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Lei Zhou, Dandan Deng, Yichi Zhang, Wen Zhou, Yujing Jiang, Ying Liu
A new facultative anaerobic exoelectrogenic strain LZ-1, belonging to Citrobacter freundii, has been isolated. This strain can produce current densities of 843.9 and 865.6μAcm(-2) using citrate or acetate as carbon source in a three-electrode configuration. The electricity generation performance was also analyzed in a dual-chamber MFC system, reaching a maximum power density of 1233mWm(-2). In addition to acetate and citrate, other carbon sources such as pyruvate, formate, acetate, citrate and fumarate could also be utilized to produce current by strain LZ-1...
November 27, 2016: Biosensors & Bioelectronics
Enrico Mugnaioli, Mauro Gemmi, Marco Merlini, Michele Gregorkiewitz
(Nax□1 - x)5[MnO2]13 has been synthesized with x = 0.80 (4), corresponding to Na0.31[MnO2]. This well known material is usually cited as Na0.4[MnO2] and is believed to have a romanèchite-like framework. Here, its true structure is determined, ab initio, by single-crystal electron diffraction tomography (EDT) and refined both by EDT data applying dynamical scattering theory and by the Rietveld method based on synchrotron powder diffraction data (χ(2) = 0.690, Rwp = 0.051, Rp = 0.037, RF2 = 0.035). The unit cell is monoclinic C2/m, a = 22...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
Ievgen I Nedrygailov, Changhwan Lee, Song Yi Moon, Hyosun Lee, Jeong Young Park
Understanding the role of electronically nonadiabatic interactions during chemical reactions on metal surfaces in liquid media is of great importance for a variety of applications including catalysis, electrochemistry, and environmental science. Here, we report the design of an experimental apparatus for detection of the highly excited (hot) electrons created as a result of nonadiabatic energy transfer during the catalytic decomposition of hydrogen peroxide on thin-film metal-semiconductor nanodiodes. The apparatus enables the measurement of hot electron flows and related phenomena (e...
November 2016: Review of Scientific Instruments
David Mecerreyes, Iñaki Gomez, Alberto Blazquez, Olatz Leonet
Lithium sufur batteries are among the most promising next generation battery systems due to the high capacity properties of sulfur as cathodic material. Beyond its interesting intrinsic properties, sulfur possesses a very low conductivity and complex electrochemistry which involves the high solubility of the lithium sulfides in the electrolyte. These two characteristics trigger a series of limitations on its performance as active cathode material which leads to batteries with low cyclability. Recently, inverse vulcanizated sulfur has shown to retain capacity far better than elemental sulfur leading to batteries with excellent cyclability...
December 2, 2016: ChemSusChem
Bingrong Wang, Yang Cao, Yong Chen, Xiaoyong Lai, Juan Peng, Jinchun Tu, Xiaotian Li
NiCo2O4 nanospheres, a type of conjugated reduced graphene oxide (rGO), are compounded by a simple and easy synthesis of Cu2O/GO and fabricated NiCo2O4/rGO nanocomposites based on a Cu2O/GO template. The structure and morphology of the hierarchical NiCo2O4/rGO are characterized by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The electrochemistry properties of NiCo2O4/rGO composites toward glucose are determined based on a glassy carbon electrode, and the results indicate that the hollow nanospheres of NiCo2O4/rGO could achieve high-sensitivity detections of glucose...
December 1, 2016: Nanotechnology
Tim Albrecht, Julie MacPherson, Olaf Magnussen, David Fermin, Richard Crooks, Justin Gooding, Thom Hersbach, Frederic Kanoufi, Wolfgang Schuhmann, Cameron Bentley, Nongjian Tao, Sushanta Mitra, Katharina Krischer, Kristina Tschulik, Sanli Faez, Wojciech Nogala, Patrick Unwin, Yitao Long, Marc Koper, Zhongqun Tian, Mario A Alpuche-Aviles, Henry White, Vitor Brasiliense, Christine Kranz, Wolfgang Schmickler, Keith Stevenson, Chao Jing, Martin Edwards
No abstract text is available yet for this article.
November 28, 2016: Faraday Discussions
Justin Gooding, Olaf Magnussen, David Fermin, Richard Crooks, Frederic Kanoufi, Wolfgang Schuhmann, Richard Nichols, Wolfgang Schmickler, Nongjian Tao, Shengli Chen, Paolo Actis, Ashley Page, Kristina Tschulik, Sanli Faez, Martin Edwards, Robert Johnson, Wojciech Nogala, Christine Kranz, Michael Eikerling, Patrick Unwin, Bradley Thomas, Venkateshkumar Prabhakaran, Jan Clausmeyer, Kylie Vincent, Marc Koper, Zhongqun Tian, Andy Mount, Mario A Alpuche-Aviles, Henry White, Andrew Ewing, Simon Higgins, Lane Baker, Dongping Zhan, Jens Ulstrup, Paul W Bohn, Serge Lemay
No abstract text is available yet for this article.
