[email protected], [email protected] Abstract In the present study, we examined the effect of adding nickel to Pt-Ru and Pt-Sn catalysts for ethanol electrooxidation. The alcohol-reduction process with ethylene glycol was used to prepare ten electrocatalysts. These were microchemically and physically characterized by EDX and XRD analysis. The electrocatalysts were evaluated at mini-electrodes with cyclic voltammetry at 25 and 50 °C in sulfuric acid and ethanol solutions, and as anodes in fuel cell tests. Nickel addition to Pt-Ru mixtures significantly increased the catalytic activity toward ethanol electrooxidation. For Pt-Ru-Ni catalysts, the current density was around five times greater than all other investigated mixtures. Nickel also duplicated the catalytic activity of the Pt-Sn catalyst. Furthermore ethanol electrooxidation increased with temperature for most catalytic mixtures, and the electrocatalytic activity of mixtures containing nickel, demonstrate a considerable increase ...
The synthesis of a variety of 1-aryl-7-phenylaminoisoquinolinequinones from 1,4-benzoquinone and arylaldehydes via the respective 1-arylisoquinolinequinones is reported. The cyclic voltammograms of the new compounds exhibit two one-electron reduction waves to the corresponding radical-anion and dianion and two quasi-reversible oxidation peaks. The half-wave potential values (EI½) of the members of the series have proven sensitive to the electron-donor effect of the aryl group (phenyl, 2-thienyl, 2-furyl) at the 1-position as well as to the phenylamino groups (anilino, p-anisidino) at the 7-position. The antiproliferative activity of the new compounds was evaluated in vitro using the MTT colorimetric method against one normal cell line (MRC-5 lung fibroblasts) and two human cancer cell lines: AGS human gastric adenocarcinoma and HL-60 human promyelocytic leukemia cells in 72-h drug exposure assays. Among the series, compounds 5a, 5b, 5g, 5h, 6a and 6d exhibited interesting antiproliferative activities
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Electrochemistry is the branch of physical chemistry that studies the relationship between electricity, as a measurable and quantitative phenomenon, and identifiable chemical change, with either electricity considered an outcome of a particular chemical change or vice versa. These reactions involve electric charges moving between electrodes and an electrolyte (or ionic species in a solution). Thus electrochemistry deals with the interaction between electrical energy and chemical change. When a chemical reaction is caused by an externally supplied current, as in electrolysis, or if an electric current is produced by a spontaneous chemical reaction as in a battery, it is called an electrochemical reaction. Chemical reactions where electrons are transferred directly between molecules and/or atoms are called oxidation-reduction or (redox) reactions. In general, electrochemistry describes the overall reactions when individual redox reactions are separate but connected by an external electric circuit ...
Recent reviews of nucleic acids electrochemistry:. E. Palecek, M. Fojta, F. Jelen, and V. Vetterl, Electrochemical analysis of nucleic acids, in The Encyclopedia of Electrochemistry, in Bard, A. J., and Stratsmann, M., (Eds.), Wiley-VCH, Weinheim, 2002, pp. 365-429.. M. Fojta, Electrochemical Sensors for DNA Interactions and Damage, Electroanalysis 14 (2002) 1449-1463.. M. Fojta, Mercury Electrodes in Nucleic Acid Electrochemistry: Sensitive Analytical Tools and Probes of DNA Structure, Collect. Czech. Chem. Commun 69 (2004) 715-747.. E. Palecek, and M. Fojta, Electrochemical DNA Sensors, in Bioelectronics, in Wilner, I., and Katz, E., (Eds.), Wiley VCH, Weinheim, 2005, pp. 127-192.. M. Fojta, Detecting DNA damage with electrodes, in Electrochemistry of nucleic acids and proteins. Towards electrochemical sensors for genomics and proteomics, in Palecek, E., Scheller, F., and Wang, J., (Eds.), Elsevier, Amsterdam, 2005, pp. 386-430.. E. Palecek, and F. Jelen, Electrochemistry of nucleic acids., in ...
