JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Yuhan Cui,Chunyan Zhao,Lijie Zhao,Xiaohong Zhang,Jianxin Wang
As a new environment-friendly energy storage system between traditional capacitors and lithium-ion batteries, supercapacitors have many excellent characteristics compared with other energy storage devices. The new electrode material is the key component to determine the performance of the supercapacitor. Combined with the relevant literature reports of researchers in recent years, the structure and properties of Co, Zn, Ni and other materials were introduced, and the preparation method of Co–Zn as electrode material was sorted out. The rGO/Zn 0.773 Co 0.227 S composites were prepared by a simple template method to analyze the structure and morphology, and rGO/Zn 0.773 Co 0.227 S was treated to make it a paste adhering to nickel foam. Benefiting from the synergistic effect between Zn 0.773 Co 0.227 S and rGO , the composite provides significantly improved energy storage capability in a three-electrode system. The specific capacitance can reach 1680 F g −1 at the current density of 1 A g −1 . When the current density is increased to 10A g −1 , the specific capacitance still reaches 895.4 F g −1 , and the loss of the specific capacitance is only 22.2% after 5000 cycles at 10 A g −1 . When rGO/Zn 0.773 Co 0.227 S is used as cathode material and AC as negative material, asymmetric supercapacitor also has good cycle stability and high energy density .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Yuan Chen,Hao Guo,Fan Yang,Ning Wu,Junye Zhang,Liping Peng,Bingqing Liu,Zhilan Pan,Wu Yang
A metal porous carbon (Ni@NC) supported nickel/cobalt layered double hydroxide (NiCo-LDH) (Ni@NC@NiCo-LDH) with a cauliflower morphology was synthesized by a successive double template method . At first a nickel metal-organic framework (Ni-MOF) was prepared and used as a sacrifice template to produce metal porous carbon (Ni@NC). Then the prepared conductive porous carbon material was exploited as a substrate for in-situ growing of ZIF-67 on its surface. Lastly the obtained Ni@NC@ZIF-67 was further used as a sacrifice template to prepare the final electrode material Ni@NC@NiCo-LDH by Ni 2+ etching and co-precipitation. The cooperation of Ni@NC with excellent conductivity and NiCo-LDH with superior pseudocapacitive property yielded a synergistic effect , which effectively improved the electrochemical performance of the resulted electrode material. And the special flower morphology exposed more redox active sites and provided proper charge transport path for enhanced electrochemical performance. The prepared Ni@NC@NiCo-LDH exhibited a high specific capacitance of 1761.8 F·g −1 at the current density of 1 A·g −1 . The assembled Ni@NC@NiCo-LDH//AC asymmetric supercapacitor also displayed an acceptable energy density (39.27 Wh·kg −1 at the power density of 757.21 W·kg −1 ) and ultrahigh cycling stability (94.74% capacitance retention after 25000 cycles at 10 A g −1 ).
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JOURNAL OF FOOD SCIENCE
·
2021
·Vol. 86
·期 10
·4393-4404
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IF 3.167
Xin Wang,Zhijun Zhang,Huizhen Li,Tianyu Hou,Yana Zhao,He Li
Perilla seed oil (PSO) has a special aromatic odor, which is unpleasant to the personal preferences of some consumers. To this end, this article evaluated the differences in volatile organic compounds (VOCs), physicochemical characteristics, and fatty acid composition of PSO treated with ethanol (PSO-EA), activated carbon (PSO-AC), and activated kaolin (PSO-AK). The results showed that in the PSO, PSO-EA, PSO-AC, and PSO-AK samples, the content of linolenic acid, oleic acid, and linoleic acid hardly changed. Among the physicochemical characteristics of the four samples, the color difference between PSO and PSO-EA was greater than the color difference between PSO and PSO-AC, PSO-AK. The three treatment methods had the greatest impact on the PSO peroxide value but had little effect on other indicators. Gas chromatography–ion mobility spectrum results identified 28 known volatiles, of which aldehydes, alkenals, alcohols, ketones, and esters were the main groups. Fingerprint analysis found that PSO had an aromatic odor, which includes 1-hexanol, hexanal, and 2-pentylfuran; the removal effect of ethanol on VOCs in PSO was better than that of activated carbon and activated kaolin. The difference between the four oil samples was found from the strength of the VOCs’ signals in a two-dimensional map. From the principal components analysis and the “nearest neighbor” fingerprint analysis, it was found that PSO is generally quite different from PSO-EA, PSO-AC, and PSO-AK, while in the “nearest neighbor” fingerprint analysis, PSO-AC and PSO-AK are similar in general. In short, PSO will have better applications in the food field. Practical Application Treatment of PSO with ethanol, activated carbon, and activated kaolin is conducive to the comprehensive utilization of edible resources. In this work, ethanol, activated carbon, and activated kaolin were used to remove VOCs in PSO, and PSO-EA, PSO-AC, and PSO-AK were obtained. The perilla seed oil after these three treatment methods was tested for VOCs, physicochemical characteristics, and fatty acid composition. They can meet the needs of more consumers without affecting the fatty acid composition in the PSO, and have broad development prospects.
