KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2022
·Vol. 39
·期 7
·1744-1752
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IF 3.146
Li Feifei,Dong Jiale,Wang Mingyue,Lin Xingtao,Cai Weijie,Liu Xianyun
This work is mainly concerned with the synthesis of Co-Zn nanocomposites by employing MCM-41 silica as hard template (CoZnO-HT) and its catalytic behavior toward to CO 2 reforming with ethanol. The physicochemical features of the as-prepared catalysts were probed through various characterization techniques, including XRD, TEM, BET, H 2 -TPR, and XPS. Indeed, CoZnO-HT catalyst possessed a highly ordered mesostructure with similarity to MCM-41 template and a higher specific surface area (304 m 2 /g) compared to the reference CoZnO-C sample (4.75 m 2 /g) prepared by the conventional impregnation method. Consequently, CoZnO-HT exhibited good performance at low temperature, and full ethanol conversion could be achieved at 550 °C as well as the negligible formation of byproduct acetone. In addition, this catalyst depicted good stability and no obvious deactivation was observed after 40 h time on stream tests under the stoichiometric feed ratio. Indeed, superior specific surface area and efficient mass transport within the mesopores might be critical factors assigned to better activity and stability for CoZnO-HT.
研究领域:
催化化学
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材料科学
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能源化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Siying Du,Liuyun Chen,Chengzheng Men,Hongbing Ji,Tongming Su,Zuzeng Qin
Photocatalytic H 2 production using solar energy has received great attention, but suffers from low photocatalytic efficiency. Herein, Zn (1−x) Cd x S solid solution with different Zn/Cd molar ratio was synthesized by a solvothermal method, and tested for photocatalytic H 2 production from water. The bandgap, charge carrier separation efficiency and surface defect states of the Zn (1−x) Cd x S can be adjusted by altering the Zn/Cd molar ratio. The separation efficiency of photogenerated electrons and holes was greatly enhanced with the Zn/Cd molar ratio of 0.8:0.2. Moreover, the Zn 0.8 Cd 0.2 S exposed most surface defect states compared to those of other Zn (1−x) Cd x S, which can be act as electron pools and active sites for improving photocatalytic H 2 production. Therefore, when the molar ratio of Zn/Cd is 0.8:0.2, the Zn 0.8 Cd 0.2 S exhibited the best performance for photocatalytic H 2 production with the H 2 production rate of 7.71 mmol·g -1 ·h -1 , which is much higher than that of ZnS (17 μmol·g -1 ·h -1 ) and CdS (5.37 μmol·g -1 ·h -1 ). This work provides an in-depth understanding of the surface defect states for enhancing the photocatalytic H 2 production.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 13
·4412-4423
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IF 5.721
Qiang Liu,Zhenbo Zhao,Masahiko Arai,Chao Zhang,Ke Liu,Ruhui Shi,Peixuan Wu,Zhuangqing Wang,Weiwei Lin,Haiyang Cheng,Fengyu Zhao
The transformation of γ-valerolactone (GVL) into 1,4-pentanediol (1,4-PDO) and 2-methyltetra-hydrofuran (2-MTHF) in the presence of H2, one of the useful biomass conversion and utilization processes, was investigated with monometallic Cu/Al2O3 and bimetallic ZnCu/Al2O3 catalysts. A 10 wt% Cu-loaded monometallic catalyst produced 1,4-PDO and 2-MTHF in comparable quantities at a medium conversion (∼50%). When Zn was added in a range of Zn/Cu molar ratios of up to 2, in contrast, the catalysts yielded 1,4-PDO in a high selectivity of about 97% at low and high conversion levels. In addition, the 1,4-PDO selectivity over the ZnCu/Al2O3 catalysts remained almost unchanged during recycled runs. That is, the addition of Zn to Cu/Al2O3 switched the product selectivity and improved the catalyst stability and reusability. Furthermore, the physicochemical properties of the catalysts were characterized by several methods including XRD, TEM, TPR, XPS, FTIR of adsorbed pyridine, and so on. On the basis of those results, the relationships between the catalytic performance (activity, selectivity, and reusability) and the catalyst structural features were discussed.
