ACTA MATERIALIA
·
2021
·
IF 8.203
Jie Chen,Qiang Sun,Deyu Bao,Bang-Zhou Tian,Zegao Wang,Jun Tang,Dali Zhou,Lei Yang,Zhi-Gang Chen
Thermoelectric materials strengthened by defect engineering can also suffer from the compromise of plasticity, and in turn results in negative effect on the processability, reliability and durability of thermoelectric devices. Here, we introduce nano-twinned CuAgSe secondary phase to achieve simultaneously increased compressive strength and plasticity of the β-Ag 2 Se pellets without obviously sacrificing the thermoelectric performance, as evidenced by our thermoelectric measurements. Our pellet shows a maximum compressive strength of 96 MPa, which is ∼104% higher than that of pristine Ag 2 Se, ascribed to the impeded crack propagation by the CuAgSe secondary phase. An extraordinary deformation value of ∼19% is observed at the maximum compressive strength, which is attributed to the intrinsically large plastic deformation of the Ag 2 Se matrix, the deformable nano-twinned CuAgSe secondary as well as the interaction between the Ag 2 Se matrix and the CuAgSe secondary phase. This work indicates that introducing nano-twinned secondary phase in thermoelectric materials is a promising strategy for developing high-performance thermoelectric materials with high strength and plasticity.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Jiawei Mao,Tianping Huang,Subrata Panda,Jianxin Zou,Wenjiang Ding
In this work, Mg(In) and Mg(Ag) solid-solution ultrafine particles were successfully synthesized by using a direct current (DC) arc-plasma method and their hydrogen storage and hydrolysis behaviors were thoroughly investigated. In particular, microstructural analyses clearly reveal that MgH 2 @MgIn and MgH 2 @MgAg composites are autogenerated upon hydrogenation via the formation of nano MgIn or MgAg intermetallic phase on MgH 2 : Mg(In/Ag) + H 2 ⟷ MgH 2 + MgIn/MgAg. Upon dehydrogenation, in-situ TEM observations confirm that the reverse reaction occurs through the diffusion of In/Ag from the MgIn/MgAg phase to MgH 2 . Such a diffusion process is coupled with the decomposition of MgH 2 , leading to the microstructural transition from MgH 2 @MgIn or MgH 2 @MgAg to corresponding solid solutions. For Mg-In system, the discovery of the intermediate phase Mg 3 In through in-situ TEM observation indicates that the dehydrogenation process is a two-step reaction dominated by the diffusion of In. Meantime, the improved hydrolysis performances of the MgH 2 @MgIn and MgH 2 @MgAg composites are primarily attributed to the direct participation of MgIn/MgAg in the hydrolysis reaction, providing more active sites for accelerating hydrogen yield. Therefore, the introduction of In or Ag into Mg has provided with noticeable improvements in the hydrogen storage as well as the hydrolysis properties of MgH 2 .
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2021
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IF 5.279
Mengting Ni,Xin Song,Junhui Pan,Deming Gong,Guowen Zhang
In this study, the antiglycation potential and mechanisms of vitexin were explored in vitro by multispectroscopy, microscope imaging, high-resolution mass spectrometry, and computational simulations. Vitexin was found to show much stronger antiglycation effects than aminoguanidine. The inhibition against the fluorescent advanced glycation end products was more than 80% at 500 μM vitexin in both bovine serum albumin (BSA)–fructose and BSA–methylglyoxal (MGO) models. Treated with 100 and 200 μM vitexin for 24 h, the contents of MGO were reduced to 4.97 and 0.2%, respectively, and only one vitexin–mono-MGO adduct was formed. LC–Orbitrap-MS/MS analysis showed that vitexin altered the glycated sites and reduced the glycation degree of some sites. The mechanisms of vitexin against protein glycation were mainly through BSA structural protection, MGO trapping, and alteration of glycation sites induced by interaction with BSA. These findings provided valuable information about the functional development of vitexin as a potential antiglycation agent.
