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2 edition of Mass transfer effects in electrochemical cells containing porous electrodes found in the catalog.

Mass transfer effects in electrochemical cells containing porous electrodes

T. D. Doherty

Mass transfer effects in electrochemical cells containing porous electrodes

by T. D. Doherty

  • 249 Want to read
  • 40 Currently reading

Published by UMIST in Manchester .
Written in English


Edition Notes

StatementT.D. Doherty ; supervised by D.J. Pickett..
ContributionsPickett, D. J., Chemical Engineering.
ID Numbers
Open LibraryOL16502397M

Three-dimensional hierarchical porous graphitic carbon (HPGC) were synthesized via one-step carbonization-activation and a catalytic strategy. The method can not only improve the graphitization degree of carbon materials, but also offer plentiful interfaces for charge accumulation and short paths for ion/electron transport. Polypyrrole, potassium hydroxide, and nickel acetate were used as the. tense local stirring (11). The combined effect on mass transfer of rising bubbles plus bubble evolution, as ob- served in chlorate electrolysis, was found to be a linear addition of two mass-transfer coefficients (12, 13). This concept will be used in the present study, and appears in the form of Eq.

Advanced Electrochemistry Lecture Notes. This note explains the following topics: Nonfaradaic processes and electrode-solution interface, Faradaic processes and rates of electrode reactions, Mass-transfer controlled reactions, Basic Electrochemical Thermodynamics, Electrochemical potential, Liquid junction potential, Selective electrodes, Essentials of electrode reactions, Butler-Volmer model. Mass transfer as limiting factor commercial arrangement in reactors electrode flow velocity [m s-1] k [m s-1] cmin [mol m-3] desc electrode 1 1x 5 rotating cylindrical electrode 10 1x 5x porous electrode (RVC) 0,10 1x 5x 3D electrode (particles) packed bed 0,10 2x 5x fluidised bed 0,01 6x 1x

  Aqueous-phase electrochemical reduction of carbon dioxide requires an active, earth-abundant electrocatalyst, as well as highly efficient mass transport. Here we report the design of a porous. Sara Barati, Behnam Khoshandam, Mohsen Mehdipour Ghazi, An investigation of channel blockage effects on hydrogen mass transfer in a proton exchange membrane fuel cell with various geometries and optimization by response surface methodology, International Journal of Hydrogen Energy, /ne, ().


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Mass transfer effects in electrochemical cells containing porous electrodes by T. D. Doherty Download PDF EPUB FB2

Where h m is the mass transfer coefficient, L c is the characteristic length, and D is the mass diffusivity. The Nusselt and Sherwood numbers represent the effectiveness of heat and mass convection at the surface of a human body, respectively. For forced convection of blood flow inside a vessel, there exists an important analogy between the Nusselt number, which depends on the Reynolds and the.

Presented in 4 sections, the book covers: Thermodynamics of Electrochemical Cells, Electrode Kinetics and Other Interfacial Phenomena, Transport Processes in Electrolytic Solutions, and Current Distribution and Mass Transfer in Electrochemical Systems.

It also features three appendixes containing information on: Partial Molar Volumes, Vectors. The adsorption of CO 2 on the electrode surface most likely takes place simultaneously with the transfer of the first electron and/or proton transfer due to the high energy required to bend the CO 2 molecule.

45 The rates of the electrochemical CO 2 reduction is usually limited by the electron transfer at low overpotentials while, at high. nounced effect on the mass transfer in the ECS. 3D electrodes and porous as they contribute to the kinetics of the overall processes occurring at each electrode of any electrochemical cell.

pare the mass transfer phenomena hetween electrochemical and non-electro­ chemical units. It is important to see how non-electrochemical mass transfer data can he applied for designing electrochemical reactors with high specific surface electrodes. The mass transfer in an electrochemical system is due to migration, dif­ fusion and convection.

The model, in order to consider all the losses occurring in an electrode, includes Ohm’s law for ionic and electronic charge transport, and the Butler-Volmer equation to evaluate the activation polarizations, and mass transport equations, taking into account diffusion through porous media, to evaluate the concentration losses.

Qiang Ma's 32 research works with 88 citations and reads, including: Carbon supported PtPdCr ternary alloy nanoparticles with enhanced electrocatalytic activity and durability for methanol. The electrochemical cell can be controlled by mass transfer at the electrode surface. In the electrochemical cell, for example, a metal- ion concentration at the cathode surface decreased by electrolysis.

