DYES AND PIGMENTS
·
2018
·
IF 3.767
Xiao-Lei Zhao,Jiao Geng,Bin Hu,Dan Xu,Wei Huang
New monomethine dyes have been prepared by a simple and highly efficient method in acetic anhydride, in which the common pyridine-2,6-dione moiety and thiophene derivatives occupy each side of the methine unit. Among them, the ternary monomethine-azo dyes were first obtained by the particularly useful post-modification synthetic strategy, in order to further adjust the π -conjugated system and electronic spectra of 2-amino-3-cyano-4-chloro-5-formylthiophene based heterocyclic hydrazone/azo dyes. UV−Vis spectral analyses reveal that the synthesized heterocyclic dyes exhibit a large color gamut because of the extension of the conjugation length of the chromophore , where the maximum absorption wavelength ( λ max ) is significantly red-shifted up to 181 nm from binary monomethine to ternary monomethine-azo dyes.
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Ning An,Zhuhang Shao,Zhen Guo,Jiao Xin,Yuanyuan He,Liwen Lv,Kefeng Xie,Xiuyan Dong,Yang Zhang,Zhongai Hu
In this work, we select a novel multi-redox poly (1, 5-diaminoanthraquinone) (PDAAQ) as electroactive material and Cetyltrimethylammonium bromide (CTAB) modified graphene oxide (CGO) as conductive substrate. Benefit from the excellent dispersion of CGO in organic polymerization medium and the abundant functional groups on the surface of CGO, 1, 5-diaminoanthraquinone (DAAQ) monomers may covalently graft on the conducting substrates and realize the directional growth of PDAAQ via the in-situ chemical oxidative polymerization. In three-electrode system, the optimization of PDAAQ/CGO electrode exhibits a high specific capacitance of 760 F g −1 at 1 A g −1 and superior electrochemical stability of 90.4% after 10 000 cycles. Most importantly, the electrochemical kinetic behavior of PDAAQ/CGO electrode is studied in detail. The result indicates that the energy storage process of PDAAQ/CGO is a synergistic result of diffusion-controlled process and capacitive effects, and the latter one is dominant. According to the simulation calculation of kinetic model , the capacitive contribution ratio of PDAAQ/CGO can be as high as 80.6% at a scan rate of 50 mV s −1 . Finally, the as-fabricated asymmetric supercapacitor (ASC) can deliver an energy density up to 41.1 W h kg −1 at a power density of 1000 W kg −1 , indicating a great potential application in high performance supercapacitors .
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 35
·e202402568
·
IF 1.9
Rui Zhu,Xinglong Li
Graphical A photocatalytic selective oxidation strategy for preparing DFF from HMF is developed, using Ag/Ag 3 PO 4 as the photocatalyst and O 2 as the oxidizing agent. In contrast to previous photocatalytic oxidation strategies for HMF transformation, this catalytic system could efficiently generate 1 O 2 without other ROS under visible light irradiation. DFF would be obtained with 88 % selectivity with the optimal reaction conditions. The synthesis of 2,5-diformylfuran (DFF) through photocatalytic oxidation of 5-hydroxymethylfurfural (HMF) is an attractive approach. In this manuscript, a photocatalytic selective oxidation strategy for HMF was developed, using Ag/Ag 3 PO 4 as the photocatalyst and O 2 as the oxidizing agent. The prepared catalyst was characterized systematically by SEM, XRD, XPS, UV-Vis, PL spectra, and so on. In contrast to previous photocatalytic oxidation strategies for HMF conversion, this catalytic system could efficiently generate 1 O 2 without other reactive oxygen species (ROS) under visible light irradiation. DFF would be obtained with about 90 % selectivity. Moreover, the exclusive formation of 1 O 2 was linked to the more positive conduction band potential (+0.90 eV) of Ag/Ag 3 PO 4 , confirmed by an array of characterization techniques. Additionally, the stability of the catalyst was assessed through cyclic testing and analyses including XRD, and XPS. Nonetheless, this catalytic system could potentially serve as a robust platform for various selective oxidation reactions in the future, due to its exclusive presence of 1 O 2 without the involvement of other ROS.