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In this article, we derive an approximate asymptotic analytical expression for the long-time chronoamperometric current response at an inlaid microband (or laminar) electrode. The expression is applicable when the length of the microband is much greater than the width, so that the diffusion of the electrochemical species can be regarded as two-dimensional. We extend the previously known result for the diffusion-limited current response (Aoki, K. et al. J. Electroanal. Chem. 1987, 225, 19-32 and Phillips, C.G. J. Electroanal. Chem. 1992, 333, 11-32) to accommodate quasi-reversible reactions and unequal diffusion coefficients of the oxidant and the reductant. Comparison with numerical calculations validates the analytical expression, and we demonstrate that unequal diffusion coefficients can substantially change the current response. Finally, we discuss the form of the long-time current response for a one-step, one-electron redox reaction if the rate constants are modelled in the Butler-Volmer framework,
On-line registration is now open. See you at the Workshop!. With this web form, you can pay for registration for the 2018 Workshop on Electrochemistry by providing an authorized UT account number. We will charge that account directly by interdepartmental transfer (IDT), and you will receive your registration from Eventbrite within 48 hours.. If you prefer to pay with a credit card, please go to http://electrochemistry2018.eventbrite.com/ and register there.. Disclaimer: by providing us with this UT account number you are certifying that you are giving permission to the Center for Electrochemistry to process an interdepartmental transfer of funds (IDT) in the amount of your registration/invoice total.. Note: Please verify the spelling and capitalization of your name, as the information you provide on this form also will be used to print your name badge.. ...
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View Notes - electrochemistry_sk026 from PHYSIC 110 at Alma College. Electrochemistry: Chemical Change and Electrical Work 9.1 Reactions in voltaic/galvanic cells 9.2 Cell potential and Standard
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This work is based on the hypothesis that a combination of dynamic electrochemical methods, in-operando techniques, and simulations is a feasible and advantageous way towards the determination of electrochemical reaction kinetics. To demonstrate advantages of such a combined approach, four model systems are studied. Differential electrochemical mass spectrometry (DEMS) data and electrochemical data is used to parameterise physical models of the CO and methanol electrooxidation. The second part covers bioelectrochemical reactions. The first DEMS results on acetate oxidation in electrochemically active biofilms are presented, and storage mechanisms for charge as well as substrate are quantified. Furthermore, conversion pathways and rate constants in bioelectrochemical glycerol oxidation are investigated. In conclusion, it is demonstrated that the identification of electrochemical macrokinetics benefits significantly from the application of dynamic techniques, concentration measurements, physical ...
The development of a novel and simple inhibition biosensor array for detection of water pollutants based on immobilized bacteria is the main goal of this work. A series of electrochemical measurements (i.e. cyclic voltammograms) were carried out on screen-printed gold electrodes with three types of bacteria, namely Escherichia coli, Shewanella oneidensis, and Methylococcus capsulatus, immobilized via poly L-lysine. For comparison purposes, similar measurements were carried out on bacteria samples in solutions,; also optical measurements (fluorescence microscopy, optical density, and flow cytometry) were performed on the same bacteria in both liquid and  immobilized forms. The study of the effect of heavy metal ions (lead), pesticides (atrazine) and petrochemicals (hexane) on DC electrochemical characteristics of immobilized bacteria revealed a possibility of pattern recognition of the above inhibition agents in aquatic environment.
The drive to develop better electrochemical energy storage devices requires the development of not only new materials, but also better understanding of the underpinning chemical and dynamical processes within such devices during operation, for which new analytical techniques are required. Currently, there are few techniques that can probe local composition and transport in the electrolyte during battery operation. In this paper, we report a novel application of magnetic resonance imaging (MRI) for probing electrochemical processes in a model electrochemical cell. Using MRI, the transport and zinc and oxygen electrochemistry in an alkaline electrolyte, typical of that found in zinc-air batteries, are investigated. Magnetic resonance relaxation maps of the electrolyte are used to visualize the chemical composition and electrochemical processes occurring during discharge in this model metal-air battery. Such experiments will be useful in the development of new energy storage/conversion devices, as ...
International Journal of Electrochemistry is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles that further our understanding of fundamental electrochemical processes, describe new electrochemical techniques, apply electrochemistry in analytical determination, or apply electrochemistry for chemical reactivity.
International Journal of Electrochemistry is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles that further our understanding of fundamental electrochemical processes, describe new electrochemical techniques, apply electrochemistry in analytical determination, or apply electrochemistry for chemical reactivity.
Article Electrochemical oxidation of wastewater – opportunities and drawbacks. Electrochemical oxidation by means of boron-doped diamond (BDD) anodes generates a very efficient oxidizing environment by forming hydroxyl radicals, providing effe...