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JOURNAL OF POWER SOURCES
·
2020
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IF 8.247
Zhijie Wang,Tengfei Li,Qihao Wang,Anxiang Guan,Na Cao,Abdullah M. Al-Enizi,Lijuan Zhang,Linping Qian,Gengfeng Zheng
Silver-containing material is one of the efficient electrocatalysts in converting CO 2 into CO , but competing hydrogen evolution reaction (HER) in aqueous solutions results in poor energy efficiency. Here, Ag 3 subnanoclusters with the structure sensitive to CO 2 activation are in situ prepared by the cyclohexene oxidation . Hydrophobically modified Ag nanomaterials with an average particle size from 1.0 to 3.3 nm are water-repulsive, organic-soluble, and composited of the Ag 3 cluster units, possessing the electron donation and strong chemical adsorption of CO 2 . In the electroreduction of CO 2 , a high mass activity about 10,200 A cm −2 g Ag −1 is achieved for CO production at −1.4 V vs. reverse hydrogen electrode (RHE) on Ag nanoclusters with the external size of 1.9 nm, exhibiting 20 times higher than commercial Ag nanoparticles (diameters of 60–120 nm). Electrochemical tests in flow cells show an excellent mass activity of 55,000 A cm −2 g Ag −1 with a large current density of around 30 mA cm −2 for the CO production at −0.71 V vs. RHE, much higher than the previously reported Ag catalysts. Hydrophobically made Ag 3 subnanoclusters facilitate the CO 2 electroreduction to CO in aqueous solutions through accelerating the electron donation and suppressing the side reaction of water reduction.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Ling Zhang,Hongjun Ji,Houbing Huang,Ning Yi,Xiaoming Shi,Senpei Xie,Yaoyin Li,Ziheng Ye,Pengdong Feng,Tiesong Lin,Xiangli Liu,Xuesong Leng,Mingyu Li,Jiaheng Zhang,Xing Ma,Peng He,Weiwei Zhao,Huanyu Cheng
A soft body area sensor network presents a promising direction in wearable devices to integrate on-body sensors for physiological signal monitoring and flexible printed circuit boards (FPCBs) for signal conditioning/readout and wireless transmission. However, its realization currently relies on various sophisticated fabrication approaches such as lithography or direct printing on a carrier substrate before attaching to the body. Here, we report a universal fabrication scheme to enable printing and room-temperature sintering of the metal nanoparticle on paper/fabric for FPCBs and directly on the human skin for on-body sensors with a novel sintering aid layer. Consisting of polyvinyl alcohol (PVA) paste and nanoadditives in the water, the sintering aid layer reduces the sintering temperature. Together with the significantly decreased surface roughness, it allows for the integration of a submicron-thick conductive pattern with enhanced electromechanical performance. Various on-body sensors integrated with an FPCB to detect health conditions illustrate a system-level example.
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Applied Nanoscience
·
2021
·Vol. 11
·期 3
·841-847
·
IF 3.674
Yi J.,Yang M. M.,Luo X. D.,Rosenkranz A.,Wang B.,Song H.,Jiang N.
This study aims at assessing the tribological performance of novel self-lubricating chemical vapor-deposited MoS 2 coatings binary-doped with antimony (Sb) and silver (Ag). The Sb/Ag-doped MoS 2 composite coatings showed an excellent solid lubrication performance with low and constant coefficients of friction of about 0.1 for a sliding time of 6 h. Estimations of the underlying wear rates revealed a reduction of the resulting wear rate by two orders of magnitude for the binary-doped Sb/Ag–MoS 2 composite coatings (2.43 ± 0.27 × 10 –7 mm 3 /Nm versus 2.70 ± 0.44 × 10 –5 mm 3 /Nm for un-doped MoS 2 coating), which reflects an outstanding wear resistance.