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PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 9
·2332
·
IF 5.076
Qiangqiang Feng,Yanyan Liu,Jitong Yan,Wei Feng,Shaozheng Ji,Yongfu Tang
A promising aqueous aluminum ion battery (AIB) was assembled using a novel layered K2Ti8O17anode against an activated carbon coated on a Ti mesh cathode in an AlCl3-based aqueous electrolyte. The intercalation/deintercalation mechanism endowed the layered K2Ti8O17as a promising anode for rechargeable aqueous AIBs. NaAc was introduced into the AlCl3aqueous electrolyte to enhance the cycling stability of the assembled aqueous AIB. The as-designed AIB displayed a high discharge voltage near 1.6 V, and a discharge capacity of up to 189.6 mAh g−1. The assembled AIB lit up a commercial light-emitting diode (LED) lasting more than one hour. Inductively coupled plasma–optical emission spectroscopy (ICP-OES), high-resolution transmission electron microscopy (HRTEM), and X-ray absorption near-edge spectroscopy (XANES) were employed to investigate the intercalation/deintercalation mechanism of Na+/Al3+ions in the aqueous AIB. The results indicated that the layered structure facilitated the intercalation/deintercalation of Na+/Al3+ions, thus providing a high-rate performance of the K2Ti8O17anode. The diffusion-controlled electrochemical characteristics and the reduction of Ti4+species during the discharge process illustrated the intercalation/deintercalation mechanism of the K2Ti8O17anode. This study provides not only insight into the charge–discharge mechanism of the K2Ti8O17anode but also a novel strategy to design rechargeable aqueous AIBs.Keywords:aluminum ion battery;K2Ti8O17anode;discharge–charge mechanism
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jie Liu,Dipan Xuan,Zhe Lu,Zhuang Wang,Qian Liu,Shuirong Li,Duo Wang,Yueyuan Ye,Dechao Wang,Zhifeng Zheng
Using carbon-based materials as substrates or additives is an effective strategy for the improvement of electrochemical properties of polypyrrole (PPy) in supercapacitors, while the interfacial interactions between them is not exactly clear, which limits the rational design of composite electrodes. Herein, the interfacial interactions are investigated by forming novel freestanding composite electrodes via depositing PPy on the surface of carbon foam (CF). After combination, the capacitance increases from 37.3 mF cm −2 to 364.0 mF cm −2 . Moreover, a superior capacitance retention (99.6%) can be achieved, after 10,000 charging/discharging cycles. Density functional theory (DFT) results show that the introduction of different oxygen-containing functional groups will lead to the difference of adsorption energy between carbon materials and PPy, thus affecting the cycling stability of composite materials. Moreover, the intermolecular interaction also affects redox properties of composite electrodes by changing the composition and energy of frontier orbits of the interfacial complexes involved in redox reactions. This study will provide a new perspective for purposeful regulating the electrochemical performance of composite electrodes.
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Journal of Bionic Engineering
·
2021
·Vol. 18
·期 5
·1147-1156
·
IF 2.682
Wang Peng,Wang Jian,Duan Wei,Li Chunyan,Han Huilong,Xie Qing
Unexpected ice accumulation tends to cause many problems or even disasters in our daily life. Based on the superior electrothermal and photothermal function of the carbon nanotubes, we introduced a superhydrophobic/electrothermal/photothermal synergistically anti-icing strategy. When a voltage of 15 V was applied to the superhydrophobic sample, the surface could rapidly melt the ice layer (~ 3 mm thickness) within 530 s at the environmental temperature of − 25 °C. When the near-infrared light (808 nm) irradiates on the superhydrophobic sample, the ice could be rapidly removed after 460 s. It was found that the superhydrophobicity helps the melted water to roll off immediately, and then solves the re-freeze problem the traditional surfaces facing. Moreover, the ice can be completely melted with 120 s when the superhydrophobic/electrothermal/photothermal synergistically anti-icing strategy was utilized. To improve the mechanical robustness for practical application, both nanoscale carbon nanotubes and microscale carbon powders were utilized to construct hierarchical structure. Then these dual-scale fillers were sprinkled onto the semi-cured elastomer substrate to prepare partially embedded structure. Both hierarchical structure and partially embedded structure were obtained after completely curing the substrate, which imparts excellent abrasion resistance (12.50 kPa, 16.00 m) to the prepared sample. Moreover, self-healable poly(urea–urethane) elastomer was introduced as the substrate. Thus, the cutted superhydrophobic sample can be mended by simply contacting at room temperature.