November 28, 2016: Faraday Discussions
Joshua C Treacher, Stephen M Wood, M Saiful Islam, Emma Kendrick
The importance of developing new low-cost and safe cathodes for large-scale sodium batteries has led to recent interest in silicate compounds. A novel cobalt orthosilicate, Na2CoSiO4, shows promise as a high voltage (3.3 V vs. Na/Na(+)) cathode material for sodium-ion batteries. Here, the synthesis and room temperature electrochemical performance of Na2CoSiO4 have been investigated with the compound found to yield a reversible capacity greater than 100 mA h g(-1) at a rate of 5 mA g(-1). Insights into the crystal structures of Na2CoSiO4 were obtained through refinement of structural models for its two polymorphs, Pn and Pbca...
November 23, 2016: Physical Chemistry Chemical Physics: PCCP
Jan Luxa, Yong Wang, Zdenek Sofer, Martin Pumera
A(III) B(VI) chalcogenides are an interesting group of layered semiconductors with several attractive properties, such as tunable band gaps and the formation of solid solutions. Unlike the typically sandwiched structure of transition-metal dichalcogenides, A(III) B(VI) layered chalcogenides with hexagonal symmetry are stacked through the X-M-M-X motif, in which M is gallium and indium, and X is sulfur, selenium, and tellurium. In view of the inadequate study of the electrochemical properties and great interest in layered materials towards energy-related research, herein the inherent electrochemistry of GaS, GaSe, GaTe, and InSe has been studied, as well as the exploration of their potential as hydrogen evolution reaction (HER) electrocatalysts...
November 16, 2016: Chemistry: a European Journal
Guohui Zhang, Sze-Yin Tan, Anisha N Patel, Patrick R Unwin
The electrochemistry of the Fe(3+/2+) redox couple has been studied on highly oriented pyrolytic graphite (HOPG) samples that differ in step edge density by 2 orders of magnitude, to elucidate the effect of surface structure on the electron transfer (ET) kinetics. Macroscopic cyclic voltammetry measurements in a droplet-cell arrangement, highlight that the Fe(3+/2+) process is characterised by slow ET kinetics on HOPG and that step edge coverage has little effect on the electrochemistry of Fe(3+/2+). A standard heterogeneous ET rate constant of ∼5 × 10(-5) cm s(-1) for freshly cleaved HOPG was derived from simulation of the experimental results, which fell into the range of the values reported for metal electrodes, e...
November 30, 2016: Physical Chemistry Chemical Physics: PCCP
Paolo Actis, Cameron L Bentley, Martin A Edwards, Leon Jacobse
No abstract text is available yet for this article.
November 17, 2016: Chemical Communications: Chem Comm
M Bartošík, E Ondroušková
Cytosine methylation in DNA is an epigenetic mechanism regulating gene expression and plays a vital role in cell differentiation or proliferation. Tumor cells often exhibit aberrant DNA methylation, e.g. hypermethylation of tumor suppressor gene promoters. New methods, capable of determining methylation status of specific DNA sequences, are thus being developed. Among them, MS-HRM (methylation-specific high resolution melting) and electrochemistry offer relatively inexpensive instrumentation, fast assay times and possibility of screening multiple samples/DNA regions simultaneously...
2016: Klinická Onkologie: Casopis Ceské a Slovenské Onkologické Spolecnosti
Philippe Negrel, Patrick Ollivier, Christine Flehoc, Daniel Hube
The identification of the sources of contaminants present in groundwater at industrial sites is primordial to address environmental and industrial issues. However, available tools are often inadequate or expensive. Here, we present the data of stable isotopes (δ(18)O and δ(2)H) of the water molecule at an industrial site where electrochemistry plant occurs impacting the groundwater quality. High ClO3 and ClO4 contents and (2)H enrichment have been measured in groundwater. Recharge of aquifer relates to infiltration of rainwater and by subsurface inflow...
November 8, 2016: Science of the Total Environment
Venkateshkumar Prabhakaran, Grant E Johnson, Bingbing Wang, Julia Laskin
Molecular-level understanding of electrochemical processes occurring at electrode-electrolyte interfaces (EEIs) is key to the rational development of high-performance and sustainable electrochemical technologies. This article reports the development and application of solid-state in situ thin-film electrochemical cells to explore redox and catalytic processes occurring at well-defined EEIs generated using soft-landing (SL) of mass- and charge-selected cluster ions. In situ cells with excellent mass-transfer properties are fabricated using carefully designed nanoporous ionic liquid membranes...