研究领域:
催化化学
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生物质转化
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材料科学
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DOI
高影响因子
ADVANCED MATERIALS
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2025
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IF 26.8
Xinyi Lv,Yuqin Su,Hengyang Xiang,Linxiang Yang,Xinrui Chen,Yifei Wang,Kun Zhang,Jiahao Tang,Yuhui Ye,Bo Cai,Xueying Ma,Xiaoyong Wang,Haibo Zeng
Perovskite quantum dots (PQDs) are expected to be an ideal candidate for wide-color gamut displays owing to their high color purity. However, their color purity is challenged by remarkable spectral broadening due to non-uniform size distribution and crystal defects. Here, a ligand-ion (TOP-Zn) complex-modulating nucleation strategy is proposed to depress spectral broadening. This is achieved by enhancing the steric hindrance effect during lead-halogen octahedral assembly and reducing the reaction activity/sites of the system. This strategy is universal and has been confirmed to be effective for blue, green, and red PQDs, achieving narrowed spectral full-width-at-half-maximum (FWHM) of 15, 17, and 25 nm, respectively. These FWHMs are record-breaking and contribute to a wide color gamut coverage of ≈130% National Television Standards Committee and ≈100% Rec. 2020 standard. Meanwhile, these PQD-based light-emitting diodes (PeLEDs) exhibit a high external quantum efficiency (EQE) of exceeding 20% at their pure color range. These results provide a feasible path to achieve ultra-uniform and pure-color luminescent PQDs for wide-color gamut displays.
研究领域:
材料科学
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显示技术
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纳米科技
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 37
·17767-17775
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IF 3.925
Ji-Ping Jia,Yu-Lu Zhang,Jin-Yu Gou,Yi-Xuan Zhang,Yu-Ke Dai,Hong-Hua Ge,Yu-Zeng Zhao,Xin-Jing Meng
A Ti/SnO2–Sb–Cu–Zn electrode was prepared for the electrocatalytic oxidation of Acid Red 18 (AR18). The addition of Zn to the coating results in smaller surface cracks and greater roughness. When Cu and Zn coexist, high-index crystal planes are generated on smaller-sized grains formed on the coating surface, which allows the coating surface to adsorb oxygen. Sb5+ and the adjacent Cu2+–Zn2+ on the surface of the Cu–Zn co-doped coating are the advantageous active sites for adsorbed oxygen. The electrode exhibits a larger electrochemically active surface area and smaller electrochemical reaction resistance. The appearance of high-index crystal planes is beneficial to improve the electrocatalytic activity of the electrode, although the oxygen evolution potential of the electrode is not greatly improved. Cu–Zn co-doping produces synergistic mineralisation and enhances the ability to degrade AR18, and ˙OH is the main active species. During the thermal decomposition of the coating, Zn induces Cu to form more active sites on the high-index crystal planes of SnO2, a phenomenon that may be responsible for the synergistic production of more reactive oxygen species on the electrode surface.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
C.H. Yang,H.L. Pan,Y.K. Yang,H.T. Wu
A series of Zn-doped Li 2 (Mg 1-x Zn x ) 3 TiO 6 (x = 0, 0.05, 0.10, 0.15, 0.2) ceramics were formed via the conventional solid-state process. Influence of Zn 2+ on the crystal structures, phase compositions, sintering characteristics and properties of Li 2 (Mg 1-x Zn x ) 3 TiO 6 (0 ≤ x ≤ 0.2) ceramics were systematically studied. XRD results showed that a single phase with the cubic rock-salt structure was formed for Li 2 (Mg 1-x Zn x ) 3 TiO 6 (0 ≤ x ≤ 0.15) and the second phase of Zn 2 TiO 4 could be detected with a further increase of the Zn 2+ contents. Some intrinsic parameters were calculated in order to investigate the correlations between these parameters of Mg/Zn O bonds and microwave dielectric properties . As the Zn 2+ content increases, optimum ε r values exhibited an increasing trend, which could be explained by the variations of the polarizability and bond ionicity of Mg/Zn O bonds. The decrease of maximum Q·f values for Li 2 (Mg 1-x Zn x ) 3 TiO 6 (x = 0, 0.05, 0.10, 0.15, 0.2) ceramics could be predicted by the decrease of the packing fraction and lattice energy of Mg/Zn O bonds. τ ƒ values showed close relationship with the bond energy and thermal expansion coefficient of Mg/Zn O bonds. Excellent combined microwave dielectric properties with ε r = 15.46 (at 10.9 GHz), Q·f = 125,453 GHz (at 8.6 GHz) and τ f = −32.35 ppm/°C were obtained for Li 2 (Mg 0.85 Zn 0.15 ) 3 TiO 6 ceramic sintered at 1600 °C.
