ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Meilin Lv,Gang Liu,Xiaoxiang Xu
Strong visible light absorption and high charge mobility are desirable properties for an efficient photocatalyst, yet they are hard to be realized simultaneously in a single semiconductor compound. In this work, we demonstrate that these properties coexist in homologous compounds ZnnIn2O3+n (n = 4, 5, and 7) with a peculiar layered structure that combines optical active segment and electrical conductive segment together. Their enhanced visible light absorption originates from tetrahedrally or trigonal-bipyramidally coordinated In atoms in Zn(In)O4(5) layers which enable p–d hybridization between In 4d and O 2p orbitals so that valence band minimum (VBM) is uplifted with a reduced band gap. Theoretical calculations reveal their anisotropic features in charge transport and functionality of different constituent segments, i.e., Zn(In)O4(5) layers and InO6 layers as being for charge generation and charge collection, respectively. Efficient photocatalytic hydrogen evolution was observed in these compounds under full range (λ ≥ 250 nm) and visible light irradiation (λ ≥ 420 nm). High apparent quantum efficiency ∼2.79% was achieved for Zn4In2O7 under full range irradiation, which is almost 5-fold higher than their parent oxides ZnO and In2O3. Such superior photocatalytic activities of these homologous compounds can be understood as layer-by-layer packing of charge generation/collection functional groups that ensures efficient photocatalytic reactions.
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2017
·Vol. 4
·期 7
·1100-1107
·
IF 4.036
Yanna Chen,Donghai An,Min Zhang,Cong Hu,Miriding Mutailipu,Zhihua Yang,Xiaoquan Lu,Shilie Pan
A new lithium zincoborate Li6Zn3(BO3)4 has been successfully prepared via a high-temperature solution method. Li6Zn3(BO3)4 is composed of LiO4 and ZnO4 tetrahedra, and nearly coplanar BO3 units. A face-sharing LiO4 configuration was found in the title compound, and a comparison of Li–O configurations was systemically investigated for all Li-containing borates. Interestingly, Li6Zn3(BO3)4 has two reversible phase transitions at about 341 and 706 °C, which implies that Li6Zn3(BO3)4 is a potential candidate as a phase change material. In situ high-temperature X-ray diffraction (XRD) and differential scanning calorimetry (DSC) analysis were used to verify the two reversible phase transitions. The linear optical properties were researched in detail using ab initio density functional theory (DFT).
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高影响因子
Chinese Physics B
·
2018
·Vol. 27
·期 1
·016402
·
IF 1.321
Xue Min,Jiangjian Shi,Linbao Guo,Qing Yu,Pengpeng Zhang,Qingwen Tian,Dongmei Li,Yanhong Luo,Huijue Wu,Qingbo Meng,Sixin Wu
The Zn/Sn ratio in Cu2ZnSn(S, Se)4 (CZTSSe) films has been regulated to control the composition-related phase, defect, and photoelectric properties for high performance kesterite solar cells. It is found that the increase in the Zn/Sn ratio can slightly narrow the energy band gap to extend the light absorption range and improve the photocurrent. Optimal Zn/Sn ratio of 1.39 in CZTSSe film is obtained with the least secondary phase, the lowest defect density, and the longest charge recombination lifetime. Up to 10.1% photoelectric conversion efficiency has been achieved by this composition regulation.
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INTEGRATED FERROELECTRICS
·
2014
·
IF 0.371
Mi Ouyang,Pingjing Wang,Zhiyan Fu,Cheng Zhang
A novel copolymer based on bis(4-(1H-pyrrol-1-yl)phenyl)methane (BPM) and 3,4-ethylenedioxythiophene (EDOT) is successfully synthesized and characterized through electrochemical methods. The polymer film exhibits three distinct colors (khaki, yellow green, midnight blue) under different potentials, reasonable optical contrast (10% at 422 nm, 5% at 1100 nm) and fast swiching time (2.6 s at 422 nm, 2.2 s at 1100 nm). Beside, SEM images illustrates that the copolymer film presents a much smoother surface than that of the respective homopolymers, which means that the copolymer film have great potential in electrochromic device fabrication.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Zhiyuan Ding,Jin Zhao,Zelin Hao,Minjie Guo,Liang Li,Nan Li,Xuyang Sun,Peibin Zhang,Jing Cui
A glassy carbon electrode (GCE) modified by a hybrid, macroporous carbon (MPC) functionalized with triazine bridged covalent organic polycalix[4]arenes (CalCOP) (CalCOP-MPC), has been fabricated and utilized for simultaneous detection of nitrophenols (NP). The obtained CalCOP-MPC were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy , X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS), which confirmed that MPC had functionalized with CalCOP successfully. Benefiting from the synergistic supramolecular effect of macrocyclic receptor of CalCOP and the excellent electrical properties of MPC, the anodic peaks of o -nitrophenol ( o -NP), m -nitrophenol ( m -NP), and p -nitrophenol ( p -NP) in their mixture can be well separated by the prepared electrode. Differential pulse voltammetry (DPV) measurements at CalCOP-MPC/GCE revealed that the linear ranges of NP isomers were all 1–400 μ M, and the detection limit limits were 0.383 μ M, 0.122 μ M, and 0.212 μ M for o -NP, m -NP, and p -NP, respectively. Moreover, the prepared modified electrodes showed a relatively good selectivity and stability, implying the prospect for detecting NP in real environmental samples.
