CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Xiaonan Duan,Jiabin Yin,Mengmeng Huang,Peixia Wang,Jisong Zhang
Halogenated aromatic anilines are series of crucial intermediates for the synthesis of pigments, medicines and pesticides in the fine chemistry. However, efficient inhibition of undesired dehalogenation is difficult to achieve in the commonly used batch reactors. Although employing continuous flow technology and modified catalysts could alleviate dehalogenation, obtaining high selectivity of halogenated aromatic anilines especially for brominated aromatic amines and iodine aromatic amines is still challenging. In this study, a continuous flow system based on micro-packed bed reactor was developed and a kinetic model of the hydrogenation of halogenated nitrobenzene was established. Kinetic parameters for the reductions of p -chloronitrobenzene, p -bromonitrobenzene and p -iodonitrobenzene were acquired and the kinetic model exhibited good fit for the transformation of each substance. Moreover, the accuracy of kinetic model was validated by the comparison with the values in literature. The obtained kinetic model offered helpful information for the process optimization of hydrogenation of halogenated nitroaromatics in continuous flow system.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
·
IF 4.464
Chengchao Wang,Ze Wang,Datong Wu,Wenrong Cai,Yong Qin,Yong Kong
We report on a hollow NiCoSe 2 /C prepared through a step-by-step derivatization method as high-performance supercapacitor electrode. Hollow nickel-cobalt bimetallic layered hydroxide (NiCo-LDH) derived from a typical zeolitic imidazolate framework (ZIF-67) was selenized to NiCoSe 2 via in situ selenylation, which was then coated with a layer of carbon via the hydrothermal method by using glucose as the carbon source. The electrochemical performances of the as-synthesized NiCoSe 2 /C are investigated, and the results indicate that the hollow NiCoSe 2 /C exhibits considerable specific capacity of 232.6 mAh g −1 at 1 A g −1 , good rate capability of 72.6% and high capacity retention of 88.3% after 5,000 cycles. Compared with ZIF-67, NiCo-LDH and NiCoSe 2 , the greatly enhanced electrochemical performances of the NiCoSe 2 /C can be due to the hollow nanostructure of NiCoSe 2 , enhanced electrical conductivity by the introduction of Se and C, and inhibited volume changes during the redox cycling from the protection of the carbon layer.
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RSC Advances
·
2023
·Vol. 13
·期 23
·15910-15917
·
IF 3.9
Zhanjun Zhang,Qipeng Liu,Dashu Pan,Yubing Xue,Xiaojuan Liu,Jing Zhao,Yinggen Ouyang,Xiaofan Ding,Songtao Xiao,Qingyuan Yang
In order to solve the problem that UO2 in direct ethanol fuel cell anode catalysts is easily lost in acidic solution, resulting in the degradation of catalytic performance, this paper prepared a C/UO2/PVP/Pt catalyst in three steps by adding polyvinylpyrrolidone (PVP). The test results by XRD, XPS, TEM and ICP-MS showed that PVP had a good encapsulation effect on UO2, and the actual loading rates of Pt and UO2 were similar to the theoretical values. When 10% PVP was added, the dispersion of Pt nanoparticles was significantly improved, which reduced the particle size of Pt nanoparticles and provided more ethanol electrocatalytic oxidation reaction sites. The test results by electrochemical workstation showed that the catalytic activity as well as the stability of the catalysts were optimized due to the addition of 10% PVP.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 35
·16531-16538
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IF 3.3
Yulong Zheng,Hui Zhang,Pei Han,Zhaoshun Zhang,Xueqin Zuo,Qun Yang,Huaibao Tang,Shaowei Jin,Guang Li
Solar distillation can directly produce clean water from non-potable water resources using solar energy and has great promise in desalination systems. However, the improvement of evaporation efficiency through the selection and optimization of suitable candidate materials is still a challenging problem. In this paper, by implementing a customized insulating floating layer and establishing an interfacial evaporation system, we have achieved a successful experiment demonstrating the potential to improve the efficacy of solar steam generation. This system is created by growing 1T-2H mixed-phase molybdenum disulfide composites on the carbonized ZIF8 surface. In this study, the treated composites were well integrated with the thermal insulating floating layer to achieve a stable interfacial structure for photothermal conversion. Furthermore, the cotton threads, known for their great absorbency, created an unhindered pathway for water flow, making it easier for steam to be generated and circulated. Using the above system, under one solar illumination condition, a significant evaporation rate of 1.57 kg m−2 h−1 was attained. The solar steam conversion efficiency of this interfacial heating system under one solar illumination condition was 94.4%. In addition to demonstrating that interface engineering is effective for solar steam production, this work offers a simple and economical water purification method.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Aming Xie,Ronghui Guo,Lipeng Wu,Wei Dong
