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Rencheng Jin, Hua Jiang, Qingyao Wang, Guihua Li, Shanmin Gao
Compare to single component material, the hybrids materials with various components display superior electrochemical performance. In this work, two dimensional CoSx@NC@Sb nanosheets assembled by ultrathin CoSx nanosheets (~4 nm), thin layer of N-doped amorphous carbon combined with colloid like Sb nanoparticles are designed and synthesized via solvothermal route accompanied by carbonization and Sb deposition procedure. If applied in lithium-ion batteries, the hybrids exhibit the specific capacity of 960 mAh g-1 at the 100th cycle at 0...
December 8, 2017: ACS Applied Materials & Interfaces
Feng Wen, Yue Zhang, Xingyue Qian, Jianli Zhang, Rudan Hu, Xuemin Hu, Xin Wang, Junwu Zhu
The hierarchical nanostructures with heteroatom-doping have been considered as an important factor in electrode materials for advanced supercapacitors. Herein, with the aid of carbon, N and S co-doped Ni0.75Co0.25(CO3)0.125(OH)2/C (NSH) with hierarchical structure was synthesized through a facile one-step hydrothermal method. Notably, it is the first report on carbon precursor as structure inducer for designing a three-dimensional (3D) carnation-like hierarchical structure. Thanks to the carbon induction effect, and the introduction of N/S dopants, the obtained NSH with 3D architecture exhibits superior performances as electrode materials for supercapacitors...
December 7, 2017: ACS Applied Materials & Interfaces
Zhiqiang Xu, Wei Liu, Yuanyi Yang, Lijuan Sun, Yi Deng, Li Liao
In this work, we developed an eco-friendly strategy for preparing Co3O4 nanowires. The process consisted of two steps: controllable synthesis of metal cobalt nanowires followed by a facile air-oxidization step. The 1D nanowire structure with a high aspect ratio was easily achieved via a magnetic-field-assisted self-assembly of cobalt ion complexes during reduction. After air-calcinations, the Co3O4 nanowires were prepared in large scale and ready to be used as the anode material for lithium-ion batteries. The Co3O4 nanowires, which possessed a length ranging from 3 to 8 μm with the aspect ratio more than 15, exhibited a reversible lithium storage capacity up to ~ 790 mAh/g when using a small amount of defect-free graphene flakes as conductive additives...
December 6, 2017: Nanoscale Research Letters
Annelise Y Mah, Armin Rashidi, Molly P Keppel, Nermina Saucier, Emily K Moore, Joshua B Alinger, Sandeep K Tripathy, Sandeep K Agarwal, Emily K Jeng, Hing C Wong, Jeffrey S Miller, Todd A Fehniger, Emily M Mace, Anthony R French, Megan A Cooper
NK cell activation has been shown to be metabolically regulated in vitro; however, the role of metabolism during in vivo NK cell responses to infection is unknown. We examined the role of glycolysis in NK cell function during murine cytomegalovirus (MCMV) infection and the ability of IL-15 to prime NK cells during CMV infection. The glucose metabolism inhibitor 2-deoxy-ᴅ-glucose (2DG) impaired both mouse and human NK cell cytotoxicity following priming in vitro. Similarly, MCMV-infected mice treated with 2DG had impaired clearance of NK-specific targets in vivo, which was associated with higher viral burden and susceptibility to infection on the C57BL/6 background...
December 7, 2017: JCI Insight
Quanning Ma, Qianyu Zhuang, Jun Liang, Zhonghua Zhang, Jing Liu, Hongrui Peng, Changming Mao, Guicun Li
The 3D flowerlike iron sulfide (F-FeS) is successfully synthesized via a facile one-step sulfurization process, and the electrochemical properties as anode materials for lithium ion batteries (LIBs) are investigated. Compared with bulk iron sulfide, we find that the unique structural features, overall flowerlike structure, composed of several dozen nanopetals and numerous small size iron sulfide particles embedded within the fine nanopetals, and hierarchical pore structure features provide signification improvements in lithium storage performance, with a high-rate discharge capacity of 779...
