Materials Chemistry Frontiers
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2017
·Vol. 1
·期 12
·2656-2663
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IF 0
Chen Wu,Yuehua Wei,Qingwang Lian,Chao Cui,Weifeng Wei,Libao Chen,Chengchao Li
Enhancing the conductivity of electrode materials is critically important for improving the high-rate performance of Na-ion batteries (NIBs). Herein, we report a multifaceted strategy for optimizing the conductivity and electrochemical properties of nickel cobalt selenides via the combination of fine component regulation and C coating. The electrical conductivity of C@Ni0.33Co0.67Se2/C nanofiber (CNF) (Co0.67) hybrids achieved in this study was 0.3733 S mm−1, a conductivity five-fold higher than that of selenides with a Ni/Co ratio of 2 : 1. Coupled with desirable three-dimensional (3D) nanobrush morphology and the 1D conducting path of CNFs, the Co0.67 electrode achieved a superior rate performance of 413.1 mA h g−1, even at 2 A g−1. Furthermore, the Co0.67 electrode exhibited an impressive cycling performance of 499 mA h g−1 after 100 cycles (exhibiting an 89.5% capacity retention of the second cycle). Finally, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry analysis at different sweep rates were conducted to demonstrate the Co0.67 electrode's fast charge/ion transport ability and increased electrode kinetics.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaoxiao Zhou,Xiaoyan Peng,Haoyu Xu,Yijin Hao,Hezhang Li,Bo-ping Zhang
BiFeO 3 -BaTiO 3 (BF-BT) ceramics are an excellent choice for high-temperature lead-free piezoelectric ceramic due to their high Curie temperature and good piezoelectric properties , but the volatilization of Bi leads to the formation of A-site cationic vacancies and oxygen vacancies , culminating in heightened leakage currents and detrimental effects on piezoelectric properties. In this study, a chemical composition of 0.70Bi (1+ x ) Fe 0·97 Al 0·03 O 3 -0.30BaTiO 3 ceramics, abbreviated as B 1+ x FA-BT, where 0 ≤ x ≤ 0.05, were synthesized, with special attention on the effects of Bi compensation and poling process on their insulation and piezoelectric properties. Due to the coexistence of R - PC phases and low leakage current, B 1+ x FA-BT ceramics exhibit excellent piezoelectric properties and high Curie temperature, among which the B 1.02 FA-BT ceramic boasts optimal overall properties: d 33 = 196 pC N −1 , T C = 480 °C, k p = 34%, θ max = 49.5° and Q m = 32, under optimal poling parameters E p = 50 kV cm −1 and T p = 100 °C. The poling process is directly linked to the reorientation of domains, the redistribution of positive/negative space charge and the aggregation or injection of holes, which is achieved by tuning the poling field and temperature in a ceramic with optimal integrated piezoelectric properties. The poling process of BF-BT ceramics is significantly influenced by their leakage characteristics, which can have a significant impact on their overall performance. Optimizing electrical poling conditions and minimizing leakage current is crucial to achieving favorable piezoelectric properties in BF-BT ceramics with R - PC coexisting structures.
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Materials
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2016
·Vol. 9
·期 9
·779
·
IF 2.728
Yingfei Hou,Lingqian Kong,Xiuping Ju,Xiaoli Liu,Jinsheng Zhao,Qingshan Niu
Two novel triphenylamine-based thiophene derivative monomers, 4-cyano-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine and 4-methoxy-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine, were successfully synthesized. The corresponding polymers including poly (4-cyano-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine) and poly (4-methoxy-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine) were electrochemically synthesized and characterized by multiple test method. The electrochemical measurements and spectroelectrochemical analyses revealed that both of the two polymers had quasi-reversible redox behavior and multi-electrochromic properties. The two polymer films showed reversible electrochemical oxidation, excellent optical contrasts in NIR region (62% at 1070 nm for the first polymer, and 86% at 1255 nm for the second polymer), satisfactory coloration efficiencies and fast switching times. The research on the application of the as prepared polymer in the fabrication of electrochromic device was also conducted, employing PCMTPA or PMMTPA as the anodically coloring materials.Keywords:4-cyanotriphenylamine;4-methoxytriphenylamine;bithiophenes derivatives;electrochromism;spectroelectrochemistry;electrochromic devices
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Bo Wang,Wenhui Feng,Lulu Zhang,Yan Zhang,Xueyan Huang,Zhibin Fang,Ping Liu
A novel Bi/CdS nanocomposite is obtained via an in-situ chemical reduction method under mild conditions. The incorporation of Bi nanostructure can significantly enhance the photocatalytic performance for methyl orange (MO) and salicylic acid (SA) degradation compared with pristine CdS under visible light irradiation. The dramatically improved photoactivity can be attributed to the enhanced light absorption and optimized charge separation. In addition, the photocatalysis mechanism upon Bi/CdS for MO degradation is also investigated. This study is hoped to provide a new inspiration for the construction of high-efficiency semimetal/semiconductor photocatalysts, especially for non-noble metal/M x S y nanocomposites.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
