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https://www.readbyqxmd.com/read/28937206/rod-like-sb2se3-wrapped-with-carbon-the-exploring-of-electrochemical-properties-in-sodium-ion-batteries
#1
Peng Ge, Xiao-Yu Cao, Hongshuai Hou, Sijie Li, Xiaobo Ji
One-dimensional Sb2Se3/C rods are prepared through self-assembly from the inducing of anisotropy, and the corresponding sodium storage behaviors are evaluated, presenting excellent electrochemical performances with superior cycle stability and rate capability. The Sb2Se3 delivers a high initial charge capacity of 657.6 mAh g-1 at current density of 0.2 A g-1 between 2.5 and 0.01 V. After 100 cycles, the reversible capacity of Sb2Se3/C remain 485.2 mAh g-1. Even at high rate current density of 2.0 A g-1, the charge capacity still remains 311...
September 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28936498/biredox-ionic-liquids-new-opportunities-toward-high-performance-supercapacitors
#2
C Bodin, E Mourad, D Zigah, S Le Vot, S A Freunberger, F Favier, O Fontaine
Nowadays commercial supercapacitors are based on purely capacitive storage at the porous carbons that are used for the electrodes. However, the limits that capacitive storage imposes on energy density calls to investigate new materials to improve the capacitance of the device. This new type of electrodes (e.g., RuO2, MnO2…) involves pseudo-capacitive faradaic redox processes with the solid material. Ion exchange with solid materials is, however, much slower than the adsorption process in capacitive storage and inevitably leads to significant loss of power...
September 22, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28934141/facile-synthesis-of-zno-nanoparticles-on-nitrogen-doped-carbon-nanotubes-as-high-performance-anode-material-for-lithium-ion-batteries
#3
Haipeng Li, Zhengjun Liu, Shuang Yang, Yan Zhao, Yuting Feng, Zhumabay Bakenov, Chengwei Zhang, Fuxing Yin
ZnO/nitrogen-doped carbon nanotube (ZnO/NCNT) composite, prepared though a simple one-step sol-gel synthetic technique, has been explored for the first time as an anode material. The as-prepared ZnO/NCNT nanocomposite preserves a good dispersity and homogeneity of the ZnO nanoparticles (~6 nm) which deposited on the surface of NCNT. Transmission electron microscopy (TEM) reveals the formation of ZnO nanoparticles with an average size of 6 nm homogeneously deposited on the surface of NCNT. ZnO/NCNT composite, when evaluated as an anode for lithium-ion batteries (LIBs), exhibits remarkably enhanced cycling ability and rate capability compared with the ZnO/CNT counterpart...
September 21, 2017: Materials
https://www.readbyqxmd.com/read/28933559/-parallel-investigations-of-blood-and-alveolar-air-in-the-diagnosis-of-lethal-carbon-monoxide-poisoning
#4
Miroslav Bauer, Jiřina Bauerová, Peter Očko, Jozef Šidlo
Carbon monoxide poisonings are the most frequent among fatal gas and volatile substances intoxications. The authors present diagnostic options of fatal carbon monoxide poisoning by parallel blood investigations for the content of karbonylhaemoglobin and determining of the concentration of carbon monoxide in the alveolar air. The analysis of 160 cases of lethal poisonings with carbon monoxide over a period of 20 years was carried out. The cases were divided into subgroups according to the place of death to poisonings in flats, garages, bathrooms, in fires, road traffic accidents and mining accidents...
2017: Soudní Lékarství
https://www.readbyqxmd.com/read/28933481/bowl-shaped-deformation-in-a-planar-aromatic-polycycle-upon-reduction-li-and-na-separated-dianions-of-the-aromatic-polycycle-5-6-11-12-di-o-phenylene-tetracene
#5
T Wombacher, R Goddard, C W Lehmann, J J Schneider
Herein we report the synthesis and crystal structures of three light alkali metal salts of the dianion of the polycyclic aromatic hydrocarbon 5,6:11,12-di-o-phenylenetetracene (LDOPT). The compounds are obtained by reaction of LDOPT with an excess of lithium or sodium metal in different O-donor solvents (DME, diglyme) and crystallize as naked, solvated-cation separated dianions exhibiting no interaction between the alkali metal ion and the aromatic π-system of LDOPT. Depending on the aprotic etheral solvent and the hardness of the alkaline metal agent a significant structural perturbation of the conjugated carbon framework of LDOPT is observed resulting in a bowl shaped curvature of the anionic π-perimeter, in contrast to its fully planar neutral state...
