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Xiujuan Wang, Kai Chen, Gang Wang, Xiaojie Liu, Hui Wang
Transition metal phosphides (TMPs) have been extensively investigated owing to their high theoretical capacities and relatively low intercalation potentials vs. Li/Li+, but their practical applications have been hindered by low electrical conductivity and dramatic volume variation during cycling. In this work, an interesting strategy for rational design of graphene (GR) encapsulated with hollow FeP@carbon nanocomposite (H-FeP@C@GR) via a combination of hydrothermal route, carbon coating process, phosphidation treatment, and carbothermic reaction is reported...
October 19, 2017: ACS Nano
Nan Wang, Hancheng Yuan, Yanna Nuli, Jun Yang, Jiulin Wang
The development of rechargeable Mg-based batteries with high energy density is restricted by the high-voltage cathodes and the parasitic side reactions between battery components and electrolytes operating at relatively high potentials. Here, we develop a hybrid Mg2+/Li+ cell using monoclinic or orthorhombic Fe2(MoO4)3 cathode, a Mg anode and a simple (PhMgCl)2-AlCl3+LiCl electrolyte. Hastelloy-C alloy is proposed as a current collector of high-voltage cathode for the hybrid Mg2+/Li+ battery within a Swagelok-type cell...
October 19, 2017: ACS Applied Materials & Interfaces
Qinlai Qian, Yifu Yang, Huixia Shao
The naturally formed solid electrolyte interphase (SEI) of lithium (Li) with organic electrolytes is fragile and can result in repeated exposure of fresh Li metal to the electrolyte during plating/stripping cycles. Building an artificial SEI layer is an effective way to enhance its stability and improve the electrochemical deposition behavior of Li. Using non-Li metal substrate to construct Li metal electrode is a more applicable method than using direct Li metal anode. In this study, the possibility of electrochemical reduction of propylene carbonate (PC) as an artificial SEI formation reaction for Li metal anode was evaluated...
October 19, 2017: Physical Chemistry Chemical Physics: PCCP
Lu-Ping Zhu, Hao Lu, Dong Hao, Lingling Wang, Zihua Wu, Lijun Wang, Peng Li, Jinhua Ye
A novel photoelectrode of three-dimensional (3D) lupinus-like TiO2 nanorod@Sn3O4 nanosheet hierarchical heterostructured arrays (TiO2@Sn3O4 HHAs) on transparent FTO glass substrate was designed and fabricated by a two-step solvothermal growth process. Photoelectrochemical(PEC) measurements showed that 3D lupinus-like TiO2@Sn3O4 HHAs photoelectrode displayed enhanced photocurrent density (3-fold increase with respect to pure TiO2), improved conversion efficiency, more negative onset potential (from -0.13 to -0...
October 19, 2017: ACS Applied Materials & Interfaces
Hans J Schäfer
It's electrifying! Electrochemical cross-coupling of aryl compounds provides a one-step approach to unsymmetrical biaryl compounds. A boron-doped diamond electrode is used as the anode to oxidise the phenolic hydroxy group to a phenoxy radical, and 1,1,1,3,3,3-hexafluoroisopropylalcohol (HFIP) and tetraalkylammonium methylsulfate are used as the solvent and electrolyte. Since no reagents are required, no waste is formed from this source.
October 19, 2017: Angewandte Chemie
Jéssica Alves Nogueira, Hamilton Varela
Polymer electrolyte membrane fuel cells (PEMFC) fed with H2 contaminated with CO may exhibit oscillatory behavior when operated galvanostatically. The self-organization of the anodic overpotential is interesting because it can be accompanied by an increase in the average performance. Herein we report experimental studies of voltage oscillations that emerge in a PEMFC equipped with a Pd/C or PdPt/C anode and fed with H2 contaminated with CO (100 ppm). We used on-line mass spectrometry to investigate how the mass fragments associated with CO2 and CO (m/z 44 and 28, respectively) varied with the voltage oscillations...
October 2017: ChemistryOpen
Erika Moreno, Juan A Gayosso, Jose Ramón Montejano, Georgina Almaguer, Norma Vázquez, Cristino Cruz, Adriana Mercado, Norma A Bobadilla, Gerardo Gamba, Alfredo Sierra, Victoria Ramírez
Geranium seemannii Peyr is a perennial plant endemic in central Mexico that has been widely used for its diuretic effect, but the responsible compound of this effect is unknown as well as the mechanism by which the diuretic effect is achieved. Geraniin is one of the compounds isolated from this kind of geranium. This study was designed to determinate whether geraniin possesses diuretic activity and to elucidate the mechanism of action. Geraniin was extracted and purified from Geranium seemannii Peyr. Male Wistar rats were divided into four groups: 1) Control, 2) 75 mg/kg of geraniin, 3) 20 mg/Kg of furosemide, and 4) 10 mg/Kg of hydrochlorothiazide...