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2014
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IF 1.716
Xijia He,Xuhui Xu,Youming Shi,Jianbei Qiu
The Ag ions were introduced into the Bi doped silicogermanate glasses by Ag + for Na + ion exchange method. After ion exchange, the X-ray photoelectron spectroscopy (XPS) spectrum implied the Ag ions were mainly in ionic form (Ag + ) within the glasses. With the increase of the Ag + concentration, more relaxation of local structure would be induced at the non-bridging oxygen (NBO), meaning that the network gave more negative sites. Bi 3+ ions could be reduced to lower valence states of Bi containing Bi near infrared (NIR) active centers with the depolymerization of glass network, resulting in the enhancement of the Bi NIR luminescence. After heat treatment, the XPS, absorption spectra and transmission electron microscope (TEM) images revealed Ag nanoparticles (Ag NPs) formed in glasses. With the increase of the Ag NPs concentration, more NBOs released from Ag + , which led to reduce more Bi 3+ ions to lower valence states of Bi containing Bi NIR active centers, resulting in further enhancement of the NIR luminescence. Our research may extend the understanding of structural modulation in Bi valence states and offer a valuable way to enhance the NIR luminescence of Bi in glasses.
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RSC Advances
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2014
·Vol. 4
·期 19
·9693-9700
·
IF 3.708
Jian Zou,Yun-Gui Peng,Yi-You Tang
Monodisperse Fe3O4@SiO2 nanoparticles are prepared using hydrazine as a catalyst via a biphase approach without any alcohols or surfactants. Fe3O4 seeds can be dispersed well in this system. The sizes of Fe3O4@SiO2 nanoparticles with a single core could be regulated from 20 nm to 50 nm corresponding to SiO2 shell thickness from 3 nm to 17 nm. Core-free SiO2 nanoparticles are not observed in this system. The coating process can be implemented at a temperature greater than 90 °C, which results in a short coating duration from 2 h to 8 h for different shell thicknesses. Hydrazine can prevent the Fe3O4 core from oxidization during coating at this temperature. Fe3O4@SiO2 nanoparticles have high chemical stability and magnetic saturation. A plausible formation mechanism of these nanoparticles is also presented.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Wenhao Fan,Shaoping Chen,Bo Zeng,Qiang Zhang,Qingsen Meng,Wenxian Wang,Zuhair A. Munir
Solid solutions of Mg2Si0.6Sn0.4–xBix with 0 ≤ x ≤ 0.03 were prepared by a one-step synthesis and consolidation method, using MgH2 as a starting material. The thermoelectric properties of these samples were evaluated over the temperature range 300–775 K. Figure of merit, zT, values were determined over this range for all compositions and found to increase with temperature reaching a value of 1.36 at 775 K for samples with x = 0.02. Examination of the components of the total thermal conductivity showed that the bipolar thermal conductivity is suppressed by an increase in the band gap, resulting from solid solution formation, and by low minority carrier mobility. The suppression of the bipolar thermal conductivity is believed to be the consequence of charged grain boundaries.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Cijun Shuai,Chong Lin,Chongxian He,Wei Tan,Shuping Peng,Wenjing Yang
Bone implant-associated bacterial infection is a common cause of transplant failure. Chemodynamic therapy (CDT) has significant antibacterial efficacy by producing reactive oxygen species (ROS). However, the ROS permeability is restricted by the natural barrier of bacterial biofilms. Herein, a hard-soft magnetic biphasic nanoparticle (CF@MF) was synthesized by in-situ growth of the soft MnFe 2 O 4 shell on the hard CoFe 2 O 4 core. Then, the CF@MF was incorporated into poly- l -lactide powders to prepare porous scaffolds by selective laser sintering. The scaffold exhibited superior magnetothermal conversion efficiency, which was attributed to the interfacial exchange coupling of CF@MF. Importantly, the scaffold effectively dispersed biofilms by magnetothermal therapy (MTT), favoring numerous ROS pre-generated by CDT to enter the interior to kill bacteria. This study provided a synergistic MTT/CDT strategy to eradicate deep bacterial infections in biomedical application.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Beijia Yuan,Liang Bao,Huaiwei zhang,Yong-jun Yuan