The mass flux of a metal-ion generated by a special concentration gradient can be. Bimodal porous Ag consisted of submicro-porous and nanoporous bicontinuous structures is aimed to be fabricated through electrochemical dealloying of dual-phase Ag 10 Zn 90 alloy in M KOH solution.

The bimodal nanoporous silver is highly expected to exhibit the superior catalytic performance of direct oxidation of ammonia-borane (AB). uid electrochemical cells using ILs have been used for in situ characterization (19).

Herein, we introduce solid-state three-elec-trode electrochemical cells (also known as half-cells) incorporating thin IL membranes for in situ characterization of solid EEIs.

Im-portantly, the in situ electrochemical cell designed using a porous IL. Redox flow batteries (RFBs) are an emerging electrochemical technology suitable for energy-intensive grid storage, but further cost reductions are needed for broad deployment.

Ove. Electrochemical Cells New Advances in Fundamental Researches and Applications. Edited by Currently the research field of electrochemical cells is a hotspot for scientists and engineers working in advanced frontlines of micro- nano- and bio-technologies, especially for improving our systems of energy generation and conversation, health care, and environmental protection.

Not only can this be a major contributing factor to the overall cell potential in a two-electrode setup but it must be taken into account when correcting for the potential of the working CO 2 reduction cathode in a three-electrode system. While electrochemical impendence spectroscopy (EIS) is typically performed even in H-cells to determine a.

Electrochemical oxidation of four different alcohol molecules (methanol, ethanol, n-butanol and 2-butanol) at electrodeposited Pt film and carbon-supported Pt catalyst film electrodes, as well as the effect of mass transport on the oxidation reaction, has been studied systematically using the rotating disk electrode (RDE) was shown that oxidation current decreased with an increase.

When a net reaction proceeds in an electrochemical cell, oxidation occurs at one electrode (the anode) and reduction takes place at the other electrode (the cathode.) We can think of the cell as consisting of two half-cells joined together by an external circuit through which electrons flow and an internal pathway that allows ions to migrate.

Journal of The Electrochemical Society OPEN ACCESS Electrochemical Impedance Spectroscopy of Oxygen Reduction Reaction (ORR) in a Rotating Disk Electrode Configuration: Effect of Ionomer Content and Carbon-Support To cite this article: Ramesh Kumar Singh et al J.

Electrochem. Soc. F View the article online for updates and enhancements. This work describes the development and characterisation of an electrochemical cell which can be used to give high reactant conversion without the need for a membrane.

The undivided cell uses two high porosity flow-through graphite felt electrodes, with the products flowing through the back of each electrode.

A series of tests have been conducted using an equimolar mixture of potassium. The electrocatalytic nonoxidative dimerization of methane to ethane and ethylene was studied at °C and 1 atm. The electrochemical cell used was where the solid electrolyte was a proton conductor.

By applying a current to the cell, H + was pumped to or from the Ag electrodes. Under closed circuit the rate of methane dehydrogenation to ethane and ethylene could increase to as much as eight.

electrolysis cell. Electrochemical cells have to be designed in a way to respect the two above constraints, and the above comments can be made: • Motion, circulation of the electrolytic media has to favor mass transfer to the electrode.

For some cases, the electrode motion induces mass transfer to the electrode. The need for electrochemical engineering arises in society because of technological applications that involve electrochemical phenomena such as synthesis of chemicals, electrowinning and refining of metals, batteries and fuel cells, sensors, surface modification by electrodeposition and etching, separations, and corrosion, to mention a of these involves components (electrode.

() Effect of the ion-exchange-membrane/solution interfacial characteristics on the mass transfer at severe current regimes. Russian Journal of Electrochemistry() Frumkin-Butler-Volmer theory and mass transfer in electrochemical cells.

How to cite this article: Kim, O.-H. et al. Ordered macroporous platinum electrode and enhanced mass transfer in fuel cells using inverse opal structure. Nat. Commun. doi: A dynamic diffuse double-layer model is developed for describing the electrode/electrolyte interface bearing a redox reaction.

It overcomes the dilemma of the traditional voltammetric theories based on the depletion layer and Frumkin's model for double-layer effects in predicating the voltammetric behavior of nanometer-sized electrodes. Starting from the Nernst−Planck equation, a dynamic.