October 18, 2017: American Journal of Physiology. Renal Physiology
Matthew Stephen Palmer, George Heigenhauser, MyLinh Duong, Lawrence L Spriet
This study determined whether ingesting a carbohydrate-electrolyte solution (CES) vs. progressive dehydration affected skeletal muscle glycogen use and performance in ice hockey players during simulated ice hockey exercise comprised of 3 active "periods". Seven males (21.3±0.3 years, 184.7±1.2 cm, 84.2±3.9 kg, and 49.6±1.8 mL·kg(-1)·min(-1)) performed a hockey-specific protocol on two occasions and either dehydrated progressively (NF), or stayed well-hydrated by ingesting a CES. Muscle biopsies were taken at rest, before the 3(rd) period (P3), and after the final sprint in the protocol...
October 18, 2017: International Journal of Sports Medicine
Maria Escudero-Escribano, Anders F Pedersen, Elisa A Paoli, Rasmus Frydendal, Daniel Friebel, Paolo Malacrida, Jan Rossmeisl, Ifan E L Stephens, Ib Chorkendorff
The high precious metal loading and high overpotential of the oxygen evolution reaction (OER) prevents the widespread utilization of polymer electrolyte membrane (PEM) water electrolyzers. Herein we explore the OER activity and stability in acidic electrolyte of a combined IrOx/RuO2 system consisting of RuO2 thin films with sub-monolayer (1, 2 and 4 Å) amounts of IrOx deposited on top. Operando extended X-ray absorption fine structure (EXAFS) on the Ir L-3 edge revealed a rutile type IrO2 structure with some Ir sites occupied by Ru, IrOx being at the surface of the RuO2 thin film...
October 18, 2017: Journal of Physical Chemistry. B
Giuseppe Antonio Elia, Jean-Baptiste Ducros, Dane Sotta, Virginie Delhorbe, Agnès Brun, Krystan Marquardt, Robert Hahn
Herein we report, for the first time, an overall evaluation of commercially available battery separators to be used for aluminum batteries, revealing that most of them are not stable in the highly-reactive 1-ethyl-3-methylimidazolium chloride : aluminum trichloride (EMIMCl:AlCl3) electrolyte conventionally employed in rechargeable aluminum batteries. Subsequently, a novel highly-stable polyacrylonitrile (PAN) separator obtained by the electrospinning technique for application in high-performance aluminum batteries has been prepared...
October 18, 2017: ACS Applied Materials & Interfaces
Minjeong Shin, Heng-Liang Wu, Badri Narayanan, Kimberly A See, Rajeev S Assary, Lingyang Zhu, Richard T Haasch, Shuo Zhang, Zhengcheng Zhang, Larry A Curtiss, Andrew A Gewirth
We evaluate hydrofluoroether (HFE) cosolvents with varying degrees of fluorination in the acetonitrile-based solvate elec-trolyte to determine the effect of HFE structure on the electrochemical performance of the Li-S battery. Solvates or spar-ingly solvating electrolytes are an interesting electrolyte choice for Li-S battery due to their low polysulfide solubility. The solvate electrolyte with stoichiometric ratio of LiTFSI salt in acetonitrile, (MeCN)2-LiTFSI, exhibits limited polysulfide sol-ubility due to the high concentration of LiTFSI...
October 18, 2017: ACS Applied Materials & Interfaces
Ana A Folgueiras-Amador, Kai Philipps, Sebastien Guilbaud, Jarno Poelakker, Thomas Wirth
Flow electrochemistry is an efficient methodology to generate radical intermediates. An electrochemical flow microreactor has been designed and manufactured to improve the efficiency of electrochemical flow reactions. With this device only little or no supporting electrolytes are needed, making processes less costly and enabling easier purification. This is demonstrated by the facile synthesis of amidyl radicals used in intramolecular hydroaminations to isoindolinones. The combination with inline mass spectrometry facilitates a much easier telescoping of chemical steps in a single flow process...
October 17, 2017: Angewandte Chemie
Xiao-Bin Fu, Guang Yang, Jin-Ze Wu, Jianchen Wang, Qun Chen, Yefeng Yao
Fast lithium-ion transportation is found in the crystalline polymer electrolytes, α-CD-PEOn/Li+ (n = 12, 40), prepared by self-assembly of α-cyclodextrin (CD), polyethylene oxide (PEO) and Li+ salts. A detailed solid-state NMR study combined with X-ray diffraction technique reveals the unique structural features of the samples, that is, a) the tunnel structure formed by the assembled CDs, providing the ordered long-range pathway for Li+ ion transportation; b) the all-trans conformational sequence of the PEO chains in the tunnels, attenuating significantly the coordination between Li+ and the EO segments...
