Screening Effects in Probing the Electric Double Layer by Scanning Electrochemical Potential Microscopy
R.F. Hamou, P.U. Biedermann, A. Erbe, and M. Rohwerder
Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany
A computational method is developed to study probing the electric double layer by Scanning Electrochemical Potential Microscopy. The model is based on a modified Poisson- Boltzmann equation, which takes into account steric effects. We investigated the effect of metallic apex protrusion and the Open Circuit Potential (OCP) of the tip on the probed potential. A clear electrostatic screening effect ...
M. Hackert, G. Meichsner, and A. Schubert[1,2]
Micromanufacturing Technology, Chemnitz University of Technology, Chemnitz, Germany
Fraunhofer Institute of Machine Tools and Forming Technology, Chemnitz, Germany
Electrochemical Machining with a closed electrolytic free jet is a special procedure to generate complex micro structures by help of anodic dissolution. The work piece shape is fabricated by supplying an electrolytic current through an electrolyte jet ejected from a small nozzle. In this study COMSOL Multiphysics is used to simulate the electric current density in the jet and the dissolution ...
A. Mossadegh Pour, A. Dhira , R. Steinberger-Wilckensa
Department of Chemistry, University of Birmingham, Edgbaston, Birmingham, United Kingdom
Auxiliary Power Units can play an important role in reducing vehicle emissions, especially in diesel and kerosene driven vehicles. In conventional vehicles the electricity supply comes from a generator that is directly coupled to the propulsion engine. New generation of fuel cell APUs exclusively use Solid Oxide Fuel Cells with some developments in high temperature polymer electrolyte membranes ...
A. Oury ,
 SIMTEC, Grenoble, France
Numerical simulation can be advantageously employed to predict the main cell features (e.g., the reaction rate distribution on the electrodes, the cell voltage, or the electrolyte temperature) in order to optimize the design and operational conditions of the process. In this poster, we describe two complementary computational approaches applied to a molten salt electro-refiner for ...
W. Booth, J. Schiffbauer, J. Fernandez, K. Kelley, A. Timperman, and B. Edwards
Physics Department, West Virginia University, Morgantown, WV, USA
Chemical Engineering Department, West Virginia University, Morgantown, WV, USA
Chemistry Department, West Virginia University, Morgantown, WV, USA
The steady-state non-equilibrium distributions of two species of mono-valent ions around a charged nanofluidic channel have been examined. Large reservoirs were placed on either side of the nanoscale channel to simulate bulk concentration of ions in a fluid. Results from COMSOL Multiphysics simulations show that the effect of the potential bias across the nanochannel yields a significant ...
Ford Motor Company
Dr. Bernardi is a Research Engineer with Ford Motor Company in Dearborn, MI. Her research focuses on the analysis and simulation of electrochemical energy-storage and conversion systems. In particular, Dr. Bernardi develops mathematical models that predict system behavior and identify governing physicochemical processes. Experimental investigations support model development, analysis, and ...
Modeling a Non-Flooding Hybrid Polymer Electrolyte Fuel Cell and Related Diffusion-Migration-Reaction Systems
B.E. McNealy, J.L. Hertz
University of Delaware, Newark, DE, USA
Introduction: Understanding the mass and charge transport behavior of heterogeneous systems that include diffusion, migration, and reaction of ions is important in fuel cells, batteries, and other electrochemical applications. Here, a numerical model for charged species transport and reaction has been developed to simulate the electrochemical behavior of a novel type of “non-flooding” hybrid ...
C. K. Subramaniam, Muthuraja
School of Electronics Engineering, VIT University, Vellore, Tamil Nadu, India
The Direct Methanol Fuel Cell (DMFC) working is dependent on the concentration of methanol in water before it is introduced in the anode. DMFC has a high energy density when generating electrical power from fuel, and is an attractive power source for portable devices. A fundamental limitation in DMFC technology is methanol crossover. In this process methanol diffuses from the anode through the ...
Ramesh P, S.P Duttagupta
Indian Institute of Technology Bombay,Mumbai, Maharashtra, India
Air breathing proton exchange membrane fuel cells have now found its use in wide range of domestic and commercial energy based applications. Optimization of Proton Exchange Membrane Fuel Cell system parameters and its safer operation under dynamic conditions ensure higher system output and longer device lifetime. Ensuring safety against oxygen starvation reduces the degradation of membrane ...
F. A. Daniels, D. J. L. Brett, A. R. Kucernak, and C. Attingre
University College London, London, UK
Imperial College London, London, UK
Polymer electrolyte membrane (PEM) fuel cells have significant potential as a source of clean, efficient energy production. This study presents a three-dimensional, non-isothermal, fully-coupled model of a PEM fuel cell with printed circuit board current collectors. The effect of the current collector design on transport phenomena and consequent cell performance is investigated. The model ...