MATERIALS SCIENCE FORUM
·
2015
·
IF 0
Xiao Peng Xu,Si Chen,Yan Qin Shi,Bo Zhen Wu,Meng Ma,Xu Wang
The effect of orotic acid (OA) and its mixtures with calcium stearate (CaSt2) and zinc stearate (ZnSt2) in various ratios on the thermal stability of PVC has been investigated by Congo red and discoloration tests. The results shows that OA acts as a long-term thermal stabilizer for PVC like CaSt2, and the combination of OA and ZnSt2 exhibited a synergistic stabilization effect at a certain ratio. This is due to the ability of OA to absorb HCl released during the degradation of PVC to diminish its catalytic effects, and react with ZnCl2 to stop its catalytic effect for PVC. CaSt2-ZnSt2/OA stabilizers exhibit good synergistic effects with both acceptable initial color and long-term stability for PVC
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DOI
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Qiuchun Dong,Qian Wang,Ziyang Dai,Huajun Qiu,Xiaochen Dong
Developing highly active electrocatalysts with low cost and high efficiency for oxygen evolution reactions (OER) is important for the practical implementations of hydrogen energy. Here, we report a Zn-doped CoSe2 nanosheets grown on free-standing carbon fabric collector (CFC), which was synthesized by using a metal–organic framework (MOF) as precursor and followed by a selenylation process. Importantly, the Zn-doped CoSe2/CFC electrode exhibited an obviously enhanced catalytic activity for OER in 1 M KOH aqueous solution compared with CoSe2/CFC, showing a small overpotential of 356 mV for a current density of 10 mA cm–2, a small Tafel slope of 88 mV dec–1, and an excellent stability. The robust and free-standing electrode shows great potential as an economic catalyst for OER applications.
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DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Xiaoping Wu,Qiao Zhang,Lungang Chen,Qiying Liu,Xinghua Zhang,Qi Zhang,Longlong Ma,Chenguang Wang
The development of thermally stable Pt-based catalysts with superior performance for propane dehydrogenation reactions remains a daunting challenge. In this study, a series of PtSn-Mg(Zn)AlO catalysts with different Zn and Pt contents were synthesized by the anion-exchange method for the propane dehydrogenation reaction. To investigate the influence of Zn on the reaction performance and the catalyst structure, the prepared catalysts were characterized with several analytical techniques, including XRD , TEM, HRTEM, H 2 -TPD and CO pulse chemisorption . A good propane conversion (initially higher than 55% and averaging 45.2% over a period of 2 h) and propene selectivity (higher than 99%) were obtained experimentally with PtSn-Mg(3Zn)AlO at 550 °C. The results demonstrated that Pt provided the active sites and that Zn was a promoter. The HRTEM and CO pulse chemisorption results indicated that the addition of Zn to the PtSn-MgAlO catalyst can stabilize the dispersion of metal particles and thus inhibit the sintering of Pt particles. Furthermore, the activities of the used catalysts were almost recovered through reaction-regeneration cycles with the burning-off of coke during five cycles.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 33
·15919-15929
·
IF 3.553
Chen Yanping,Li Xiuting,Li Yaogang,Zhang Qinghong,Hou Chengyi,Wang Gang,Wang Hongzhi
The development of flexible dielectric polymers with robust temperature durability, excellent mechanical properties and high transparency will be of great significance for the soft electronics. In current work, a highly fluorinated polyimide (hF-PI) material was successfully synthesized. By using (3-Aminopropyl) triethoxysilane as “bridge” and controlling the humidity rigidly, transparent polyimide films with smooth surface and tight adhesion to a strong substrate was prepared. As well, the mechanism of non-transparent hF-PI film formation in an ambient atmosphere at a low concentration was clarified. Based on the high temperature resistance of the hF-PI, the indium–zinc oxide (IZO) semiconductor film was successfully prepared on hF-PI film by the simple eco-friendly aqueous route. The IZO thin-film transistor using hF-PI film as insulating layer exhibited highly transparent and excellent electrical performance in the carrier mobility and the on/off current ratio. In addition, the operating voltage was greatly reduced by physically doping with carbon nanotube, while the devices still maintained good transparency.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2021
·Vol. 22
·期 16
·8668
·
IF 5.924
Jie Li,Shiyi Wang,Huayin Li,Yuan Tan,Yunjie Ding