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Journal of Energy Storage
·
2022
·
IF 8.907
Tianfu Huang,Zehai Qiu,Zhibiao Hu,Zhusen Zhang
Transition metal oxides can serve as advanced electrode materials and have attracted extensive attention in the past decade. Herein, we have been successfully synthesized the FeCo 2 O 4 nanomaterials through a facile hydrothermal method followed by annealing treatment. The as-prepared FeCo 2 O 4 nanomaterials possessed a porous chopsticks-like microstructure, and the BET surface areas reached 85.32 m 2 g −1 . When the porous chopsticks-like FeCo 2 O 4 were used to make the working electrode, the three-electrode test system showed the ultrahigh specific capacitance of 679.94 F g −1 at current density of 1 A g −1 and a remarkable cycling stability with 93.68% capacitance retention being stable after 4000 cycles. Furthermore, the assembled porous chopsticks-like FeCo 2 O 4 // AC-ASC cell device exhibited a high energy density of 50.85 Wh kg −1 at a power density of 799.98 W kg −1 and still maintained 38.79 Wh kg −1 at a higher power density of 12,799.63 W kg −1 , and long cyclic stability, with almost 78.46% capacity retention after 5600 cycles. These results firmly verify that the porous chopsticks-like FeCo 2 O 4 nanomaterials have great potential application for supercapacitors.
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高影响因子
BIOMASS & BIOENERGY
·
2022
·
IF 5.774
Guojun Hao,Hongying Liu,Zhibing Chang,Kechen Song,Xin Yang,Han Ma,Wenjing Wang
In this work, lignin depolymerization was examined over CoMo sulfide catalysts supported on different carriers in supercritical ethanol system. The temperature, time, MoS 2 and carrier effects on the lignin depolymerization were investigated. 95.76% liquefaction yield with negligible char was achieved over Co–Mo–S/ZrO 2 at 340 °C for 150 min. The liquid product was mainly composed of C 4 –C 8 alcohols, C 4 –C 10 esters and C 7 –C 10 aromatic compounds . The synergistic effect of active sites and acid-base sites on support played an important role in lignin depolymerization. Furthermore, the Co–Mo–S/ZrO 2 catalyst is reusable with 8% loss in liquefaction yield after 5 cyclic runs. We believe that acid/base carriers or additives that can promote the medium to generate abundant free radicals or ions to replace external hydrogen pressure are one of the prospects for the design of depolymerization lignin catalysts.
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Pharmaceutics
·
2021
·Vol. 13
·期 11
·1809
·
IF 6.321
Yanyan Wu,Guang Yang,Henny C. van der Mei,Linqi Shi,Henk J. Busscher,Yijin Ren
Orally administrated probiotic bacteria can aid antibiotic treatment of intestinal infections, but their arrival at their intestinal target site is hampered by killing in the gastrointestinal tract and by antibiotics solely intended for pathogen killing. Carbon-quantum-dots are extremely small nanoparticles and can be derived from different sources, including bacteria. Here, we hypothesize that carbon-quantum-dots inherit antibacterial activity from probiotic source bacteria to fulfill a similar role as live probiotics in intestinal infection therapy. Physico-chemical analyses indicated that carbon-quantum-dots, hydrothermally derived fromBifidobacterium breve(B-C-dots), inherited proteins and polysaccharides from their source-bacteria. B-C-dots disrupted biofilm matrices ofEscherichia coliandSalmonella typhimuriumbiofilms through extensive reactive-oxygen-species (ROS)-generation, causing a decrease in volumetric bacterial-density in biofilms. Decreased bacterial densities leave more open space in biofilms and have enhanced ciprofloxacin penetration and killing potential in anE. colibiofilm pre-exposed to probiotic B-C-dots. Pathogenic carbon-quantum-dots hydrothermally derived fromE. coli(E-C-dots) did not disrupt pathogenic biofilms nor enhanceE. colikilling potential by ciprofloxacin. B-C-dots were biosafe in mice upon daily administration, while E-C-dots demonstrated a decrease in white blood cell and platelet counts and an increase in C-reactive protein levels. Therefore, the way is paved for employing probiotic carbon-quantum-dots instead of viable, probiotic bacteria for synergistic use with existing antibiotics in treating intestinal infections.Keywords:matrix disruption;antibiotics;Bifidobacterium breve;Escherichia coli;reactive oxygen species;intestinal infections;biosafety