TY - GEN. T1 - Relationship between electrochemical properties and electrolyte partial conductivities of proton-conducting ceramic fuel cells. AU - Matsuzaki, Y.. AU - Tachikawa, Y.. AU - Somekawa, T.. AU - Sato, K.. AU - Kawabata, Y.. AU - Sugahara, M.. AU - Matsumoto, H.. AU - Taniguchi, S.. AU - Sasaki, K.. PY - 2017/5/30. Y1 - 2017/5/30. N2 - The electrochemical properties of the proton-conducting ceramic fuel cells (PCFCs) with BaZr0.1Ce0.7Y0.1X0.1O3-δ (BZCYX, X = Ga, Sc, In, Yb, or Gd) electrolytes have been investigated. BZCYX materials were found to have various partial conductivities of charge-carriers such as ion, hole, and electron. The electrochemical properties exhibited strong dependences on operation conditions. When ASR and external current density were fixed at 0.4 Ω cm2 and 0.25 A cm-2, respectively, the electrical efficiency, η(X), was found to have the following sequential order: η(Sc) , η(In) , η(Ga) , η(Yb) , η(Gd). On the other hand, when ASR was not fixed but the ...
A systematic study of the synthesis of heacyanoferrate-doped polypyrrole (PPy/HCF) is reported. In addition to the electrochemical growth of films, we report three different modifications of a novel chemical synthesis for the preparation of bulk powdered materials by oxidative polymerization of pyrrole by the acid derivative of HCF. The effect of temperature and duration of the reaction, doping level and aging of the materials obtained on their conductivity has been systematically studied. Higher conductivities are obtained for materials prepared at lower temperatures (0°C). This is associated to a higher content of the doping HCF anion for these lower temperature materials. With time the conductivity of all samples decreases proportionally to the corresponding initial values. Finally, we report the electrochemical properties of these hybrid materials, the cyclic voltammograms of chemical and electrochemical derivatives and their intercalation behavior, which shows a deintercalation of the ...
Chemistry, The Central Science , 10th edition Theodore L. Brown; H. Eugene LeMay, Jr.; and Bruce E. Bursten. Chapter 20 Electrochemistry. Electrochemical Reactions. In electrochemical reactions, electrons are transferred from one species to another. Oxidation Numbers. Slideshow 5745865 by jeroen
A sensor system accurately measures nitrogen oxide (NOx) in a gas mixture via the use of at least one electrochemical sensing cell and differential pulse voltammetry (DPV). The sensor system has a sensor with an electrochemical sensing cell for producing an electrical signal (current, voltage, etc.) indicative of an amount of the nitrogen oxide within the gas mixture. The sensing cell has an electrolyte interposed between an anode electrocatalyst and a cathode electrocatalyst. Significantly, a DPV mechanism is connected to the sensing cell for enhancing the sensitivity and selectivity of the electrolyte associated with the sensing cell. The DPV mechanism has (1) a pulse superimposition mechanism for combining a pulse with a sensing cell bias imposed upon the sensing cell; (2) a measurement mechanism for measuring the electrical signal before and during superimposition of the pulse to derive first and second sample signals; and (3) a concentration derivation mechanism for mathematically combining
In their thirteenth year this year, the 2016 award for Scientific Research in Electrochemistry, with a grant of €40000, has gone to the work developed by the ICN2 Novel Energy-Oriented Materials Group, led by Prof. Pedro Gómez-Romero.. The research project, developed over the past four years, has accomplished the design, fabrication and testing of hybrid nanocomposite electrodes for energy storage. This involves bringing together the materials and electrodes typically used in batteries and those typically used in supercapacitors to create hybrid energy storage devices that offer both high energy and high power densities. Among the potential applications of this technology are electric vehicles that need batteries that can recharge quickly and run for long periods.. The goal of these awards is to promote scientific study, technological development and innovation in the field of electrochemistry. Run by the CIDETEC technology centre in San Sebastian, they reward primarily Spanish researchers at ...
Amperometry and cyclic voltammetry are two electrochemical techniques that enable the detection of electroactive neurotransmitters that are released from single cells
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The Electrochemistry Laboratory (LEC), established 1988, is part of the Energy and Environment Research Division (ENE) at the Paul Scherrer Institute. The laboratory comprises two sections and 5 interacting groups that deal with almost all aspects of electrochemical energy storage and conversion. PSIs Electrochemistry Laboratory is Switzerlands largest Center for Electrochemical Research.
