Read by QxMD icon Read


Bakhtiar Azadbakht, Hossein Afarideh, Mohammad Ghannadi-Maragheh, Mehdi Asgari, Ali Bahrami-Samani
In this study, a simple electrochemical procedure adaptable for using low specific activity (188)W for separation and purification of (188)Re from (188)W to obtain no carrier added (NCA) (188)Re is developed. The electrochemical parameters were optimized to maximize the (188)Re electrodeposition yield with minimal (188)W contamination. Two cycle electrolysis procedure was developed. The first electrochemical cell was used for separation of (188)Re and in the second electrochemical cell, separation and purification of (188)Re with >90% deposition yield of (188)Re and minimal contamination of (188)W (<10(-4)%) was achieved...
September 28, 2016: Applied Radiation and Isotopes
Nongnuch Artrith, Wutthigrai Sailuam, Sukit Limpijumnong, Alexie M Kolpak
Water electrolysis is a key technology for the replacement of fossil fuels by environmentally friendly alternatives, but state-of-the-art water oxidation catalysts rely on rare elements such as Pt groups and other noble metals. In this article, we employ first-principles calculations to explore the potential of modified barium titanate (BaTiO3), an inexpensive perovskite oxide that can be synthesized from earth-abundant precursors, for the design of efficient water oxidation electrocatalysts. Our calculations identify Fe and Ni doping as a means to improve the electrical conductivity and to reduce the overpotential required for water oxidation over BaTiO3...
October 17, 2016: Physical Chemistry Chemical Physics: PCCP
Jialei Du, Jianying Wang, Lvlv Ji, Xiaoxiang Xu, Zuofeng Chen
Although significant progress has been made recently, copper-based materials had long been considered to be ineffective catalysts toward hydrogen evolution reaction (HER), in most cases, requiring high overpotentials more than 300 mV. We report here that a Cu(0)-based nanoparticle film electrodeposited in situ from a Cu(II) oxime complex can act as a highly active and robust HER electrocatalyst in neutral phosphate buffer solution. The as-prepared nanoparticle film is of poor crystallization, which incorporates significant amounts of oxime ligand residues and buffer anions PO43-...
October 17, 2016: ACS Applied Materials & Interfaces
Heng Lin, Nihal Oturan, Jie Wu, Virender K Sharma, Hui Zhang, Mehmet A Oturan
The degradation and mineralization of aspartame (ASP) in aqueous solution were investigated, for the first time, by electrochemical advanced oxidation processes (EAOPs) in which hydroxyl radicals were formed concomitantly in the bulk from Fenton reaction via in situ electrogenerated Fenton's reagent and at the anode surface from the water oxidation. Experiments were performed in an undivided cylindrical glass cell with a carbon-felt cathode and a Pt or boron-doped diamond (BDD) anode. The effect of Fe(2+) concentration and applied current on the degradation and mineralization kinetics of ASP was evaluated...
October 8, 2016: Chemosphere
Frank Tambornino, Jonathan Sappl, Felix Pultar, Trung Minh Cong, Sabine Hübner, Tobias Giftthaler, Constantin Hoch
Isothermal electrolysis is a convenient preparation technique for a large number of intermetallic phases. A solution of the salt of a less-noble metal is electrolyzed on a cathode consisting of a liquid metal or intermetallic system. This yields crystalline products at mild reaction conditions in a few hours. We show the aptness and the limitations of this approach. First, we give an introduction into the relevance of electrolytic synthesis for chemistry. Then we present materials and techniques our group has developed for electrocrystallization that are useful for electrochemical syntheses in general...
October 10, 2016: Inorganic Chemistry
Sean R German, Martin A Edwards, Qianjin Chen, Yuwen Liu, Long Luo, Henry S White
In this article, we address the fundamental question: "What is the critical size of a single cluster of gas molecules that grows and becomes a stable (or continuously growing) gas bubble during gas evolving reactions?" Electrochemical reactions that produce dissolved gas molecules are ubiquitous in electrochemical technologies, e.g., water electrolysis, photoelectrochemistry, chlorine production, corrosion, and often lead to the formation of gaseous bubbles. Herein, we demonstrate that electrochemical measurements of the dissolved gas concentration, at the instant prior to nucleation of an individual nanobubble of H2, N2, or O2 at a Pt nanodisk electrode, can be analyzed using classical thermodynamic relationships (Henry's law and the Young-Laplace equation - including non-ideal corrections) to provide an estimate of the size of the gas bubble nucleus that grows into a stable bubble...