October 16, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Heng Li, Dabei Wu, Jin Wu, Li-Ying Dong, Ying-Jie Zhu, Xianluo Hu
Separators play a pivotal role in the electrochemical performance and safety of lithium-ion batteries (LIBs). The commercial microporous polyolefin-based separators often suffer from inferior electrolyte wettability, low thermal stability, and severe safety concerns. Herein, a novel kind of highly flexible and porous separator based on hydroxyapatite nanowires (HAP NWs) with excellent thermal stability, fire resistance, and superior electrolyte wettability is reported. A hierarchical cross-linked network structure forms between HAP NWs and cellulose fibers (CFs) via hybridization, which endows the separator with high flexibility and robust mechanical strength...
October 16, 2017: Advanced Materials
Flávio Jota de Paula, Precil Diego Miranda de Menezes Neves, Ramaiane Aparecida Bridi, Alice Tung Wan Song, Elias David-Neto
Granulicatella and Abiotrophia are genera of fastidious Gram-positive cocci commensal of the oral, genitourinary, and intestinal flora. We report the first case of infective endocarditis caused by Granulicatella sp. in a kidney transplant recipient. A 67-year-old male kidney transplant recipient was admitted to the hospital for investigation of fever, abdominal pain, and diarrhea. On physical examination, he was dehydrated. Laboratory tests identified impaired renal function (creatinine level of 15.5 mg/dl; reference, 3...
July 2017: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
Laryssa Passos Sarmento Santos, Victor Guerreiro Bomfim, Camila Fagundes Bezerra, Natália Vieira Costa, Rafael Barreto Paes de Carvalho, Ricardo Sobral de Carvalho, Rogério da Hora Passos, Olivia Carla Bomfim Boaventura, André Luiz Nunes Gobatto
Granulomatosis with polyangiitis is a rare systemic inflammatory disorder characterized by vasculitis of the small arteries, the arterioles and the capillaries together with necrotizing granulomatous lesions. This case reports on a young female patient, previously diagnosed with granulomatosis with polyangiitis, who was admitted to the intensive care unit with seizures and hemodynamic instability due to a complete atrioventricular heart block. The event was associated with multiple episodes of sustained ventricular tachycardia without any structural heart changes or electrolyte disturbances...
July 2017: Revista Brasileira de Terapia Intensiva
Issam Mjejri, Cara M Doherty, Marta Rubio-Martínez, Glenna L Drisko, Aline Rougier
Devices displaying controllably tunable optical properties through an applied voltage are attractive for smart glass, mirrors and displays. Electrochromic material development aims to decrease power consumption while increasing the variety of attainable colors, their brilliance and their longevity. We report the first electrochromic device constructed from metal organic frameworks (MOFs). Two MOF films, HKUST-1 and ZnMOF74, are assembled so that the oxidation of one corresponds to the reduction of the other, allowing the two sides of the device to simultaneously change color...
October 18, 2017: ACS Applied Materials & Interfaces
Suja Thangaraj, Nagarajan Govindan
The significance of mileage to the fruitful operation of a trucking organization cannot be downplayed. Fuel is one of the biggest variable expenses in a trucking wander. An attempt is made in this research to improve the combustion efficiency of a diesel engine for better fuel economy by introducing hydroxy gas which is also called browns gas or HHO gas in the suction line, without compromising performance and emission. Brown's gas facilitates the air-fuel mixture to ignite faster and efficient combustion. By considering safety and handling issues in automobiles, HHO gas generation by electrolysis of water in the presence of sodium bicarbonate electrolytes (NaHCO3) and usage was explored in this research work over compressed pure hydrogen, due to generation and capacity of immaculate hydrogen as of now confines the application in diesel engine operation...
October 18, 2017: Environmental Science and Pollution Research International
Fuxing Yin, Zhengjun Liu, Shuang Yang, Zhenzhen Shan, Yan Zhao, Yuting Feng, Chengwei Zhang, Zhumabay Bakenov
The aqueous sodium-ion battery (ASIB) is one of the promising new energy storage systems owing to the abundant resources of sodium as well as efficiency and safety of electrolyte. Herein, we report an ASIB system with Na4Mn9O18/carbon nanotube (NMO/CNT) as cathode, metal Zn as anode and a novel Na(+)/Zn(2+) mixed ion as electrolyte. The NMO/CNT with microspherical structure is prepared by a simple spray-drying method. The prepared battery delivers a high reversible specific capacity and stable cyclability. Furthermore, the battery displays a stable reversible discharge capacity of 53...
October 17, 2017: Nanoscale Research Letters
Timothy Plett, Mya Le Thai, Josslyn Cai, Ivan Vlassiouk, Reginald M Penner, Zuzanna S Siwy
Solid and gel electrolytes offer significant advantages for cycle stability and longevity in energy storage technologies. These advantages come with trade-offs such as reduced conductivity and ion mobility, which can impact power density in storage devices even at the nanoscale. Here we propose experiments aimed at exploring the ion transport properties of a hybrid electrolyte system of liquid and gel electrolytes with meso and nanoscale components. We focus on single pore systems featuring LiClO4-propylene carbonate and LiClO4-PMMA gel, which are model electrolytes for energy storage devices...
October 18, 2017: Nanoscale
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