The synthesis of ester compounds is one of the most important chemical processes. In this work, Zn-Mg-Al mixed oxides with different Zn2+/Mg2+molar ratios were prepared via co-precipitation method and supported gold nanoclusters to study the direct oxidative esterification of aldehyde and alcohol in the presence of molecular oxygen. Various characterization techniques such as N2-physical adsorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and CO2temperature programmed desorption (TPD) were utilized to analyze the structural and electronic properties. Based on the results, the presence of small amounts of Zn2+ions (~5 wt.%) provoked a remarkable modification of the binary Mg-Al system, which enhanced the interaction between gold with the support and reduced the particle size of gold. For oxidative esterification reaction, the Au25/Zn0.05MgAl-400 catalyst showed the best performance, with the highest turnover frequency (TOF) of 1933 h−1. The active center was believed to be located at the interface between metallic gold with the support, where basic sites contribute a lot to transformation of the substrate.Keywords:gold catalyst;cluster;hydrotalcite;oxidative esterification;methyl isobutyrate
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jiaqi Huang,Xiaowei Chi,Jianhua Yang,Yu Liu
This work proposes a dual-cross-linked gel solid electrolyte (SE), here defined as Zn-re-inforced sodium alginate–polyacrylamide SE (Zn-reinforced SA–PAM SE), in which Na+ and Zn2+ coexist. The SE shows a high conductivity of 19.74 mS cm–1. Compared to the pure PAM gel, the tensile strength and compressive strength of Zn-reinforced SA–PAM SE are significantly enhanced to be 674.28 kPa and 16.29 MPa, respectively, because of the strengthening mechanism of Zn2+ cross-linked SA. Based on such a robust electrolyte, a novel hybrid cell is developed by involving Na0.5FeFe(CN)6–carbon nanotube composites (PB@CNT) as the Na+ intercalation-type cathode and metallic Zn as the plating anode. The hybrid cell shows an extremely high stability for 10,000 cycles with a record little capacity loss of 0.0027% per cycle, as Zn-reinforced SA–PAM SE successfully inhibits free water molecules from occupying low-spinning metallic sites (Fe–C) in Na0.5FeFe(CN)6. Ex situ X-ray photoelectron spectroscopy reveals that the dissolution of Na0.5FeFe(CN)6 is highly reduced by 79.5%. It is further noted that the corrosion and dendrites at the Zn2+/Zn plating anode are greatly hindered for the robust electrolyte. This work gives a pathway for the development of new aqueous ion batteries.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaosha Cui,Yaxiong Zhang,Situo Cheng,Yupeng Liu,Zhipeng Shao,Zhenheng Sun,Yin Wu,Hongzhou Guo,Jiecai Fu,Erqing Xie
The mild electrolyte working environment of rechargeable aqueous Zn-ion batteries (AZIBs) features its promising characteristic and potential application for large-scale energy storage system. However, the poor cycling stability significantly hinders the broad application of AZIBs due to the complex electrochemical conversion reactions during charge-discharge process. Herein, we propose a strategy to improve the electrochemical performance of AZIB by enhancing the successive electrochemical conversion reactions. With a rational design of electrode, an even homogeneous electric field can be achieved in the cathode side, resulting to significantly enhanced efficiency of successive electrochemical conversion reactions. Charge storage mechanism studies reveal that the reversibility behaviors of byproducts alkaline zinc sulfate (ZHS) can dramatically determine the H + /Zn 2+ de/intercalation process, and a high reversibility characteristic ensures the facilitated electrochemical kinetics. As expected, the resultant AZIB possesses outstanding electrochemical performance with a high specific capacity of 425.08 mAh⋅g −1 at 0.1 A⋅g −1 , an excellent rate capacity of about 60% (246.6 mAh⋅g −1 at 1 A⋅g −1 ) and superior cycling stability of 93.7% after 3000 cycles (at 3 A⋅g −1 ). This effective strategy and thinking proposed here may open a new avenue for the development of high-performing AZIBs.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Haibo Ye,Zhiyong Liu,Xingyue Liu,Bo Sun,Xianhua Tan,Yuxue Tu,Tielin Shi,Zirong Tang,Guanglan Liao
Organic-inorganic lead halide perovskite solar cells have garnered enormous interest in scientific communities due to comparable power conversion efficiencies and solution-processed fabrication techniques. Among them, carbon-based perovskite solar cells seem to be one of the most promising candidates for addressing the stability issue while suffering from inferior efficiency or high processing temperature. Herein, we introduce low-temperature processed Zn-doped SnO 2 (below 200 °C) as an effective electron transport layer in perovskite solar cells for the first time, and demonstrate a low-temperature carbon-based device with Cu-phthalocyanine as hole transport layer. We find that Zn doping contributes to a more suitable energy level alignment and an improved conductivity for SnO 2 films. As a result, the electron transfer and extraction are enhanced and the charge recombination is suppressed. In addition, devices with Zn-doped SnO 2 have a wider depletion region, leading to an enhanced photovoltaic performance . An optimal efficiency of 17.78% can be obtained after 2 mM Zn doping. Furthermore, these devices, introducing highly stable and hydrophobic Cu-phthalocyanine and carbon, maintain almost 100% of their initial efficiencies over 1200 h in ambient air. Our study paves the way for developing highly efficient and flexible carbon-based perovskite solar cells.