September 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28933161/identifying-the-structural-basis-for-the-increased-stability-of-the-solid-electrolyte-interphase-formed-on-silicon-with-the-additive-fluoroethylene-carbonate
#6
Yanting Jin, Nis-Julian H Kneusels, Pieter C M M Magusin, Gunwoo Kim, Elizabeth Castillo-Martinez, Lauren E Marbella, Rachel N Kerber, Duncan J Howe, Subhradip Paul, Tao Liu, Clare P Grey
To elucidate the role of fluoroethylene carbonate (FEC) as an additive in the standard carbonate-based electrolyte for Li-ion batteries, the solid electrolyte interphase (SEI) formed during electrochemical cycling on silicon anodes was analyzed with a combination of solution and solid-state NMR techniques, including dynamic nuclear polarization. To facilitate characterization via 1D and 2D NMR, we synthesized (13)C-enriched FEC, ultimately allowing a detailed structural assignment of the organic SEI. We find that the soluble PEO-like linear oligomeric electrolyte breakdown products that are observed after cycling in the standard ethylene carbonate (EC)-based electrolyte are suppressed in the presence of 10 vol % FEC additive...
September 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28932676/carbon-nanofibers-heavy-laden-with-li3v2-po4-3-particles-featuring-superb-kinetics-for-high-power-lithium-ion-battery
#7
Jeongyim Shin, Junghoon Yang, Chernov Sergey, Min-Sang Song, Yong-Mook Kang
Fast lithium ion and electron transport inside electrode materials are essential to realize its superb electrochemical performances for lithium rechargeable batteries. Herein, a distinctive structure of cathode material is proposed, which can simultaneously satisfy these requirements. Nanosized Li3V2(PO4)3 (LVP) particles can be successfully grown up on the carbon nanofiber via electrospinning method followed by a controlled heat-treatment. Herein, LVP particles are anchored onto the surface of carbon nanofiber, and with this growing process, the size of LVP particles as well as the thickness of carbon nanofiber can be regulated together...
September 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28930696/impact-of-a-newly-formed-periglacial-environment-and-other-factors-on-fresh-water-chemistry-at-the-western-shore-of-admiralty-bay-in-the-summer-of-2016-king-george-island-maritime-antarctica
#8
Małgorzata Szopińska, Danuta Szumińska, Robert Józef Bialik, Stanisław Chmiel, Joanna Plenzler, Żaneta Polkowska
This study provides a comprehensive analysis of the inorganic chemistry of flowing water at the western shore of Admiralty Bay. In the water samples, ions, and major and trace metals (and B) were detected and quantified. Additionally, the parameters of pH, specific electrolytic conductivity (SEC25) and total organic carbon (TOC) were determined. Moreover, multivariate data set was created and Principal Component Analysis (PCA) was performed. Generally, the water has low total content of the measured mineral constituents <100mgL(-1)...
September 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28930446/probing-coordination-complexes-by-carbon-nanotube-assisted-low-voltage-paper-spray-ionization-mass-spectrometry
#9
Rahul Narayanan, Thalappil Pradeep
Fragile transition metal complex ions such as [Cr(H2O)4Cl2]+, difficult to be observed by gas phase spectroscopy, are detected easily with carbon nanotube (CNT) assisted low voltage ambient ionization mass spectrometry. Observation of various substituted ions with D2O and ROH (R = CH3, C2H5…) established the versatility of the technique in detecting diverse species. Ligand substitution occurring in solution was captured by the low voltage technique. Extreme softness of the technique coupled with nanoscale ion sources enabled the creation of such species...
September 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28930102/confirming-the-key-role-of-ar-ion-bombardment-in-growth-feature-of-nanostructured-carbon-materials-by-pecvd
#10
Yulin Liu, Jinghuang Lin, Henan Jia, Shulin Chen, J Qi, Chaoqun Qu, Jian Cao, Jicai Feng, Weidong Fei
In order to confirm the key role of plasma etching in growth feature of nanostructured carbon materials (NCMs), here we reported a novel strategy to in-situ create different states of plasma etching conditions in plasma enhanced chemical vapor deposition (PECVD) by separating catalyst film from substrate. Different plasma-related environments on either side of the catalyst film were created simultaneously for achieving multi-layered structural NCMs. Results showed that plasma etching is observed crucial and complex for the growth of NCMs...