研究领域:
材料科学
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电子材料
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52041
·
IF 3.125
Zhiyuan Song,Jie Wang,Qian Tao,Yang Yu,Hui Zhang,Chuanqun Hu,Hongyu Cen,Xuan Zheng,Tao Hu,Chonggang Wu
Zn-salt poly(styrene– ran –cinnamic acid) (SCA–Zn) ionomers were successfully synthesized via the melt neutralization of poly(styrene– ran –cinnamic acid) (SCA), which has a comparable molecular weight ( = 217,000) to commercial polystyrene (PS), with different mass fractions of ZnO (0.62, 1.6, and 3.9 wt.%) and the successful synthesis was confirmed by Fourier transform infrared spectroscopy. The mechanical properties, heat resistance, and processibility of the PS, SCA, and SCA–Zn samples were characterized. Compared to SCA, the three SCA–Zn ionomers exhibited significantly higher α cN values, with the ionomers containing 1.6 and 3.9 wt.% ZnO were 11.4% and 68.6% higher than that of SCA, respectively. Compared to commercial PS, SCA–Zn also exhibited significant improvements in heat resistance (glass transition temperature and vicat softening temperature both improved by about 20 °C) and impact toughness ( α cN values of the ionomers containing 1.6 and 3.9 wt.% ZnO were 69.6% and 156.5% higher than that of PS), while the processability of SCA–Zn was not significantly worse than that of PS. This method efficiently improves both the toughness and heat resistance of PS, providing an efficient way to expand the market application of styrenic resins.
研究领域:
高分子材料
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材料科学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2014
·Vol. 4
·期 4
·1028-1037
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IF 4.76
Haiping Li,Quanhua Deng,Jingyi Liu,Wanguo Hou,Na Du,Renjie Zhang,Xutang Tao
Bi2MoO6/Zn–Al layered double hydroxide (LDH) hierarchical heterostructures assembled from Bi2MoO6 hierarchical hollow spheres and Zn–Al LDH nanosheets were synthesized by a low-temperature hydrothermal method. X-ray diffraction, Fourier transform-infrared spectroscopy, thermogravimetric analysis and X-ray photoelectron spectroscopy (XPS) confirmed the formation of the Bi2MoO6/Zn–Al LDH composites. Morphologies were characterized by scanning electron microscopy and transmission electron microscopy (TEM). XPS and high resolution TEM indicated the formation of a Bi2MoO6/Zn–Al LDH heterojunction. Increasing the LDH content from 0 to 27.0 wt.% caused the Brunauer–Emmett–Teller (BET) specific surface area of the composites to gradually increase. The photocatalytic degradation activity for Rhodamine B (RhB) under visible light irradiation exhibited a large enhancement, followed by a decrease, with increasing LDH content. The Bi2MoO6/Zn–Al LDH heterostructure composite with LDH content of 5.5 wt.% showed the highest photocatalytic activity and degraded 99% of RhB in 80 min, while Bi2MoO6 degraded less than 50%. The average photocatalytic efficiency is enhanced by more than 100%. The enhanced photocatalytic activity of the Bi2MoO6/Zn–Al LDH heterostructure photocatalyst was mainly attributed to the efficient separation of photoinduced electrons and holes. Superoxide radicals and holes were the major active species. The Bi2MoO6/Zn–Al LDH heterostructure photocatalyst exhibited excellent stability and reusability. A detailed mechanism for its enhanced photocatalytic activity was discussed in this study. This work provides an effective way to fabricate a series of Bi-based and LDH-containing heterostructure photocatalysts.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 15
·2114-2121
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IF 8.683
Xiangnan Wang,Zeyu Feng,Congyang Ye,Haofeng Zang,Yonghua Lu,Hongli Zhang,Gang Zou
Smart materials with programmable shape deformation and synergistic shape/fluorescence variation are highly desired in various practical applications, such as bio-inspired multifunctional robots and machines. However, it is still quite challenging to construct smart surfaces with dynamic fluorescence and morphology from MOFs, which potentially introduce superior performance. Herein, we proposed to utilize Zn-TCPP MOFs and polyurethane to construct a smart hybrid gel, which could exhibit synergistic dynamic fluorescence and reconfigurable patterns upon treating with pure water. Their reversible fluorescence variation as well as the swelling of the surface could be observed even directly by the naked eye. Based on the above results, we designed a dual-response rewriting pattern and flower-like artificial actuator with simultaneous fluorescence variation and shape deformation performance. This study would be of great fundamental value in the rational design of novel smart materials and surfaces.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 23