November 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
Jing Zhang, Zhao Chen, Lan Yang, Fang-Fang Pan, Guang-Ao Yu, Jun Yin, Sheng Hua Liu
The research efforts on oligoacene systems are still relatively limited mainly due to the synthetic challenge and the extreme instability of longer acenes. Herein, these two issues have been overcome through elaborative modification and the stable pentacene species has been successfully synthesized. Additionally, a series of bis(diarylamino) compounds linked by variable-length oligoacene bridges ranging from one to five fused rings (benzene (1a), naphthalene (1b), anthracene (1c), tetracene (1d) and pentacene (1e)) have been prepared to probe the effect of the extent of π-conjugation on the electron transfer properties...
November 2, 2016: Scientific Reports
Samuel J Hendel, Ambata M Poe, Piyachai Khomein, Youngju Bae, S Thayumanavan, Elizabeth R Young
A complete photophysical characterization of organic molecules designed for use as molecular materials is critical in the design and construction of devices such as organic photovoltaics (OPV). The nature of a molecule's excited state will be altered in molecules employing the same chromophoric units but possessing different molecular architectures. For this reason, we examine the photophysical reactions of two BODIPY-based D-A and A-D-A molecules, where D is the donor and A is the acceptor. A BODIPY (4,4'-difluoro-4-bora-3a,4a-diaza-s-indacene) moiety serves as the A component and is connected through the meso position using a 3-hexylthiophene linker to a N-(2-ethylhexyl)dithieno[3,2-b:2',3'-d]pyrrole (DTP), which serves as the D component...
November 1, 2016: Journal of Physical Chemistry. A
Marco Matteucci, Arto Heiskanen, Kinga Zór, Jenny Emnéus, Rafael Taboryski
We compare ultrasonic welding (UW) and thermal bonding (TB) for the integration of embedded thin-film gold electrodes for electrochemical applications in injection molded (IM) microfluidic chips. The UW bonded chips showed a significantly superior electrochemical performance compared to the ones obtained using TB. Parameters such as metal thickness of electrodes, depth of electrode embedding, delivered power, and height of energy directors (for UW), as well as pressure and temperature (for TB), were systematically studied to evaluate the two bonding methods and requirements for optimal electrochemical performance...
October 27, 2016: Sensors
Prakash Chandra Mondal, Claudio Fontanesi, David H Waldeck, Ron Naaman
Molecular spintronics (spin + electronics), which aims to exploit both the spin degree of freedom and the electron charge in molecular devices, has recently received massive attention. Our recent experiments on molecular spintronics employ chiral molecules which have the unexpected property of acting as spin filters, by way of an effect we call "chiral-induced spin selectivity" (CISS). In this Account, we discuss new types of spin-dependent electrochemistry measurements and their use to probe the spin-dependent charge transport properties of nonmagnetic chiral conductive polymers and biomolecules, such as oligopeptides, L/D cysteine, cytochrome c, bacteriorhodopsin (bR), and oligopeptide-CdSe nanoparticles (NPs) hybrid structures...
October 24, 2016: Accounts of Chemical Research
Mrinmay Mandal, Kerstin Oppelt, Manuela List, Ian Teasdale, Debashis Chakraborty, Uwe Monkowius
ABSTRACT: Four new copper complexes based on bidentate imino phenoxide ligands were synthesized and characterized by IR, UV-Vis spectroscopy, ESI mass spectrometry, single crystal X-ray diffraction, and electrochemistry. The crystal structures revealed that the copper(II) atoms are surrounded by phenolate oxygen and imine nitrogen atoms of two ligands in a distorted square-planar geometry. The existence of ligand-centered, as well as Cu(II)-centered quasi-reversible and reversible redox reactions are observed in the cyclic voltammetry experiments of all the complexes...
2016: Monatshefte Für Chemie
Sebastian Dohm, Eckhard Spohr, Martin Korth
We report the development of adaptive QM/MM computer simulations for electrochemistry, providing public access to all sources via the free and open source software development model. We present a modular workflow-based MD simulation code as a platform for algorithms for partitioning space into different regions, which can be treated at different levels of theory on a per-timestep basis. Currently implemented algorithms focus on targeting molecules and their solvation layers relevant to electrochemistry. Instead of using built-in forcefields and quantum mechanical methods, the code features a universal interface, which allows for extension to a range of external forcefield programs and programs for quantum mechanical calculations, thus enabling the user to readily implement interfaces to those programs...
January 5, 2017: Journal of Computational Chemistry
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