December 6, 2017: Nanomaterials
Tae-Yeon Yu, Jang-Yeon Hwang, Doron Aurbach, Yang-Kook Sun
P2-type layered oxides have been considered promising candidates as cathodes for sodium-ion batteries owing to their high capacity and high rate capability. However, due to the difficulty involved in forming hierarchical microstructures, it remains challenging to develop high energy density P2-type layered oxides with good electrochemical performance and high electrode density. In this study, we demonstrate the feasibility of P2-type Na0.65[Ni0.17Co0.11Mn0.72]O2 as a very efficient cathode material for high energy density sodium-ion batteries by synthesizing a micron-sized hierarchical structure via the co-precipitation route...
December 6, 2017: ACS Applied Materials & Interfaces
Amaia Iturrondobeitia, Aintzane Goñi, Izaskun Gil de Muro, Luis Lezama, Teófilo Rojo
Nanoparticulate NiO and NiO/C composites with different carbon proportions have been prepared for anode application in lithium and sodium ion batteries. Structural characterization demonstrated the presence of metallic Ni in the composites. Morphological study revealed that the NiO and Ni nanoparticles were well dispersed in the matrix of amorphous carbon. The electrochemical study showed that the lithium ion batteries (LIBs), containing composites with carbon, have promising electrochemical performances, delivering specific discharge capacities of 550 mAh/g after operating for 100 cycles at 1C...
December 2, 2017: Nanomaterials
Satyajit Phadke, Mingli Cao, Meriem Anouti
Organic materials such as polyanthraquinone sulphide (PAQS) are receiving increased attention as electrodes for energy storage systems due to their good environmental compatibility, high rate capability and large charge storage capacity. However, one of their limits is the solubility in organic solvents composing the electrolytes. In this study, solubility of PAQS has been tested in 17 different solvents using UV-vis spectroscopy. Results show that PAQS exhibits a very wide range of solubility according to the nature of solvent and the obtained trend agrees well with the predictions from Hansen solubility analysis...
December 4, 2017: ChemSusChem
Qin-Chao Wang, Enyuan Hu, Yang Pan, Na Xiao, Fan Hong, Zheng-Wen Fu, Xiao-Jing Wu, Seong-Min Bak, Xiao-Qing Yang, Yong-Ning Zhou
Developing sodium-ion batteries for large-scale energy storage applications is facing big challenges of the lack of high-performance cathode materials. Here, a series of new cathode materials Na0.66Co x Mn0.66-x Ti0.34O2 for sodium-ion batteries are designed and synthesized aiming to reduce transition metal-ion ordering, charge ordering, as well as Na+ and vacancy ordering. An interesting structure change of Na0.66Co x Mn0.66-x Ti0.34O2 from orthorhombic to hexagonal is revealed when Co content increases from x = 0 to 0...
November 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Na Li, Yi Du, Qing-Ping Feng, Gui-Wen Huang, Hong-Mei Xiao, Shao-Yun Fu
The sharp proliferation of high power electronics and electrical vehicles has promoted growing demands for power sources with simultaneous performances of high energy and power densities. Under the circumstances, battery-supercapacitor hybrid devices are attracting considerable attention as they combine the advantages of both batteries and supercapacitors. Here, a novel type of hybrid device based on carbon skeleton / Mg2Ni free-standing electrode without the traditional nickel foam current collector is reported, which has been designed and fabricated through a dispersing-freeze drying method by employing the reduced graphene oxide (rGO) and multi-walled carbon nanotubes (MWCNTs) as hybrid skeleton...