·9395-9408
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IF 4.5
Lin Yixuan,Qi Xiaoquan,Niu Guoqiang,Sun Qin,Ji Hongjun,Li Mingyu,Li Yufeng
Si 3 N 4 is a promising material for heat dissipation substrate due to its excellent thermal conductivity and mechanical properties. However, its application is limited by the difficulties in surface metallization. In this work, surface metallization of Si 3 N 4 ceramic substrate is realized by thick film method for the first time. Conductive silver paste containing Bi 2 O 3 -B 2 O 3 -ZnO glass frit as glass binder was prepared, and high-performance silver thick films were formed on Si 3 N 4 ceramic surface. The mechanical and electrical properties of silver films were significantly promoted with increasing sintering temperature, and silver films with high shear strength of 23.35 MPa and low resistivity of 3.41 μΩ·cm were obtained when sintered at 600 °C. In the meanwhile, the silver films exist high reliability under thermal cycles. The bonding between the silver thick film and Si 3 N 4 ceramic substrate was considerably enhanced as a result of interfacial reaction, forming Bi 2 Si 2 O 5 phase at the interface during sintering process. The formation mechanism was discussed and it is of great significance for the interfacial design in future studies. The results suggest that thick film method is a promising technology for obtaining high-quality surface metallization for Si 3 N 4 ceramic substrate. Graphical abstract
研究领域:
材料科学
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电子工程
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DOI
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 8
·1384-1392
·
IF 3.849
S. Ding,X. F. Yang,T. T. Deng,E. H. Song,Z. J. Ma,S. Ye,M. M. Wu,Q. Y. Zhang
Solid-solution phase K(Mn,Zn)F3 mesoporous microspheres have been successfully prepared via a simple one-pot hydrothermal method by using citrate ions as a chelating agent. Effects of the reaction time on the phase transformation and morphological evolution of the K(Mn,Zn)F3 microspheres have been carefully investigated. The results revealed that the hierarchical mesoporous spherical structures with a solid-solution phase were formed from a core–shell structure with mixed phases via the nanoscale Kirkendall effect. It is noted that Yb3+/Er3+-codoped K(Mn,Zn)F3 microspheres exhibit intense single-band red up-conversion emission with environmental responsivity upon excitation using a 980 nm laser diode, indicating a promising potential biomedical application for drug delivery.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Shuhuai Li,Yan Deng,Chaohai Pang,Xionghui Ma,Yuwei Wu,Mingyue Wang,Jianping Li,Zhi Xu,Lianming Zhang
The performance of an electrochemiluminescent reagent directly affects the performance of its corresponding electrochemiluminescent (ECL) sensor. In this study, Fe/Zn-benzene-1,3,5-tricarboxylic acid metal–organic framework@C-dots (Fe/Zn-BTC@C-dots), which consist of a nano-loaded carbon quantum dot material with an excellent luminescence performance, were synthesised for the first time. Subsequently, they were used to modify the surface of a glassy carbon electrode, and combined with a single-chain thiamethoxam DNA aptamer to construct a biosensor. A novel method for the detection of thiamethoxam was established based on control of the excellent luminescence signal of the Fe/Zn-BTC@C-dots by specific recognition of the aptamer by the target molecule (a signal switch). Upon capturing thiamethoxam, the electrochemical luminescence intensity of the sensor was quenched. The ability of Fe/Zn-BTC to effectively catalyse and amplify the electrochemical luminescence of the C-dots significantly improved the sensitivity of the sensor, while the specific recognition of the target by the aptamer imparted the sensor with an excellent selection ability. Such an advanced approach is promising for the detection of thiamethoxam, with a linear range of 5–5000 × 10 −11 mol/L and a sensitivity of 9.81 × 10 −12 mol/L being achieved. Moreover, the sensor exhibited recovery rates of 90.5–109.3% upon the detection of thiamethoxam in actual samples.
研究领域:
分析化学
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环境科学
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材料科学
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生物化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）