September 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28927342/expert-opinion-biomimetic-functionalized-surfaces-and-the-induction-of-bone-formation
#11
Ugo Ripamonti
Tissue engineering still needs to assign the molecular basis of pattern formation, tissue induction and morphogenesis: What next to morphogens and stem cells? Macroporous biomimetic matrices per se, without the addition of the soluble osteogenic molecular signals of the transforming growth factor-β (TGF-β) supergene family, initiate the induction of bone formation. Carving geometries within different calcium phosphate-based macroporous bioreactors we show that geometric cues imprinted within the macroporous spaces initiate the spontaneous induction of bone...
September 19, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28927267/atomistic-origins-of-high-capacity-and-high-structural-stability-of-polymer-derived-sioc-anode-materials
#12
Hong Sun, Kejie Zhao
Capacity and structural stability are often mutually exclusive properties of electrodes in Li-ion batteries: A gain in capacity is usually accompanied by the undesired large volumetric change of the host material upon lithiation. Polymer-derived ceramics, such as silicon oxycarbide (SiOC) of hybrid Si-O-C bonds, show an exceptional combination of high capacity and superior structural stability. We investigate the atomistic origins of the unique chemomechanical performance of carbon-rich SiOC using the first-principles theoretical approach...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28926220/facile-construction-of-novel-3-dimensional-graphene-amorphous-porous-carbon-hybrids-with-enhanced-lithium-storage-properties
#13
Daming Zhu, Huaqiu Liu, Lixuan Tai, Xiaonan Zhang, Sheng Jiang, Shumin Yang, Lin Yi, Wen Wen, Xiaolong Li
Nowadays, porous materials become essential to many technological applications. In this account, 3-dimensional skeleton composite materials consisted of a core-shell amorphous porous carbon/multi-layer graphene are synthesized by chemical vapor deposition on Ni foam using a facile one-step growth method. The data suggest that these composites have not only outstanding electrical and mechanical properties of the multi-layer graphene but also the mesoporous characteristics of the amorphous carbon. Moreover, the composited carbon materials perfectly inherit the macroporous structure of Ni foam, and the amorphous carbon core in the skeleton serves as a cushion to buffer the volume variation after the removal of Ni...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28926060/mg-doped-li2fesio4-c-nanocomposites-synthesized-by-the-solvothermal-method-for-lithium-ion-batteries
#14
Ajay Kumar, O D Jayakumar, Jagannath, Parisa Bashiri, G A Nazri, Vaman M Naik, Ratna Naik
A series of porous Li2Fe1-xMgxSiO4/C (x = 0, 0.01, 0.02, 0.04) nanocomposites (LFS/C, 1Mg-LFS/C, 2Mg-LFS and 4Mg-LFS/C) have been synthesized via a solvo-thermal method using the Pluronic P123 polymer as an in situ carbon source. Rietveld refinement of the X-ray diffraction data of Li2Fe1-xMgxSiO4/C composites confirms the formation of the monoclinic P21 structure of Li2FeSiO4. The addition of Mg facilitates the growth of impurity-free Li2FeSiO4 with increased crystallinity and particle size. Despite having the same percentage of carbon content (∼15 wt%) in all the samples, the 1Mg-LFS/C nanocomposite delivered the highest initial discharge capacity of 278 mA h g(-1) (∼84% of the theoretical capacity) at the C/30 rate and also exhibited the best rate capability and cycle stability (94% retention after 100 charge-discharge cycles at 1C)...
September 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28926049/one-pot-synthesis-of-multicomponent-mo-co-metal-sulfide-carbon-nanoboxes-as-anode-materials-for-improving-na-ion-storage
#15
Juan Xiang, Taeseup Song
Multicomponent MoS2/Co9S8/C hollow nanocubes were developed by the one-pot solvothermal method and a subsequent calcination process. Benefitting from the merits of hollow structures, the highly-conductive carbon matrix and the buffering effect provided by uniformly-mixed MoS2 and Co9S8, the MoS2/Co9S8/C anode shows high capacity and rate capability as the anode of sodium-ion batteries.