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ELECTROCHIMICA ACTA
·
2020
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IF 6.215
Yunming Jia,Arsalan Ahmed,Xiaying Jiang,Lan Zhou,Qinguo Fan,Jianzhong Shao
The growing demands for wearable, portable, and flexible textile electronics have attracted enormous attention in this field and technology. Herein, we put forward a controllable method of microfluidic fabrication strategy to synthesize superconductive carbon black/graphene composite fibers (SCB/GFs). The SCB/GFs demonstrate large specific surface areas (296.236 m 2 g −1 , average pore size of 2.6 nm), high electrical conductivity (22316 S m −1 ), and good mechanical flexibility. Moreover, a flexible supercapacitor (CGSC) assembled by SCB/GFs is successfully manufactured. As expected, the CGSCs display outstanding electrochemical performances, including large specific capacitance (volume capacitance, 176.6 F cm −3 , mass capacitance, 241.8 F g −1 ), high energy densities (5.6 mWh cm −3 ), and superior long-period cyclic stability (92.6% retention after 10000 charge-discharge cycles). Based on these excellent performance, we further employ the assembled CGSCs coated with organic ionic liquid electrolyte (EMIMBF 4 /PVDF/DMF) to power an electronic timer and some light emission diode lamps when it is completely charged, exhibiting the enormous capability as highly effective electrode materials for energy storage devices.
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JOURNAL OF POWER SOURCES
·
2020
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IF 8.247
Zhen Sun,Yanqing Lai,Na Lv,Liangxing Jiang,Ming Jia,Jie Li,Weizhai Bao,Fangyang Liu
Solid-state batteries (SSBs) exhibit a promising prospect due to their potential in terms of safety and energy densities . As an oxide electrolyte, cubic garnet solid electrolyte (cubic-Li 7 La 3 Zr 2 O 12 ) attracts wide attention due to the high ionic conductivity . However, the problem of poor contact between garnet solid electrolyte and lithium impairs the development of solid electrolytes. Herein, we demonstrate an effective modification method to cope with the interface issue between electrolyte and Li metal by introducing an Ag@WSe 2 composite layer. By applying this method, the interfacial resistance between the garnet electrolyte and Li metal is reduced to ~12.5 Ω cm 2 , which is nearly 150 times lower than the value of 1900 Ω cm 2 before modification. The WSe 2 acts as a framework to immobilize Ag, while Ag forms an Ag–Li alloy with lithium for lithium ions transportation. And other Ag@TMDs (transition metal dichalcogenides) composites have also been proven to have similar effects. In addition, the Li | Ag@WSe 2 -LLZO | LFP full cell demonstrates a satisfactory capacity and excellent cycle stability (500 cycles with 90% capacity retention rate) at room temperature .
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 21
·26276-26304
·
IF 3.056
Xiao Dingtian,Qing Shan,Chen Pengfei,Yu Zhifeng,Xiao Huaqiang,Wang XiaoDing
In this study, a diversified waste recycling system and a green processing technology are proposed. This research not only finds feasible solutions to alleviate environmental problems of plastic pollution and straw burning but also provides new reuse methods for oyster shell waste and hogwash oil. The developed noval biocomposite material is conducive to the green development of express industry. This paper evaluates the performance of materials from many aspects: X-ray computed tomography characterization, fundamental physical properties, mechanical properties, microscopic morphology, SEM morphology, and comprehensive performance of products. Two kinds of products with economic value are found. One is sample 4, which is suitable for making granular products due to its low cost (0.328$/500 g). Another is sample 13, which is suitable for manufacturing green packaging materials due to its excellent mechanical properties (tensile strength 14.15 MPa; elongation at break 12.68%; Young’s modulus 8189.89 MPa). Based on the experimental results, the process of the composite is simulated to study the different strengthening mechanisms of arabic gum and poly(methyl vinyl ether-alt-maleic anhydride). Arabic gum uses chemical reaction and principle of similarity and intermiscibility to fuse with biomass to form homogeneous hybrid in the form of liquid gel. Poly(methyl vinyl ether-alt-maleic anhydride) indirectly adheres filler to the matrix through ring-opening reaction and structural similarity. The new emulsification system caused by arabic gum promotes the arabic gum and nano-fluid coupling cross-linking system to produce a decentralized cross-linked network and inhibit the pernicious molecular chain entanglement.