✓ 已验证
DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Jun Zhang,Kaijun Dong,Weimin Luo,Haifeng Guan
Sulfonic acid modified organic hyper-cross-linked polymer (HCP) based carbocatalyst with variable –SO 3 H density and porosity, was synthesized for the one-pot conversion of biomass derived carbohydrates into potential fuel candidate 5-ethoxymethylfurfural (EMF). The structural characterizations revealed that the porous structure of HCP was well maintained after sulfonation process, thus rendering good structure and high Brϕnsted acid density for the one-pot dehydrative etherification reaction. The as-prepared HCP materials exhibited promising catalytic performance for ketoses conversion, which yielded 78.9% of EMF along with 15.4% 5-hydroxymethylfurfural (HMF) and 4.6% ethyl levulinate (EL) using fructose as starting material in ethanol-DMSO biphasic system. Meanwhile, considerable increase in EMF yield from glucose based carbohydrates was attained when adding slight amounts of Lewis acid AlCl 3 to reaction protocol. The HCP based catalyst was able to be reused several times without significant loss in catalytic activity. More importantly, the HCP materials were also highly active in other related acid-catalyzed reactions, including esterification, transesterification and dehydration.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yunjia Hu,Tengchao Guo,Kangsen Peng,Shujuan Tan,Cheng Xu,Jie Deng
In this study, Ce 1−x Cu x O 2−x (x = 0, 0.01, 0.03, 0.05, 0.07) samples were prepared by hydrothermal method . The structure, microstructure, and elemental composition of the powders were characterized by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy, whereas the electrical conductivity , ultraviolet–visible absorption spectroscopy , and infrared emissivity at 3–5 μm were measured as well. Moreover, the effects of Cu 2+ doping concentration on the microstructure, morphology, bandgap, conductivity, and infrared emissivity of Cu-doped CeO 2 powders were systematically studied. The effects of Cu 2+ doping on infrared reflection and absorption in a 3–5 μm band and their mechanisms were explained based on electromagnetic theory, lattice vibration absorption, and free carrier absorption . Our result indicated that the emissivity of 1% Cu-doped powder reached the lowest emissivity of 0.200 at 800 °C. When the doping concentration was above 1%, the curve of infrared emissivity versus temperature exhibited a “U” shape, with the minimum point shifting towards the low-temperature region with the increase of Cu doping amount. This phenomenon was attributed to the different enhancement amplitude of reflectivity and absorbance of CeO 2 powder by Cu 2+ at different temperatures.
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1064-1069
·
IF 3.1
He Huan,Zou Zhengxi,Hua Weiming,Yue Yinghong,Gao Zi
A series of ZnO-modified cobaltous ion exchanged ZSM-5 catalysts is prepared using incipient wetness impregnation and characterized by X-ray diffraction (XRD), N 2 adsorption, transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (DR UV-Vis), X-ray photoelectron spectroscopy (XPS), pyridine-adsorbed Fourier transform infrared (Py-IR) and Raman. Their catalytic performance towards CO 2 -assisted dehydrogenation of ethane to ethylene has been evaluated. The addition of ZnO onto CoZSM-5 obviously improved the yield of ethylene as well as the conversion of CO 2 . The promoting effect is attributed to the good activity of ZnO for the reverse water gas shift (RWGS) reaction, which enhances the coupling between RWGS and ethane dehydrogenation.