Developing an effective strategy to regulate the interfacial properties of hierarchical structure is of great significance for preparation of high-performance electromagnetic wave absorption (EMA) materials. Ion-substitution can change intrinsic structure and properties of a materials, but its effect on the interfacial properties of hierarchical structure remained to be explored. Herein, we first constructed a C@MoS 2 hierarchical structure via simple hydrothermal reaction , then used the ion-substitution strategy to replace the S atoms in MoS 2 with O, F and Se, and finally obtained anion-substituted hierarchical structure (C@X-MoS 2 , X = O, F, Se). The results show that ion-substitution destroys the MoS 2 crystal structure and realizes tunable dielectric properties of C@MoS 2 , which leads to further enhancement of overall interfacial polarization. After optimization, the absorption strength and width of C@O-MoS 2 has been significantly improved. The minimum reflection loss (RL min ) reaches −62.17 dB, and the maximum effective absorption bandwidth (EAB max ) is 7.0 GHz. The simulation results show the obtained absorbent can greatly reduce the radar cross section of target, indicating it has broad application potential. Therefore, this work provides a novel method for regulation of EMA performance of hierarchical structure and preparation of high-performance absorbents.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Anan Xu,Jishun Li,Shenglan Zhang,Hongcheng Pan
Immunochromatographic test strips typically consist of sample pad, conjugate pad, nitrocellulose membrane, and absorbent pad. Even minute variations in the assembly of these components can lead to inconsistent sample-reagent interactions, thereby reducing reproducibility. In addition, the nitrocellulose membrane is susceptible to damage during assembly and handling. To address this issue, we propose to replace the sample pad, conjugate pad, and nitrocellulose membrane with hierarchical dendritic gold nanostructure (HD-nanoAu) films to develop a compact integrated immunochromatographic strip. The strip uses quantum dots as a background fluorescence signal and employs fluorescence quenching to detect C-reactive protein (CRP) in human serum. A 5.9 μm thick HD-nanoAu film was electrodeposited on an ITO conductive glass by the constant potential method. The wicking kinetics of the HD-nanoAu film was thoroughly investigated, and the results indicated that the film exhibited favorable wicking properties, with a wicking coefficient of 0.72 μm ms −0.5 . The immunochromatographic device was fabricated by etching three interconnected rings on HD-nanoAu/ITO to designate sample/conjugate (S/C), test (T), and control (C) regions. The S/C region was immobilized with mouse anti-human CRP antibody (Ab1) labeled with gold nanoparticles (AuNPs), while the T region was preloaded with polystyrene microspheres decorated with CdSe@ZnS quantum dots (QDs) as background fluorescent material, followed by mouse anti-human CRP antibody (Ab2). The C region was immobilized with goat anti-mouse IgG antibody. After the samples were added to the S/C region, the excellent wicking properties of the HD-nanoAu film facilitated the lateral flow of the CRP-containing sample toward the T and C regions after binding to AuNPs labeled with CRP Ab1. In the T region, CRP-AuNPs-Ab1 formed sandwich immunocomplexes with Ab2, and the fluorescence of QDs was quenched by AuNPs. The ratio of fluorescence intensity in the T region to that in the C region was used to quantify CRP. The T/C fluorescence intensity ratio was negatively correlated with the CRP concentration in the range of 26.67–853.33 ng mL −1 (corresponding to 300-fold diluted human serum), with a correlation coefficient ( R 2 ) of 0.98. The limit of detection was 15.0 ng mL −1 (corresponding to 300-fold diluted human serum), and the range of relative standard deviation: 4.48–5.31%, with a recovery rate of 98.22–108.33%. Common interfering substances did not cause significant interference, and the range of relative standard deviation: 1.96–5.51%. This device integrates multiple components of conventional immunochromatographic strips onto a single HD-nanoAu film, resulting in a more compact structure that improves the reproducibility and robustness of detection, making it promising for point-of-care testing applications.