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GRS Electrochemistry 2016, The Gordon Research Seminar on Electrochemistry is a Chemistry Seminar, organized in Ventura, California. Learn More About Event
Author: Chen, Xiao et al.; Genre: Journal Article; Published in Print: 2012-03; Keywords: Intermetallic compounds; Nanostructures; Chemical synthesis; Electrochemical measurements; Electrochemical properties; Title: Structural and electrochemical properties of nanostructured nickel silicides by reduction and silicification of high-surface-area nickel oxide
In this work, the electrochemical behavior of nonredox-active poly-L-lysine dendrigraft molecules of four different generations was investigated at the interface between two immiscible electrolyte solutions (ITIES). The influence of the dendrigraft generation on the electrochemical response, sensitivity of the calibration curves, and limit of detection was studied. Cyclic voltammetry at the ITIES revealed that the sensitivity increased (1840 to 25 800 nA µM-1) and the limit of detection decreased (11.10 to 0.65 µM) as the dendrigraft generation increased from generation G2 through to generation G5, respectively. The results are compared to those for protein voltammetry at the ITIES. Our studies suggest that the sensitivity expected for a synthetic ionized macromolecule can be predicted on the basis of its net charge and its diffusion coefficient. However, electrochemistry at the ITIES demonstrates a greater sensitivity toward proteins, which is attributed to their tertiary structure.. ...
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This project will explore the influence of size on the electrochemical behavior of metal and metal oxide nanoparticles (NPs). Particular focus will be on the effects of surface stress on electrochemical behavior at the nanoscale. Systems that will be examined include discrete NPs of Ag, Pd and MnO2, all of which are relevant in the area of electrochemical energy storage and conversion The newly discovered Ag and Pd NPs are capped with adenosine triphosphate, ATP. They can be isolated as solids and dissolved at high concentrations in aqueous supporting electrolytes, thus enabling facile study of their electrochemical behavior in thin layerby- layer films and as individual, dissolved NPs. The MnO2 NPs have been previously reported, but their electrochemical behavior has not been examined thoroughly. Both types of NPs will be assembled into layer-by-layer films so their electrochemical behavior can be examined. The ability to make these NPs in different sizes will be exploited to evaluate the size ...
The main objective of this study is removal of pathogenic bacteria using electrochemical process. The bactericidal effects of electrochemical system containing steel mesh electrode were evaluated from contaminated water with E. coli, Pseudomonas aeroginosa, Staphylococcus aureous and Streptococcus fecalis at various concentrations. Effect of current density, supporting electrolyte and pathogenic bacterial concentration were studied and kinetic rate of disinfection were determined. The obtained results show, the effect of current density on disinfection efficiency was highest and then concentration of bacteria in the contaminated water and supporting electrolyte concentrations in the electrolyte have more effective. Contaminated water including 100 and 1000 bacteria/ml of Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and streptococcus faecalis, compeletly disinfected using 0.088 mA/cm2 current during 5 to 60 min. The reaction rate of disinfection is directly related to current density.
Article Development of a system for treatment of coconut industry wastewater using electrochemical processes followed by Fenton reaction. The coconut processing industry generates a significant amount of liquid waste. New technologies targeting the t...
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Peripherally and non-peripherally terminal alkynyl substituted manganese phthalocyanines (MnPc) were synthesized and characterized and then used as functional materials in modified electrodes. MnPcs were substituted with alkynyl groups, which are reactive moieties in click electrochemistry (CEC) reactions. M
The Cyclic Voltammetry International School will consist of morning classes dedicated to the application of cyclic voltammetry to the various fields of molecular and biomolecular electrochemistry and followed by correlating hands-on laboratory sessions in the afternoon. The morning classes will cover core concepts of cyclic voltammetry, and its application to the analysis of coupled chemical reactions, catalytic systems and redox enzymes. Afternoon sessions will involve laboratory work that illustrates the concepts discussed in each morning session. In the introductory laboratory session, all participants will perform basic voltammetry experiments. These sessions will then progress into more advanced experiments to illustrate strategies that can be used for deciphering complex mechanisms. In addition, participants will receive supporting materials that will guide them through this five-day course ...
The Cyclic Voltammetry International School will consist of morning classes dedicated to the application of cyclic voltammetry to the various fields of molecular and biomolecular electrochemistry and followed by correlating hands-on laboratory sessions in the afternoon. The morning classes will cover core concepts of cyclic voltammetry, and its application to the analysis of coupled chemical reactions, catalytic systems and redox enzymes. Afternoon sessions will involve laboratory work that illustrates the concepts discussed in each morning session. In the introductory laboratory session, all participants will perform basic voltammetry experiments. These sessions will then progress into more advanced experiments to illustrate strategies that can be used for deciphering complex mechanisms. In addition, participants will receive supporting materials that will guide them through this five-day course ...