✓ 已验证
DOI
高影响因子
TRANSITION METAL CHEMISTRY
·
2017
·Vol. 42
·期 4
·273-283
·
IF 1.358
Fang Dong-Lin,Mo Shao-Yin,Wu Kai-Fei,Huang Zhong-Jing
Three coordination polymers have been obtained by hydrothermal synthesis, namely [Zn(imip)(H 2 O) 2 ]·0.5H 2 O ( 1 ), [Co(imip)(H 2 O) 2 ]·0.5H 2 O ( 2 ), and [Cd 2 (imip) 2 (H 2 O) 3 ] ( 3 ) [H 2 imip = 5-(1H-imidazol-1-yl) isophthalic acid]. The coordination polymers were characterized by IR spectra, elemental analysis, powder X-ray diffraction, and thermogravimetric analysis. Furthermore, single-crystal X-ray analysis reveals that they have 2D structures, which are extended into 3D networks via O–H···O hydrogen-bonding interactions. The luminescent properties of these coordination polymers were investigated.
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Hongchen Liu,Jinxiu Qian,Fan Yang,JunPu An,Chunhui Yu,Junwei Yuan,Jiahui Liu,Meitong Zhao,Aocheng Wang,Yongfeng Li
Integrating biomass upgrading via electrocatalytic 5-hydroxymethylfurfural oxidation (HMFOR) with the hydrogen evolution reaction (HER) presents a promising strategy to reduce the energy consumption of green hydrogen production while simultaneously generating high-value chemicals. However, the performance and selectivity of electrocatalysts for these reactions still require further improvement. In this work, a CoP-CeO 2 heterostructure nanosheet array supported on nickel foam (CoP-CeO 2 /NF) was developed as an efficient bifunctional electrocatalyst for both HMFOR and HER. The successful construction of the heterointerface was verified through TEM observations, while XPS analysis confirmed interfacial electron transfer from CoP to CeO 2 . This electronic interaction optimizes the adsorption properties of CoP toward key reaction intermediates, and the abundant oxygen vacancies in CeO 2 enhance adsorptive selectivity toward oxygen-containing groups in HMF. As a result, the optimized CoP-CeO 2 /NF drives HMFOR at a low potential of 1.37 V to achieve 200 mA cm −2 in 1.0 M KOH with 100 mM HMF, and further requires only 1.2 V to reach 10 mA cm −2 in a two-electrode system coupled with HER, which is significantly lower than the voltage required for conventional water electrolysis (1.4–1.6 V). Furthermore, by enhancing the adsorption capability for HMF and reaction intermediates, our electrocatalysts effectively mitigate competition from the oxygen evolution reaction (OER) over a broad potential range, particularly at higher voltages, and maintains a Faraday efficiency above 85 % within 1.3–1.6 V. This work provides a compelling approach to designing bifunctional electrocatalysts for energy-saving green hydrogen production integrated with biomass upgrading.
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Jiaze Chen,Huijie Xie,Yusen Chen,Dong Guo,Binjie Li,Xuanxuan Sun,Volodymyr Turkevych,Caixia Li,Dehong Chen,Lei Wang,Bin Li
Fenton-like degradation based on iron catalyst have been developed to remove organic pollutants from wastewater. However, iron-based catalysts still face challenges of poor accessibility and stability of active sites. Here, we report a facile and green method for the preparation of Fe x Cu (1-x) @HZSM-5 catalyst using ethylenediamine as an organic ligand to stabilize metal species via a combination of solid-state grinding and steam-assisted crystallization methods without organic templates. Due to the confinement of zeolite ZSM-5 framework and synergistic effect of Fe and Cu bimetals, the optimized Fe 0.8 Cu 0.2 @HZSM-5 catalyst exhibits excellent activity and reusability in the Fenton-like degradation of methylene blue at the neutral condition. Our strategy for fabricating bimetal@zeolite can bring about new thoughts for the preparation of iron-based catalyst with high efficiency for Fenton-like degradation.