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高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Yunfei Yao,Zhiying He,Xiangyang Xu,Yuanlin Tong,Dongsheng Chen,Chenyu Huang,Hongye Zhao
Following a flowsheet comprised of a hydrothermal reaction and a dehydration/carbonization, Si-xFe/O@C anodes featured with Fe-doping and carbon encapsulation were assembled. Comparing with pure Si, Si disseminated with in situ generated nano-scaled ferric oxide (Fe 2 O 3 ) particulates displays remarkably improved cyclic performance. Fe 2 O 3 may induce amorphization and optimize electrical conductivity, by enhancing the formation of Fe and Li 2 O amidst charging-discharging cycles. The as-derived Fe phase benefits the transport and storage of lithium-ion and electrons. Meanwhile, numerous tiny interfaces can be constructed between Fe granules and adjacent Li x Si or Li 2 O, and generate pseudocapacitance. After the carbonization of resorcinol-formaldehyde resin encapsulated on Si granules, core-shell structured Si- x Fe/O@C particulates can be assembled. Owing to the synergism of defect-rich structure, carbon layer well-wrapped thereon and interfacial pseudocapacitance, these nanocomposite anode materials exhibit long cyclic and upgraded rate performance. After 200 cycles, Si-0.42Fe/O@C anode retains a capacity of 929 mAh·g −1 at 1 A·g −1 and 735 mAh·g −1 at 2 A·g −1 . In the rate performance test operated at 5 A·g −1 , a high current density, 844 mAh·g −1 could be released. Si-0.42Fe/O@C can be charged with a specific capacity exceeding 250 mAh·g −1 over the potential range of 0.75-3 V at various current densities, demonstrating the contribution of nano-Fe pseudocapacitance effect to the energy storage of Si anodes.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wei Bi,Ling Zhang,Hao Jiang,Chunzhong Li,Yanjie Hu
The precise regulation of the nano-catalyst structure is a big challenge that limits the application of photocatalytic technology in CO 2 reduction. Herein, to improve the utilization of sunlight, the separation and transfer efficiency of photogenerated electron-hole pairs, and the surface catalytic reaction process, CuInS 2 /C/TiO 2 (CIS/C/T) hierarchical tandem heterostructure have been rationally designed. Multiple in-situ characterizations and DFT simulations show that CQDs not only act as a co-catalyst, but also act as a bridge between TiO 2 (T) and CuInS 2 (CIS), which further attribute to the efficient separation and enrichment of photogenerated electron-hole pairs while effectively avoiding the recombination. In consideration of the excellent broad-spectrum absorption, the CO 2 -to-CO photoreduction performance of the optimal CIS/C/T reaches up to 7.73 μmol g -1 h −1 , about 3.16 times enhancement of C/T. Combined with in-situ DRIFTs, the intrinsic structure–activity relationship is pointed out, and extended to other similar TiO 2 -based catalytic systems (In 2 S 3 /C/TiO 2 ). This work will provide a new universal strategy for the design and synthesis of high-performance nano-photocatalysts.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Ruge Zhao,Baoxia Ni,Luming Wu,Pingchuan Sun,Tiehong Chen
Efficient catalysts for hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR) are of paramount importance for electrochemical energy applications. Herein, a high-efficient carbon-based trifunctional electrocatalyst FeCoP/C is synthesized through a simple one-step supramolecular-assisted method, in which a supramolecular gel structure is formed by phosphoric acid and melamine to allow the efficient and homogeneous incorporation of highly active species. Experimentally, the as-obtained catalysts exhibit practical trifunctional activities in the ORR, OER, and HER. In alkaline electrolytes , requiring overpotentials of 95 and 282 mV to deliver a current density of 10 mA cm −2 for HER and OER, respectively, and presents the significantly increased alkalic ORR activity, with the half-wave potential of 0.849 V. Furthermore, the FeCoP/C also showed good integrated capabilities for Zn-air batteries. This supramolecular-assisted strategy could bring new inspiration to boost the electrocatalytic performance of transition metal-based electrocatalysts for energy conversion applications.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Hao Xiong,Anze Shui,Qingliang Shan,Shenghui Zeng,Xiuan Xi,Bin Du