This volume analyzes and summarizes recent developments in several key interfacial electrochemical systems in the areas of fuel cell electrocatatalysis, electrosynthesis and electrodeposition. The six Chapters are written by internationally recognized experts in these areas and address both fundamental and practical aspects of several existing or emerging key electrochemical technologies. The Chapter by R. Adzic, N. Marinkovic and M. Vukmirovic provides a lucid and authoritative treatment of the electrochemistry and electrocatalysis of Ruthenium, a key element for the devel- ment of efficient electrodes for polymer electrolyte (PEM) fuel cells. Starting from fundamental surface science studies and interfacial considerations, this up-to-date review by some of the pioneers in this field, provides a deep insight in the complex catalytic-electrocatalytic phenomena occurring at the interfaces of PEM fuel cell electrodes and a comprehensive treatment of recent developments in this extremely important field.
By developing the glass electrode 70 years ago, SCHOTT laid the foundation for the success of electrochemical measurement. With high-performance pH glasses, innovative electrodes and electrochemical measuring instruments such as pH meters, conductometers, oxygen measuring instruments, piston burettes and titrators we have since made sure that electrochemical measurement today is an indispensable, trouble-free and reliable procedure all over the world.
By developing the glass electrode 70 years ago, SCHOTT laid the foundation for the success of electrochemical measurement. With high-performance pH glasses, innovative electrodes and electrochemical measuring instruments such as pH meters, conductometers, oxygen measuring instruments, piston burettes and titrators we have since made sure that electrochemical measurement today is an indispensable, trouble-free and reliable procedure all over the world.
Different designs of a semiopen, drainable cathode compartment of a medium-sized coulometric Karl Fischer (KF) cell for the determination of water in the range 0.1-500 mug were evaluated. The main criterion for the design was to keep the resistance between the anolyte and catholyte low enough to permit the generation of currents larger than 20 mA (for an output voltage of 28 V). It was found that a good compromise between the size of this current and a minimal influence from diffusing/migrating oxidizable reduction products from the catholyte was achieved by means of an interface having a channel length and diameter of 8 and 2.1 mm, respectively (catholyte volume, similar to1 mL). To show the general applicability of the concept, the following different types of coulometric reagents suitable for nonpolar and polar samples, as well as for samples containing active carbonyl compounds, were investigated: Hydranal Coulomat A, AD, AX, AG-H (modified with chloroform, Merck), and two homemade ...
Cyclic voltammetry, an analytical technique in electrochemistry, can be studied with modeling. Eliminate the need for a time-dependent model with an approximation.
Inexpensive, readily available photovoltaic cells have been used to conduct indirect electrochemical oxidation reactions. The reactions retain the efficiency of the solar-electrochemical method while capitalizing on the unique opportunities for selectivity afforded by a chemical oxidant. The versatility of the electrochemical method allowed for the recycling of Os(VIII)-, TEMPO-, Ce(IV)-, Pd(II)-, Ru(VIII)-, and Mn(V)-oxidants all with the same very simple reaction apparatus.. ...
TY - GEN. T1 - Electrochemical studies on the SEI-formation process in the presence of vinylene electrolyte additives. AU - Santner, Heinrich. AU - Möller, Kai-Christian. AU - Besenhard, Jürgen. AU - Winter, Martin. N1 - , Seite von - bis: ?. PY - 2003. Y1 - 2003. M3 - Conference contribution. SN - 1-56677-403-9. BT - PV-2003-20, New trends in intercalation compounds for energy storage and conversion. PB - The Electrochemical Society Inc.. CY - Pennington. ER - ...
Oxidation and reduction reactions power your phone and make it possible for your body to use the oxygen you inhale. We will learn about oxidation states (numbers), oxidation-reduction (redox) reactions, galvanic/voltaic cells, electrolytic cells, cell potentials, and how electrochemistry is related to thermodynamics and equilibrium.
Rechargeable aprotic alkali metal (Li or Na)-O2 batteries are the subject of great interest because of their high theoretical specific energy. However, the growth of dendrites and cracks at the Li or Na anode, as well as their corrosive oxidation lead to poor cycling stability and safety issues. Understanding the mechanism and improving Li/Na-ion plating and stripping electrochemistry are therefore essential to realizing their technological potential. Here, we report how the use of a Li-Na alloy anode and an electrolyte additive realizes an aprotic bimetal Li-Na alloy-O2 battery with improved cycling stability. Electrochemical investigations show that stripping and plating of Li and Na and the robust and flexible passivation film formed in situ (by 1,3-dioxolane additive reacting with the Li-Na alloy) suppress dendrite and buffer alloy anode volume expansion and thus prevent cracking, avoiding electrolyte consumption and ensuring high electron transport efficiency and continued electrochemical reactions
Redox Reactions and Electrochemistry - Review - Training MCAT General Chemistry Review - to help you review the general chemistry topics covered on the MCAT