✓ 已验证
产品关联
DOI
高影响因子
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Yin Wang,Mingqin Xue,Fei Ge,Wenlin Xu,Jianchun Jiang,Minghao Zhou
5-Hydroxymethylfurfural (HMF) played a crucial role in the selective hydrodeoxygenation (HDO) of 2,5-dimethylfuran (DMF). In this work, a series of Cu-MOF-based catalysts were synthesized and applied to the catalytic transfer hydrodeoxygenation (CTHDO) of HMF to produce DMF. Catalyst 2Cu/1BTC-700 exhibited the best catalytic performance, achieving a DMF yield of 95.84 % at 180 °C using isopropanol as the hydrogen donor. Results of detailed characterizations showed the excellent catalytic performance was attributed the appropriate specific surface area, acid sites, the smallest particle size and the synergistic effect between Cu 0 and Cu + species. Mechanistic studies revealed metallic Cu 0 promoted isopropanol dehydrogenation, generating active hydrogen to initiate the CTHDO reaction of HMF, while Cu + acted as Lewis acid sites promoting the activation of the C=O bond and subsequent C–OH cleavage. In addition, the catalyst also had a good reusability, which could give some insights to the high value conversion of HMF.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Dalong Qu,Nan Jiang,Yujie Sun
Electrochemical reconstruction is a well-documented phenomenon in electrocatalysis, yet it has rarely been purposefully harnessed to enhance catalyst performance in a controllable manner. In this study, we introduce a rational electrochemical reconstructing strategy using Ag as a model electrocatalyst and the electrocatalytic hydrogenation of 5-hydroxymethylfurfural (HMF) to 2,5-bis(hydroxymethyl)furan (BHMF) as a benchmark reaction. Through a simple yet effective electrochemical reconstruction approach, we generated preferentially oriented Ag nanoparticles (PO-Ag NPs) with more exposure of the Ag(110) facets, which exhibited significantly enhanced activity and selectivity compared to pristine Ag. The faradaic efficiency of PO-Ag NPs for HMF hydrogenation reached above 95% with a selectivity exceeding 98%. Comprehensive electrochemical, spectroscopic, and computational investigations identify the preferential adsorption of HMF on the Ag(110) facet as the primary factor contributing to the enhanced performance. Furthermore, PO-Ag NPs demonstrated excellent long-term stability, retaining high activity and selectivity over extended electrolysis cycles. These findings highlight electrochemical reconstruction as a powerful and controllable strategy for designing highly efficient electrocatalysts, with broad implications for a wide range of electrochemical transformations beyond hydrogenation.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Mahmoud Mohamed Mohamed Ahmed,Chen Cheng,El-Sayed R.E. Hassan,Jiang Yu,Guangyi Liu
The flotation separation of galena from its ores with traditional xanthate collectors needs the high alkaline media maintained by lime which production releases CO 2. In this study, a novel collector, 5-heptyl-1,3,4-oxadiazole-2-thione (HPODT), was investigated in flotation separation of galena from pyrite under a moderate alkaline pulp without addition of lime. The micro-flotation results demonstrated that at pH ∼10.0, 6 × 10 −6 mol·L −1 HPODT and octyl xanthate sodium (OXS) floated out 99.3 % and 83.8 % galena, as well as 5.3 % and 75.6 % pyrite from their mixture, respectively, deducing the much better selectivity of HPODT for flotation separation of galena against pyrite than OXS. UV spectra exhibited that under pH ∼10.0, the adsorption amount of HPODT on galena was much bigger than that on pyrite, which supported their flotation and contact angle results. In situ AFM gave out clear evidences that HPODT formed self-assembled aggregates on galena surface. XPS confirmed that the exo -S and endo -N atoms of HPODT’s oxadiazole-thione group bonded with the Pb atom(s) on galena to deliver the Pb(II)-HPODT complexes. As a big conjugated configuration, the oxadiazole-thione group possessed the weak electron-donating and strong electron-accepting ability through electron delocalization effect, which improved the selective affinity of HPODT towards Pb(II) on galena against Fe(III)/Fe(II) on pyrite.
✓ 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）