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高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Qingqing Sun,Yanchao Lü,Lingling Liu,Kaiqiang Liu,Rong Miao,Yu Fang
The supramolecular approach plays a pivotal role in the construction of smart and functional materials due to the reversible nature of noncovalent interactions. In the present work, two compounds, cholesterol-functionalized calix[4]pyrrole (CCP) and perylene bisimide diacid (PDA), were synthesized. Little fluorescence is observed in the ethanol solution of the mixture of CCP and PDA, while the solution turns fluorescent upon introduction of ammonia, which is attributed to the formation of a supramolecular ensemble, PDA/(CCP)2/NH3. The fluorescence emission of the as-formed ensemble is sensitive to the presence of phenol, an electron-rich analyte. Interestingly, the sensing can also be observed in the film state, and the relevant detection limit (DL) is lower than 1 ppb. Moreover, the sensing could also be performed in a visualized manner. Upon the basis of the findings, a sensor device with instant response and good reversibility was developed. Further studies revealed that the as-developed fluorescent ensemble is also sensitive to the presence of TNT, an electron-poor compound. The DL for this sensing is ∼80 nM. To our knowledge, this is the first report that a fluorescent sensor could be used for phenol sensing in the vapor state, and for sensing of both electron-rich and electron-poor analytes in solution state. It is believed that the present study presents a distinctive example that demonstrates how smart sensing is realized via combination of the host–guest chemistry of calix[4]pyrrole and the aggregation and disaggregation property of PBI derivatives.
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高影响因子
Frontiers in Chemistry
·
2019
·
IF 3.782
Yan Huihui,Xiao Xu-Qiong,Hider Robert C.,Ma Yongmin
A new series of 3-substituted 4-methylene-quinazolinthiones and 4-methylene-quinazolinones were synthesized in moderate to excellent yield through a simple reaction of 2-aminoacetophenones with isocyanates or isothiocyanates. The reaction shows good tolerance of many important functional groups in the presence of air and water under metal-free conditions. Only water is produced as a coproduct, rendering this “green” methodology a highly versatile and eco-friendly alternative to the existing methods for the construction of the quinazolinone/quinazolinthione framework. We have interpreted the reaction mechanism by use of quantum chemical calculations on the basis of state-of-the-art computational methods SMD-B3LYP-D3(BJ)/BS1//B3LYP/BS1.
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PubMed
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Tiandong Zhang,Haixin Ma,Tianyuan Yin,Zining Pu,Xue Zhang,Lin Li,Chao Yin,Changhai Zhang,Qingguo Chi
Biaxially oriented polypropylene (BOPP) are the most popular dielectric materials that used in the film capacitors products, however, the maximum operating temperature of BOPP films is only 105 °C, which limits its application in the extreme high-temperature and high-field conditions. Thus, it is urgent to develop the new-typed dielectric films with excellent energy storage performance at elevated temperature for meeting the requirements of new energy vehicles and high-voltage-direct transmission engineering. Recently, non-polar polyolefin poly (4-methyl-1-pentene) (PMP) dielectrics with superior high-temperature endurance and exhibit great potential to replace BOPP. In this work, PMP films have been successfully fabricated by melt casting technique and achieved mass-production. To further improve the high-temperature energy storage performance of PMP dielectric films, we propose a cooperative modulation of the multiscale structures including molecular chains and surfaces. In detail, UV-irradiation grafting of trifluoroethyl methacrylate (TFEMA) onto PMP molecular chains creates “bulk-traps” through polar group effects, which can effectively trap electric charges and reduce conduction loss at high-temperature. Meanwhile, the AlN/PZT heterostructured inorganic barrier layers are deposited onto the surfaces of TFEMA-grafted-PMP films via magnetron sputtering technique. The energy band structure differences between AlN/metal electrodes and AlN/PZT interfaces were utilized to construct interface barriers, thereby suppressing charge injection from metal electrodes and reducing high-temperature conduction losses. The results demonstrate that the high-temperature energy storage performances of the films have been significantly improved by optimizing UV irradiation duration and inorganic barrier layer thickness. At 150 °C, a discharged energy density of 4.23 J/cm 3 with η maintained above 91 % has been achieved, while the films exhibit excellent cycling stability of charge-discharge performances.