December 4, 2017: ACS Applied Materials & Interfaces
Bing Sun, Habtom Desta Asfaw, David Rehnlund, Jonas Mindemark, Leif Nyholm, Kristina Edstrom, Daniel Brandell
3D-microbatteries (3D-MBs) impose new demands for the selection, fabrication and compatibility of the different battery components. Herein, solid polymer electrolytes (SPEs) based on poly(trimethylene carbonate) (PTMC) have been implemented in 3D-MB systems. 3D electrodes of two different architectures, LiFePO4-coated carbon foams and Cu2O-coated Cu nanopillars, have been coated with SPEs and used in Li-cells. Functionalized PTMC with hydroxyl end groups was found to enable uniform and well-covering coatings on LiFePO4-coated carbon foams, which was difficult to achieve for non-functionalized polymers, but the cell cycling performance was limited...
December 4, 2017: ACS Applied Materials & Interfaces
Mingdeng Wei, Lingxin Zeng, Renpin Liu, Lei Han, Fenqiang Luo, Xi Chen, Jianbiao Wang, Qingrong Qian, Qinghua Chen
In this work, the Si/SiO2-ordered mesoporous carbon nanocomposite (Si/SiO2-OMC) was initially fabricated through the magnesiothermic reduction strategy using two-dimensional bicontinuous mesochannel of SiO2-OMC as a precursor, combined with NaOH etching process, where crystal Si/amorphous SiO2 nanoparticles were encapsulated into OMC matrix. Such unique porous crystal Si/amorphous SiO2 nanoparticles uniformly dispersed in OMC matrix can not only mitigate the volume change of active materials during cycling process, but also improve electrical conductivity of Si/SiO2 and facilitate the Li+/Na+ diffusion...
November 30, 2017: Chemistry: a European Journal
Hongen Wang, Xu Zhao, Kaili Yin, Yu Li, Lihua Chen, Xiao-Yu Yang, WenJun Zhang, Bao-Lian Su, Guozhong Cao
Vanadium oxides are promising anode materials for lithium ion batteries (LIBs) due to their high capacity, good safety and low cost. However, their practical application has been deferred by the poor rate capability and cycling stability. In this work, we report the designed synthesis of porous V2O3/VO2@carbon heterostructure electrode for high performance LIBs. The synergic effects of porous nanostructures, phase hybridization with self-building electric field at heterointerface, and conductive carbon implantation effectively enhance the electronic/ionic conduction and buffer the volume variation in the composite material...
December 1, 2017: ACS Applied Materials & Interfaces
Oana Carja, Julia L MacIsaac, Sarah M Mah, Brenna M Henn, Michael S Kobor, Marcus W Feldman, Hunter B Fraser
DNA methylation is an epigenetic modification, influenced by both genetic and environmental variation, that plays a key role in transcriptional regulation and many organismal phenotypes. Although patterns of DNA methylation have been shown to differ between human populations, it remains to be determined how epigenetic diversity relates to the patterns of genetic and gene expression variation at a global scale. Here we measured DNA methylation at 485,000 CpG sites in five diverse human populations, and analysed these data together with genome-wide genotype and gene expression data...
October 2017: Nature Ecology & Evolution
Lianbo Ma, Hao Yuan, Wenjun Zhang, Guoyin Zhu, Yanrong Wang, Yi Hu, Peiyang Zhao, Renpeng Chen, Tao Chen, Jie Liu, Zheng Hu, Zhong Jin
Lithium-sulfur (Li-S) batteries hold great promise for the applications of high energy density storage. However, the performances of Li-S batteries are restricted by the low electrical conductivity of sulfur and shuttle effect of intermediate polysulfides. Moreover, the areal loading weights of sulfur in previous studies are usually low (around 1-3 mg cm-2), thus cannot fulfill the requirement for practical deployment. Herein, we report that porous-shell vanadium nitride nanobubbles (VN-NBs) can serve as efficient sulfur host in Li-S batteries, exhibiting remarkable electrochemical performances even with ultrahigh areal sulfur loading weights (5...
