ammonium, leading to the formation of small nanocrystals. Further introduction of Na + reduces the size of the nanocrystals and broadens the band gap. Based on these improvements, deep-blue PeLEDs with EL peaks at 467 (EQE ≈ 1.7%) and 461 nm (EQE ≈ 1.1%) are successfully constructed. Thus, this study provides a useful strategy for improving the performance of deep-blue PeLEDs.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）