September 14, 2016: Faraday Discussions
Suzanne E Witt, Travis A White, Zhanyong Li, Kim R Dunbar, Claudia Turro
Two formamidinate bridged dirhodium(ii,ii) complexes with chelating diimine ligands L, [Rh2(μ-DTolF)2(L)2](2+), were shown to electrocatalytically reduce CO2 in the presence of H2O. Analysis of the reaction mixture and headspace following bulk electrolysis revealed H2 and HCOOH as the major products. The variation in relative product formation is discussed.
October 6, 2016: Chemical Communications: Chem Comm
Deborah J Lomax, Pallav Kant, Aled T Williams, Hollie V Patten, Yuqin Zou, Anne Juel, Robert A W Dryfe
The control of wetting behaviour underpins a variety of important applications from lubrication to microdroplet manipulation. Electrowetting is a powerful method to achieve external wetting control, by exploiting the potential-dependence of the liquid contact angle with respect to a solid substrate. Addition of a dielectric film to the surface of the substrate, which insulates the electrode from the liquid thereby suppressing electrolysis, has led to technological advances such as variable focal-length liquid lenses, electronic paper and the actuation of droplets in lab-on-a-chip devices...
October 5, 2016: Soft Matter
Amina Ledjeri, Idris Yahiaoui, Farida Aissani-Benissad
The removal of tetracycline (TC) by electro/Fe(3+)/peroxydisulfate process combined to the biological treatment is reported in this study. Effect of current density, peroxydisulfate (PDS) concentration, Fe(3+) ions concentration and initial tetracycline concentration were investigated. The results indicated that the removal efficiency of TC increased with increasing current density and decreases with tetracycline initial concentration. This effect is attributed to the competition of TC and electrogenerated intermediate compounds for the consumption of oxidizing SO4(-) radicals...
October 6, 2016: Journal of Environmental Management
Severin Foit, Rüdiger-A Eichel, Izaak C Vinke, Lambertus G J de Haart
Power-to-X concepts promise a significant reduction of greenhouse gas emissions and simultaneously guaranteeing a safe energy supply even at high share of renewable power generation, thus becoming a cornerstone of a sustainable energy system. Power-to-Syngas, i.e. the electrochemical conversion of steam and carbon dioxide with the use of renewably generated electricity to syngas for the production of synfuels and high-value chemicals, offers an efficient technology to couple different energy-intense sectors, such as 'traffic and transportation' and 'chemical industry'...
October 7, 2016: Angewandte Chemie
Remya Narayanan, Meaghan McKinnon, Blake R Reed, Ken T Ngo, Stanislav Groysman, Jonathan Rochford
The electrochemical properties of two Ni(NNN)X2 pincer complexes are reported where X = Cl or Br and NNN is N,N'-(2,6-diisopropylphenyl)bis-aldiminopyridine. Cyclic voltammetry under 1 atm of CO2 suggests electrocatalytic CO2 reduction activity, however, bulk electrolysis shows a poor Faradaic efficiency for CO evolution with a high Faradaic yield for H2 evolution.
October 4, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Danka D Aćimović, Slavko D Karić, Željka M Nikolić, Tanja P Brdarić, Gvozden S Tasić, Milica P Marčeta Kaninski, Vladimir M Nikolić
Polycyclic aromatic hydrocarbons (PAH) have been listed by the United States Environmental Protection Agency (US EPA) and by the European Community as priority environmental pollutants. The removal of PAHs from soils, sediments and waste water has attracted attention of scientists and engineers for several decades. Electrochemical oxidation of PAH compounds in water, is receiving increasing attention, due to its convenience and simplicity. In this study we performed electrochemical oxidation of 16 EPA PAHs mixture in 10% NaCl aqueous solution in potentiostatic conditions, at voltage 1 V...
September 30, 2016: Environmental Pollution
K Tennakone
Contact electrification of chloride-impregnated martian regolith particles due to eolian agitation and moisture condensation on coalesced oppositely charged grains may lead to spontaneous electrolysis that generates hypochlorite, chlorite, chlorate, and perchlorate with a concomitant reduction of water to hydrogen. This process is not curtailed even if moisture condenses as ice because chloride ionizes on the surface of ice. Limitations dictated by potentials needed for electrolysis and breakdown electric fields enable estimation of the required regolith grain size...
October 2016: Astrobiology
Ben Chen, Xiaofei Tian, Lian Yu, Zhenqiang Wu
No abstract text is available yet for this article.