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产品关联
DOI
高影响因子
FUEL
·
2026
·
IF 7.8
Bingshuo Li,Xinhang Lv,Tianhua Yang,Haijun Zhang,Xingping Kai,Rundong Li
Catalytic hydrodeoxygenation (HDO) is a promising strategy for upgrading phenolic bio-oil into cycloalkanes. Conventional catalysts often rely on strongly acidic supports, which tend to suffer from rapid deactivation. In this study, 4-ethylphenol was selected as a model compound derived from lignin bio-oil to investigate the effects of active sites on an inert support during the hydrogenation and deoxygenation of the phenolic group. Acid-site–support decoupling catalysts, denoted as Ni-HSiW/h-BN, were successfully prepared and were applied in the HDO of 4-ethylphenol to produce ethylcyclohexane. Using 0.5 g of 4-ethylphenol as the substrate and n-dodecane (30 mL) as solvent, the optimal reaction conditions were identified as a temperature of 300 °C, a reaction time of 3 h and the use of 15% Ni-HSiW 0.25 /h-BN catalyst. Under these conditions, complete conversion of 4-ethylphenol was achieved with 100% selectivity toward ethylcyclohexane. When the temperature was lowered to 180 °C and the reaction time reduced to 1 h using 15% Ni/h-BN, the main product shifted to ethylcyclohexanol with a selectivity of 94.4%. A reaction mechanism was proposed, indicating that the combination of Ni and HSiW synergistically enhances HDO efficiency.
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高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Zhirong Ren,Shaozhen Liu,Jiaxin Wang,Haihan Zhou
Flexible supercapacitors (SCs) with a sandwich structure constructed using traditional current collectors usually exhibit poor utilization of electroactive materials and unsatisfactory mechanical deformation stability. In this work, a novel polyvinyl alcohol-4-carboxyphenylboronic acid hydrogel-coated graphite paper (PVA-CPBA/GP) current collector is developed. The CPBA dopants covalently immobilized on PVA chains act as anchoring sites, promoting the dispersed growth of polypyrrole (PPy) within the 3D hydrogel network. The resulting PPy@PVA-CPBA electrode with an interpenetrating network structure shows evidently enhanced electrochemical performance compared to PPy/PVA and PPy electrodes. Using the PVA-CPBA/GP current collector, a separator-free back-to-back flexible SC is also constructed successfully. The device exhibits an areal capacitance of 110.2 mF cm⁻ 2 at 0.5 mA cm⁻ 2 , retains 82.6 % of its initial capacitance after 10,000 cycles, and maintains 83.8 % of its initial capacitance after 1000 bending cycles. These performance metrics are significantly higher than those of the PPy/PVA SC as a control. This work demonstrates that the developed PVA-CPBA/GP current collector not only promotes the highly efficient utilization of PPy, enhancing the capacitive performance and cycling stability of the SC, but also enables the construction of a separator-free back-to-back flexible SC, thereby improving its mechanical deformation stability. The hydrogel-based current collector we propose presents a new perspective for developing high-performance flexible SCs.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 5
·816-820
·
IF 1.063
Chu Ning,Xu Shuping,Xu Weiqing
Two different kinds of configurations of 1,4-bis[2-(4-pyridyl)ethenyl]-benzene( trans -bpeb and cis -bpeb) were achieved, and a bpeb dimer was synthesized in dimethyl sulfoxide(DMSO). Compared with the previous work that synthesized the bpeb dimer or polymer in crystal with a template agent needed, the reaction occurred in a solution phase in the present method. A hand-held ultraviolet lamp(365 nm) with the power of 12 W and the Watt density of 0.35 mW/cm 2 can realize the photodimerization of bpeb, instead of the high-power mercury lamp in most previous studies. Unlike other 2+2 cycloaddition in liquid state using catalysts even noble metals, no catalysts were required here, which is cost-saving. Only the trans -pbeb can start the cycloaddition and the formation of the close J-aggregations of trans -pbeb in DMSO is a precondition for explaining the 2+2 photodimerization. The productivity for the 2+2 cycloaddition product was achieved as 55.6%.
研究领域:
有机化学
·
光化学
·
超分子化学
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材料化学
·
合成方法学
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高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 17
·10260-10268
·
IF 10.7
Yingfen Li,Xingye Chen,Runxi Wang,Nian Zhou,Fang Huang,Jun Zhao,Zhenghua Su,Shuo Chen,Guangxing Liang
In this study, Sb2S3 was introduced into the two-step selenization process to promote bottom grain growth and reduce the surface roughness of the Cu2ZnSn(S,Se)4 light-absorber layer. The introduction of Sb doping in Cu2ZnSn(S,Se)4 can passivate bulk and interface defects and a small conduction band offset (CBO) can be found, which facilitate the improvement of heterojunction carrier transport properties. Similarly, simulations illustrated that Sb doping improved device efficiency by controlling bulk and interface defects and band alignment. This optimized method facilitated the penetration of Sb, resulting in a high-quality CZTSSe absorber layer. Ultimately, the research culminated in a significant enhancement, yielding a solar cell with an impressive efficiency of 13.11%. These findings offer new possibilities for kesterite solar cells and advance the potential of CZTSSe materials in thin film photovoltaic applications.
研究领域:
材料科学
·
光伏技术
·
半导体物理
·
薄膜太阳能电池
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无机功能材料
·
固态电子学
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高影响因子
危险品化学品经营许可证（带存储）