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 3
·1180-1188
·
IF 2.047
Ji Xinran,Zhou Ke,Zhao Ye,Sun Meiling,Dong Shijun,Zhang Hongbo,Cao Hechun,Zheng Hui,Wu Qiong,Zhang Yang
The regulation of magnetic and dielectric properties for yttrium iron garnet ferrites by ion doping is highly desirable in microwave devices. In this work, yttrium iron garnet ferrites co-doped with Pr-Zn-Zr atoms with the chemical formula Pr x Y 3-x Zn 0.1 Zr 0.1 Fe 4.8 O 12 (x = 0, 0.1, 0.15, and 0.2) were prepared. The dependence of the crystal structure, microstructure, magnetic, and dielectric properties of the obtained samples on the Pr doping concentration was investigated. The morphologies and crystal structure characterizations confirm that the Pr ion has effectively doped in the yttrium iron garnet ferrites and increased the lattice parameter and grain size. The magnetic characterization shows that the saturation magnetization also increases with the Pr concentration and obtains a maximum value of 27.68 emu/g at x = 0.15. Additionally, the doping of Pr increases the magnetic anisotropy constant K 1 which increases ferromagnetic resonance linewidth. Lastly, the dielectric properties measurement further indicates that Pr doping improves both real and imaginary parts of permittivity, and the highest value of the real part of the permittivity is obtained at x = 0.15. Consequently, the crystal structure, microstructure, magnetic properties, and dielectric properties of garnet ferrite can be effectively regulated by the Pr doping concentration, and excellent properties of the ceramic can be obtained at x = 0.15, which allows potential applications in microwave devices.
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DOI
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2022
·Vol. 156
·期 1
·
IF 4.304
Lei Xueyan,Fu Zhengping,Xiang Bin,Lu Yalin
The low stability and poor activities of transition metal selenides (TMSs) in alkaline electrolyte limit their application in supercapacitors. Metal doping and hybridization of various electroactive materials with different properties are utilized to enhance the electrochemical performance of TMSs by optimizing their electronic structure and providing rich electrochemical active sites. Herein, we report a simple two-step hydrothermal method for the growth of Zn-doped NiSe 2 and Ni(OH) 2 nanocomposites on Ni foam [Zn–NiSe 2 /Ni(OH) 2 ]. The resulting material delivers high specific capacity (1525.8 C g −1 /564.7 mA h g −1 at 6 A g −1 and 1220 C g −1 at 10 A g −1 ) in a three-electrode system. A Zn–NiSe 2 /Ni(OH) 2 //porous carbon (PC) aqueous asymmetric supercapacitor (ASC) was built by utilizing Zn–NiSe 2 /Ni(OH) 2 as the positive electrode and PC as the negative electrode. This Zn–NiSe 2 /Ni(OH) 2 //PC ASC shows an energy density of 75.8 W h kg −1 at a power density of 916.1 W kg −1 and achieves a specific capacity retention of 100% after 25 000 cycles at 10 A g −1 . These results reveal that the Zn doping and the hybridization of NiSe 2 with Ni(OH) 2 can obtain impressive electrochemical properties in ASCs.
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DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Jianghua Zhang,Ke Cheng,Hongyan Li,Fawen Yin,Qiaoe Wang,Li Cui,Shasha Yang,Jinggang Nie,Dayong Zhou,Beiwei Zhu
Catalytic production of structured phospholipids (SPLs) containing short-chain fatty acids (SCFAs) in an efficient heterogeneous manner is of great importance from the standpoint of food engineering. Herein, a bifunctionalized sulfonated Zn-SBA-15 catalyst was studied for SPL synthesis through interesterification of soybean lecithin with ethyl propionate or methyl butyrate. Various characterization techniques such as pyridine Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible diffuse reflectance spectroscopy were conducted to determine the physicochemical properties, so as to build the possible structure–reactivity relationship of the catalyst. In screening tests with commercial Amberlyst-15 or other SBA-15-type materials, the as-prepared sample showed promising catalytic performance probably owing to its mesoporous structure and cooperative role of Brönsted and Lewis acid sites. Notably, the sample was easily separated and recycled without obvious deactivation. In general, the investigated catalyst was regarded as one of the promising alternatives to otherwise expensive biocatalysts for SCFA-containing SPL production.
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DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2025
·
IF 3
Md Mostafezur Rahman,Shuai-Wen Ding,Mohanraj Kumar,Wei Zhang,Jih-Hsing Chang
Magnetic nanoparticles (MNPs) with temperature-dependent heating behavior offer a promising strategy for self-regulated magnetic induction hyperthermia (MIH) in cancer treatment. This study simulates the temperature-dependent heating performance of Al-doped Zn Mn ferrite nanoparticles (Zn 0.5 Mn 0.5 Al x Fe 2-x O 4 ) in a human liver tumor model, using experimentally validated parameters from previous characterization. The model evaluates in-tumor heating under physiological conditions, focusing on temperature rise, spatial uniformity, and thermal stability. The results confirm that MNPs with lower Curie temperatures (T C ) offer better temperature control, while higher-T C particles enable more efficient heating at reduced concentrations. Experimental validation using magnetic hydrogel phantoms demonstrated good agreement with simulation predictions, with temperature deviations within ±1.5 °C. These findings highlight the importance of incorporating temperature-dependent specific loss power (SLP) behavior for accurate modeling of hyperthermia outcomes and provide a practical framework for optimizing MNP selection and dosage for safe and effective treatment.
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