November 28, 2017: Nano Letters
Yuliang Li, Hong Shang, Zicheng Zuo, Liang Li, Fan Wang, Huibiao Liu, Yongjun Li
Here, we first report the method for scalably preparing high-quality graphdiyne nanotubes and ultrathin graphdiyne nanosheets (average thickness: ca. 1.9 nm) using Cu nanowires as catalyst. For storing the Li +, the graphdiyne nanostructures show a high capacity of 1388 mAh/g and high rate performance (870 mA h g-1 at 10 A g-1, and 449.8 mA h g-1 at 20 A g-1) with robust stability, demonstrating outstanding overall potential for its applications.
November 27, 2017: Angewandte Chemie
Da Wang, Xiangwen Gao, Yuhui Chen, Liyu Jin, Christian Kuss, Peter G Bruce
There is considerable interest in multivalent cation batteries, such as those based on magnesium, calcium or aluminium. Most attention has focused on magnesium. In all cases the metal anode represents a significant challenge. Recent work has shown that calcium can be plated and stripped, but only at elevated temperatures, 75 to 100 °C, with small capacities, typically 0.165 mAh cm-2, and accompanied by significant side reactions. Here we demonstrate that calcium can be plated and stripped at room temperature with capacities of 1 mAh cm-2 at a rate of 1 mA cm-2, with low polarization (∼100 mV) and in excess of 50 cycles...
November 27, 2017: Nature Materials
Ki Ro Yoon, Kihyun Shin, Jiwon Park, Su-Ho Cho, Chanhoon Kim, Ji-Won Jung, Jun Young Cheong, Hye Ryung Byon, Hyuck Mo Lee, Il-Doo Kim
To achieve a high reversibility and long cycle life for lithium-oxygen (Li-O2) batteries, the irreversible formation of Li2O2, inevitable side reactions, and low conductivity of cathodes should be overcome. Here, we report a rational design of air cathode using a cobalt nitride (Co4N) functionalized carbon nanofiber (CNF) membrane as flexible current collector-catalyst integrated air cathode. Brush-like Co4N nanorods are uniformly anchored on conductive N-doped CNF mats via hydrothermal growth of Co(OH)F nanorods followed by nitridation step...
November 27, 2017: ACS Nano
Lei Zhong, Kai Yang, Ruiteng Guan, Liangbin Wang, Shuanjin Wang, Dongmei Han, Min Xiao, Yuezhong Meng
Rechargeable lithium-sulfur (Li-S) batteries have been expected for new-generation electrical energy storages, which are attributed to their high theoretical energy density, cost effectiveness and eco-friendliness. But Li-S batteries still have some problems for practical application, such as low sulfur utilization and dissatisfactory capacity retention. Herein, we designed and fabricated a foldable and compositionally heterogeneous three-dimensional sulfur cathode with integrated sandwich structure. The electrical conductivity of the cathode is facilitated by three different dimension carbons, in which short-distance and long-distance pathways for electrons are provided by zero-dimensional ketjen black (KB), one-dimensional activated carbon fiber (ACF) and two-dimensional graphene (G)...
November 27, 2017: ACS Applied Materials & Interfaces
Huan Yang, Jiyun Park, Chang-Soo Kim, Yi-Han Xu, Hui-Ling Zhu, Yong-Xin Qi, Longwei Yin, Hui Li, Ning Lun, Yu-Jun Bai
Poor ionic and electronic conductivities are the key issues to affect the electrochemical performance of Li2ZnTi3O8 (LZTO). In view of the water solubility, low melting point, good electrical conductivity, and wettability to LZTO, Na2MoO4 (NMO) was firstly selected to modify LZTO via simply mixing LZTO in NMO water solution followed by calcining the dried mixture at 750 °C for 5 h. The electrochemical performance of LZTO could be enhanced by adjusting the content of NMO, and the modified LZTO with 2 wt% NMO exhibited the most excellent rate capabilities (achieving lithiation capacities of 225...
November 27, 2017: ACS Applied Materials & Interfaces
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