Polishing porcelain stoneware tile residues (PPR) is used to prepare foamed ceramic to solve the problem of solid waste discharge in ceramic industry. In this study, C, Al and Si powder were added to the simulated PPR to control foaming, and the mechanism of silicon carbide foaming in the PPR was discussed in detail. After these powders were introduced into the simulated PPR, the phenomenon of alumina crystallization on the pore wall of the foamed ceramic and the diffusion of gas in the foamed ceramic were discovered to be exciting. The foaming mechanism of PPR is detailed as follows: the diffusion rate of oxygen in silicate liquid is faster than that of CO during sintering, so the CO generated by incomplete oxidation of silicon carbide in PPR accumulates in the liquid, which makes the volume of ceramics expand and causes foaming.
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高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Jing Zhong,Jian Gu,Kai-da Zhu,Xin-ru Wang,Sen-lin Wang
Adding lead-carbon composite materials to the negative plate of lead-acid batteries can effectively improve the electrochemical performance of the battery . In this paper, a novel quasi-solid method is used to in-situ synthesize the nano-Pb/C composite as additives in the negative active material of lead-acid cells, which can greatly increase the utilization rate of negative active material and the initial discharge capacity of the lead-acid cell. Compared with the N C material, the nano-Pb/C composite effectively inhibits the hydrogen evolution reaction . In addition, since the nano-Pb/C composite and the negative active material in the negative plate form a porous framework, the diffusion of the electrolyte and the dissolution of PbSO 4 are accelerated. The cell containing 1 wt.% nano-Pb/C composite has the best cycle performance (18,154 cycles) under high-rate partial-state-of-charge condition. All in all, the nano-Pb/C composite prepared via a new quasi-solid method has the advantages of improving the initial capacity and lifespan of lead-acid batteries, and it is a promising candidate material for lead-acid battery additives.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 33
·期 1
·235-243
·
IF 2.478
He Yawen,Ye Zhongbin,Chamas Mohamad,Sougrati Moulay Tahar,Lippens Pierre-Emmanuel
Porous Si/Cu 6 Sn 5 /C composite containing native oxides was prepared via solid-state mechanical milling and wet chemical etching. This composite was used as anode material for Li-ion batteries. X-ray diffraction, scanning electron microscopy, 119 Sn Mössbauer spectroscopy, and X-ray photoelectron spectroscopy show that the composite has a pitaya-like morphology based on porous Si and embedded Cu 6 Sn 5 non-porous microparticles with surface native oxides. Both Si and Cu 6 Sn 5 are electrochemically active, and the activation process during the first charge–discharge improves the nanostructuration of the composite that helps buffer the volume variations of the Li-Si and Li-Sn alloying reactions. The porous composite delivers a reversible and stable capacity of 900 mAh g −1 at a galvanostatic current density of 422 mA g −1 with a retention of 90% for 100 cycles, which is higher than porous Si (53%). The stability during cycling is explained by buffering effect, enhanced electrode conductivity, and stable SEI due to the presence of native oxides and the use of FEC-containing electrolyte.
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