In this paper, carbon supported Bi 2 O 3 -BiOCl-Bi heterostructures were successfully synthesized via a facile and simple hydrothermal method. A series of structure and morphology testing clearly showed that carbon and metallic Bi were deposited on the surface margin of Bi 2 O 3 -BiOCl, which benefited the rapid transfer of internal photogenerated electrons. Photophysical experiments including electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) indicated that the amount of surface oxygen vacancies (OVs) was significantly increased, which act as reactive active sites and therefore effectively enhance the photocatalytic performance. The photocatalytic N 2 reduction yield of C@Bi 2 O 3 -BiOCl-Bi was remarkably improved to 400 μg·L −1 , which was 3.63 times higher than that of BiOCl. This research demonstrated a feasible strategy to construct advanced photocatalyst by incorporating defect-rich structures and surface engineering.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Xiaochen Zhang,Jiahong Jian,Zisheng Luo,Guo Li,Yifeng Huang,Yue Wu,Dong Li,Li Li
The fabrication of multi-component film with colloidal particles could be inconvenient. A novel “swell-permeate” (SP) strategy was proposed to form homogeneous multi-component films. The SP strategy allows colloidal particles to fit into the polymer network by stretching the polymer chains assisted by water. We demonstrated the strategy by creating films with polysaccharide substrates as β-cyclodextrin grafted chitosan (CS) with nanocellulose. The addition of nanocellulose significantly increased the mechanical properties and the barrier performance of the films. The size of nanocellulose particles in affecting mechanical properties was investigated by applying different length of cellulose nanocrystal (CNC), the longer of which, due to denser physical entanglements, showed a better increase to the film in the elastic modulus and tensile strength to 4.54-fold and 5.71-fold, respectively. The films were also loaded with ethyl- p -coumarate (EpCA) and had an enhanced performance in anti-microbial for Altenaria alternata , Salmonella typhi , and Escherichia coli . The anti-oxidative property was increased as well, and both effects were valid both in vitro and in ready-to-eat apples. The strategy provides a practical and convenient method for fabricating colloidal particle containing films, and the novel idea of “swell-permeate” is potentially regarded as a new solution to the challenge of ready-to-eat food quality maintenance.
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高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Pengcheng Xiang,Lili Wang,Qin Geng,Changyan Guo,Hongtao Xie,Yizhao Li,Yangyang Yu,Jide Wang
Structural design of semiconductor photocatalysts plays an important role in promoting light absorption, molecular activation, and charge separation in the CO 2 reduction reaction, which is beneficial for improving photocatalytic activity. In this paper, a simple photodeposition strategy was employed to load Cu onto Bi 2 O 2 SO 4 and form a Cu-Bi alloy. Under simulated sunlight conditions, the optimal catalyst demonstrates impressive photocatalytic activity and selectivity for CO 2 reduction, with a corresponding yield of 18.8 μmol g -1 h -1 , 15 times higher than that of pure Bi 2 O 2 SO 4 , and CO selectivity reaching 97.1%. The results indicate that metal deposition enhances light absorption utilization efficiency and promotes the separation and transfer of photogenerated carriers. Additionally, the combination of in-situ FT-IR spectra and theoretical calculations reveal the molecular mechanisms of photocatalytic CO 2 reduction. This work discusses the synergistic effect of metal deposition and oxygen vacancies on photocatalytic reduction of CO 2 , providing a feasible method for constructing metal deposition structures with defects.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 2
·e56342
·
IF 2.7
Dongchen Chen,Yan Li,Jinzhe Li,Yaru Wang,Hao Ye,Mengyao Zhao,Wanjing Li,Bin Yang,Xianglong Li
To solve the problem of cytotoxicity for most antimicrobial agents loaded in packaging materials, we developed a novel bi-layer fibrous membrane by using centrifugal spinning, which of the outer layer was submicron native potato starch/polyvinyl alcohol (ST/PVA) composite fibers loaded with ZnO nanoparticles (ZnO NPs) for providing high antibacterial activity. The inner layer was nano-based calcium alginate/polyethylene oxide (CA/PEO) fiber for providing excellent biocompatibility. The addition of ZnO caused the semicrystalline structures of ST/PVA fibers, while the CA/PEO fibers were shown semicrystalline structures due to the PEO. Fourier transform infrared indicated that posttreatment had not effect on the structures of ST/PVA/ZnO fiber, but the structure of CA/PEO fibers were affected by interaction between COO groups of alginate and Ca 2+ ions. The results of mechanical property demonstrated that CA/PEO fibers showed highest stress of 3.83 ± 0.25 MPa and helpful for improving the stress of bi-layer fibrous membrane. The obtained fibrous membrane had excellent antibacterial property with diameters of bacteriostatic zone against E. coli and S. aureus of 20.5 and 21.5 mm, respectively. On this basis, the shelf life of strawberry was improved up to 6th day by inhibit the growth of microorganisms, which indicated that the obtained fibrous membrane showed great potential for food packaging.
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