December 2016: Bioprocess and Biosystems Engineering
Mark Burgess, Jeffrey S Moore, Joaquín Rodríguez-López
It is an exciting time for exploring the synergism between the chemical and dimensional properties of redox nanomaterials for addressing the manifold performance demands faced by energy storage technologies. The call for widespread adoption of alternative energy sources requires the combination of emerging chemical concepts with redesigned battery formats. Our groups are interested in the development and implementation of a new strategy for nonaqueous flow batteries (NRFBs) for grid energy storage. Our motivation is to solve major challenges in NRFBs, such as the lack of membranes that simultaneously allow fast ion transport while minimizing redox active species crossover between anolyte (negative electrolyte) and catholyte (positive electrolyte) compartments...
September 27, 2016: Accounts of Chemical Research
Galina Marzun, Alexander Levish, Viktor Mackert, Tanja Kallio, Stephan Barcikowski, Philipp Wagener
Platinum and iridium are rare and expensive noble metals that are used as catalysts for different sectors including in heterogeneous chemical automotive emission catalysis and electrochemical energy conversion. Nickel and its alloys are promising materials to substitute noble metals. Nickel based materials are cost-effective with good availability and show comparable catalytic performances. The nickel-molybdenum system is a very interesting alternative to platinum in water electrolysis. We produced ligand-free nickel-molybdenum nanoparticles by laser ablation in water and acetone...
September 9, 2016: Journal of Colloid and Interface Science
Marc Sugnaux, Manuel Happe, Christian Pierre Cachelin, Olivier Gloriod, Gérald Huguenin, Maxime Blatter, Fabian Fischer
Ethanol, electricity, hydrogen and methane were produced in a two stage bioethanol refinery setup based on a 10L microbial fuel cell (MFC) and a 33L microbial electrolysis cell (MEC). The MFC was a triple stack for ethanol and electricity co-generation. The stack configuration produced more ethanol with faster glucose consumption the higher the stack potential. Under electrolytic conditions ethanol productivity outperformed standard conditions and reached 96.3% of the theoretically best case. At lower external loads currents and working potentials oscillated in a self-synchronized manner over all three MFC units in the stack...
December 2016: Bioresource Technology
Pengtang Wang, Kezhu Jiang, Gongming Wang, Jianlin Yao, Xiaoqing Huang
The design of high-performance electrocatalysts for the alkaline hydrogen evolution reaction (HER) is highly desirable for the development of alkaline water electrolysis. Phase- and interface-engineered platinum-nickel nanowires (Pt-Ni NWs) are highly efficient electrocatalysts for alkaline HER. The phase and interface engineering is achieved by simply annealing the pristine Pt-Ni NWs under a controlled atmosphere. Impressively, the newly generated nanomaterials exhibit superior activity for the alkaline HER, outperforming the pristine Pt-Ni NWs and commercial Pt/C, and also represent the best alkaline HER catalysts to date...
October 4, 2016: Angewandte Chemie
Elena C Montoto, Gavvalapalli Nagarjuna, Jingshu Hui, Mark Burgess, Nina M Sekerak, Kenneth Hernández-Burgos, Teng-Sing Wei, Marissa Kneer, Joshua Grolman, Kevin J Cheng, Jennifer A Lewis, Jeffrey S Moore, Joaquín Rodríguez-López
Versatile and readily available battery materials compatible with a range of electrode configurations and cell designs are desirable for renewable energy storage. Here we report a promising class of materials based on redox active colloids (RACs) that are inherently modular in their design and overcome challenges faced by small-molecule organic materials for battery applications, such as crossover and chemical/morphological stability. RACs are cross-linked polymer spheres, synthesized with uniform diameters between 80 and 800 nm, and exhibit reversible redox activity as single particles, as monolayer films, and in the form of flowable dispersions...
October 12, 2016: Journal of the American Chemical Society
Xianchan Li, Johan Dunevall, Andrew G Ewing
Electrochemical cytometry adds a new dimension to our ability to study the chemistry and chemical storage of transmitter molecules stored in nanometer vesicles. The approach involves the adsorption and subsequent rupture of vesicles on an electrode surface during which the electroactive contents are quantitatively oxidized (or reduced). The measured current allows us to count the number of molecules in the vesicles using Faraday's law and to correlate this to the amount of molecules released when single exocytosis events take place at communicating cells...
October 18, 2016: Accounts of Chemical Research
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"