September 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28926044/running-out-of-lithium-a-route-to-differentiate-between-capacity-losses-and-active-lithium-losses-in-lithium-ion-batteries
#16
Florian Holtstiege, Andrea Wilken, Martin Winter, Tobias Placke
Active lithium loss (ALL) resulting in a capacity loss (QALL), which is caused by lithium consuming parasitic reactions like SEI formation, is a major reason for capacity fading and, thus, for a reduction of the usable energy density of lithium-ion batteries (LIBs). QALL is often equated with the accumulated irreversible capacity (QAIC). However, QAIC is also influenced by non-lithium consuming parasitic reactions, which do not reduce the active lithium content of the cell, but induce a parasitic current. In this work, a novel approach is proposed in order to differentiate between QAIC and QALL...
September 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28925924/in-situ-preparation-of-fe-sub-3-sub-o-sub-4-sub-in-a-carbon-hybrid-of-graphene-nanoscrolls-and-carbon-nanotubes-as-high-performance-anode-material-for-lithium-ion-batteries
#17
Yuewen Liu, Ahmad Hassan Siddique, Heran Huang, Qile Fang, Wei Deng, Xufeng Zhou, Huanming Lu, Z P Liu
A new conductive carbon hybrid combining both graphene nanoscrolls and carbon nanotubes (rGNSs-CNTs) is prepared, and used to host Fe3O4 nanoparticles through an in situ synthesis method. As an anode material for LIBs, the obtained Fe3O4@rGNSs-CNTs shows good electrochemical performance. At a current density of 0.1 A g-1, the anode material shows a high reversible capacity of 1232.9 mAh g-1 after 100 cycles. Even at a current density of 1 A g-1, it still achieves a high reversible capacity of 812.3 mAh g-1 after 200 cycles...
September 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28925684/carbon-nanotube-based-ion-selective-sensors-for-wearable-applications
#18
Soumyendu Roy, Moshe David-Pur, Yael Hanein
Wearable electronics offer new opportunities in a wide range of applications, especially sweat analysis using skin sensors. A fundamental challenge in these applications is the formation of sensitive and stable electrodes. In this article we report the development of a wearable sensor based on carbon nanotube (CNT) electrode arrays for sweat sensing. Solid-state ion selective electrodes (ISEs), sensitive to Na+ ions, were prepared by drop coating plasticized poly-vinyl chloride (PVC) doped with ionophore and ion exchanger on CNT electrodes...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28925265/janus-electrochemistry-asymmetric-functionalization-in-one-step
#19
David Ibañez, Elisa Vallés, Elvira Gómez, Alvaro Colina, Aranzazu Heras
Janus structures represent an overwhelming member of materials with adaptable chemical and physical properties. The development of new synthesis routes has allowed the fabrication of Janus architectures with specific characteristics depending on the final applications. In the case of the membranes, the improvement of wet routes has been limited to the capillary effect, in which the solution can gradually penetrate through the membrane avoiding a double modification, different at each face of the membrane. In this work, we propose a new electrochemical methodology to circumvent the capillary limitation and to obtain a double electrochemical functionalization in only one step in a controlled way...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28924742/characterization-of-pm2-5-in-delhi-role-and-impact-of-secondary-aerosol-burning-of-biomass-and-municipal-solid-waste-and-crustal-matter
#20
Pavan K Nagar, Dhirendra Singh, Mukesh Sharma, Anil Kumar, Viney P Aneja, Mohan P George, Nigam Agarwal, Sheo P Shukla
Delhi is one among the highly air polluted cities in the world. Absence of causal relationship between emitting sources of PM2.5 and their impact has resulted in inadequate actions. This research combines a set of innovative and state-of-the-art analytical techniques to establish relative predominance of PM2.5 sources. Air quality sampling at six sites in summer and winter for 40 days (at each site) showed alarmingly high PM2.5 concentrations (340 ± 135 μg/m(3)). The collected PM2.5 was subjected to chemical speciation including ions, metals, organic and elemental carbons which followed application of chemical mass balance technique for source apportionment...
September 18, 2017: Environmental Science and Pollution Research International
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