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Nano Energy
·
2020
·
IF 16.602
Tao Yang,Hong Pan,Guo Tian,Binbin Zhang,Da Xiong,Yuyu Gao,Cheng Yan,Xiang Chu,Ningjun Chen,Shen Zhong,Lei Zhang,Weili Deng,Weiqing Yang
Piezoelectric-based wearable electronics promise potential applications in human physiological monitoring for disease prediction, diagnose and rehabilitation. Still, it is a big challenge to fulfill excellent compatibility and precisely monitoring of the complexly subtle physiological signals simultaneously. Here, we prepared a three-dimensional hierarchically interlocked PVDF/ZnO nanofiber-based piezoelectric sensor through epitaxial growing ZnO nano rods (NRs) on the surface of electrospun PVDF nanofibers, which enables the fiber-based physiological monitoring electronics (PME) of well flexibility and high gas permeability . Due to synergistic piezoelectric effect of the effectively deformed interlocked ZnO NRs and the uniformly orientated PVDF nanofibers with high electroactive phase, the sensitivities of PME in both pressing and bending modes have been greatly improved 6 times and 41 times than that of pure PVDF nanofibers respectively. On this basis, the designed PME can precisely detect the complexly subtle physiological signals of respiration, wrist pulse and muscle behavior. Moreover, a sensitive gait recognition system was successfully developed based on PME arrays. Therefore, this proposed fiber-based device provides an alternative strategy to monitor the human subtle physiological signals and demonstrates promising potential in the expanded application of healthcare and clinical diagnosis.
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Science Advances
·
2020
·Vol. 6
·期 15
·
IF 13.117
Shiyang He,Yongbo Li,Lu Liu,Ying Jiang,Jingjing Feng,Wei Zhu,Jiye Zhang,Zirui Dong,Yuan Deng,Jun Luo,Wenqing Zhang,Gang Chen
Most crystalline inorganic materials, except for metals and some layer materials, exhibit bad flexibility because of strong ionic or covalent bonds, while amorphous materials usually display poor electrical properties due to structural disorders. Here, we report the simultaneous realization of extraordinary room temperature flexibility and thermoelectric performance in Ag2Te1–xSx–based materials through amorphization. The coexistence of amorphous main phase and crystallites results in exceptional flexibility and ultralow lattice thermal conductivity. Furthermore, the flexible Ag2Te0.6S0.4 glass exhibits a degenerate semiconductor behavior with a room temperature Hall mobility of ~750 cm2 V−1 s−1 at a carrier concentration of 8.6 × 1018 cm−3, which is at least an order of magnitude higher than other amorphous materials, leading to a thermoelectric power factor also an order of magnitude higher than the best amorphous thermoelectric materials known. The in-plane prototype uni-leg thermoelectric generator made from this material demonstrates its potential for flexible thermoelectric device.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Faqiang Shi,Zhonghua Li,Limeng Liu,Jiandong Wu,Jinfu Ma,Yujin Wang
In previous works, it was found hard to synthesize “phase pure” ζ-Ta 4 C 3-z at relatively low temperatures even by prolonged heating, though ζ-Ta 4 C 3-z was believed stable till decomposition at ~2130°C. When the samples were subjected to TEM , vast richness of locally disordered structures in close relation with stacking of the close-pacted Ta-atom planes was observed. Although kinetic factors including diffusion of C atoms/vacancies and re-stacking of the Ta-atom planes explain the densely disordered structures, the richness of local disorders is a scenario that shows cohabitant of the cubic, rhombohedral, and hexagonal structures in a single grain, i.e. formation of a “hybrid grain” consisted of the three symmetries, indicating a transitional or intermediate stage before complete formation of the final phase of rhombohedral ζ-Ta 4 C 3-z . This time tantalum carbide ceramics TaC x with C:Ta atomic ratios x = 0.66 and 0.7 were prepared by reaction hot pressing of TaC and Ta powder mixtures. 5–30 mol% Cu/Ag additives and heat treatments were used to reproduce “hybrid grains” to facilitate further TEM and HRTEM observations on the disordered hybrid grains to argue for the transitional/intermediate stage. The cohabitant cubic, rhombohedral, and hexagonal structures in single grains may also help explain the difficulty in identification of the various phases by XRD in the transitional/intermediate stage of ζ-Ta 4 C 3-z reaction. Microstructural evolution and fracture toughness of the composites were also investigated.
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