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Senran Hao,Xiao Chen,Hao Wu,Xiaoyuan Zeng,Peng Dong,Lina Han,Fangyong Yu,Weizi Cai,Yongmin Xie,Jie Xiao,Yingjie Zhang
A direct carbon solid oxide fuel cell is a new technology for clean and efficient utilization of carbon resources to generate electricity, with the advantages of high power generation efficiency and wide available fuel flexibility. Biomass, in virtue of large specific surface area, numerous oxygen-containing functional groups which can promote the electrooxidation of carbon, and low ash content which can increase the cell stability, reveals promising feasibility as a fuel for direct carbon fuel cells. Here we report a high-performance direct carbon fuel cell utilizing Chinese parasol leaf biochar as fuel, among which Ag–Gd 0.1 Ce 0.9 O 2-δ and Al 2 O 3 doped yttria-stabilized zirconia are employed as symmetrical electrodes and electrolyte materials, respectively. The cell with pure leaf biochar fuel gives a maximum power density of 249 mW cm −2 and an open circuit voltage (OCV) of 1.008 V at 850 °C while an improved performance of 272 mW cm −2 and OCV of 1.01 V are achieved for the cell fuelled by Fe catalyst-loaded leaf biochar. The above results demonstrate that Chinese parasol leaf biochar can be applied as a potential fuel for high performance direct carbon solid oxide fuel cells.
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Polymers
·
2021
·Vol. 13
·期 19
·3300
·
IF 4.329
Shuang Chen,Shukun Wang,Xin Xue,Jinsheng Zhao,Hongmei Du
As a class of redox active materials with some preferable properties, including rigid structure, insoluble characters, and large amounts of nitrogen atoms, covalent triazine frameworks (CTFs) have been frequently adopted as electrode materials in Lithium-ion batteries (LIBs). Herein, a triazine-based covalent organic framework employing 3,4-ethylenedioxythiophene (EDOT) as the bridging unit is synthesized by the presence of carbon powder through Stille coupling reaction. The carbon powder was added in an in-situ manner to overcome the low intrinsic conductivity of the polymer, which led to the formation of the polymer@C composite (PTT-O@C, PTT-O is a type of CTFs). The composite material is then employed in LIBs as anode material. The designed polymer shows a narrow band gap of 1.84 eV, proving the effectiveness of the nitrogen-enriched triazine unit in reducing the band gap of the resultant polymers. The CV results showed that the redox potential of the composite (vs. Li/Li+) is around 1.0 V, which makes it suitable to be used as the anode material in lithium-ion batteries. The composite material could exhibit the stable specific capacity of 645 mAh/g at 100 mA/g and 435 mAh/g at 500 mA/g, respectively, much higher than the pure carbon materials, indicating the good reversibility of the material. This work provides some additional information on electrochemical performance of the triazine and EDOT based CTFs, which is helpful for developing a deep understanding of the structure–performance correlations of the CTFs as anode materials.Keywords:lithium-ion battery;D-A type polymer;triazine;3,4-ethylenedioxythiophene
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 4
·51549
·
IF 3.125
Zhongwen Wang,Yamin Deng,Xin Jia
Poly- p -phenyleneterephthalamide (PPTA) is widely used in national defense, military industry, and aerospace. However, with weak compression resistance and twist resistance, development of PPTA is greatly impeded. In this work, a novel rigid rod polymer was synthesized by polycondensation of 2,6-dihydroxyterephthalic acid with 2,3,5,6-tetraminopyridine which have a large quantity of hydrogen bonds between these polymer chains which provide excellent thermal properties named poly [N-(2,5-diamino-6-[imino]-3-pyridyl)-4-formyl-2,6-dihydroxybenzamide] (PPDA). The structure of the polymers was characterized by X-ray diffraction and Fourier transform infrared spectroscopy. The resulting showed that PPDA has good thermal stability and crystallinity, the maximum thermal decomposition temperature close to 900°C under the nitrogen atmosphere. At the same time, PPDA was insoluble in most organic solvents and exhibited good chemical stability. This indicated a superior performance over that of the poly(2,6-diimidazo(4,5-b:4′5′-e)pyridinylene-1,4(2,5-dihydroxy)phenylene). In addition, we can foresee that PPDA will play an important role in prospective surgery and aramid areas.
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危险品化学品经营许可证（带存储）