Michael A. Vallance
Team Leader, GE Global Research
Over time, rechargeable batteries degrade and eventually stop working. You see some combination of declining capacity, rapid self-discharge, and reduced power. Degradation mode depends on battery design, but also on the application. Often, multiple physical processes contribute to degradation. In the laboratory, you can measure performance degradation. You can dissect the battery to discover ...
T. Machado Amorim , C. Allély, J. Caire
Arcelor Mittal Research, Maizieres-les-Metz, France
ENSEEG, Grenoble, France
The corrosion at cut-made edges is significant due to the anode to cathode surface ratio in this region. The major problems are the risks of red rust appearance at the exposed steel surface, and the risks of paint delamination in case of insufficient corrosion protection. The work presented here focuses on the development of a 2D FEM model simulating a steady state corrosion situation at a cut ...
R. Hamou, P. Biedermann, M. Rohwerder, and A. Blumeneau
Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany
The present work focuses on modeling a new experimental technique: Scanning Electro-chemical Potential Microscopy (SECPM), which is used to probe the potential profile of the electric double layer (EDL). We used an electrostatic approach to compute the EDL potential measured within the metallic probe. Also, we investigated the effect of the interaction of the electrode/probe double layers on the ...
C. Taxén, and D. Persson
Swerea-Kimab, Stockholm, Sweden
Corrosion of metals in confined zones is a big industrial problem. The electrochemistry of such localized corrosion processes is complicated by the impact of the corrosion processes on the composition of the local solution. In the present problem, local interaction with the atmosphere causes uptake of O2 and CO2 and evaporation of water from the initially dilute NaCl-solution. This model ...
C. Trenado, D. Strauss[1,2], and M. Wittmar
Computational Diagnostics & Biocybernetics Unit, Saarland University Hospital, Homburg, Germany
Leibniz-Institute for New Materials, Saarbrücken, Germany
Progress in coating technology has allowed for the development of free-chromate corrosion inhibitors, which are able to smartly migrate when required. In order to support the coating design, we propose a hybrid mathematical model to study the inhibitor's release by taking into account the thermodynamics and kinetics involved in the corrosion process. The proposed model is ...
International Center for Materials Nanoarchitectonics
National Institute for Materials Science
For the successful exploitation of microdevices such as microsensors, development of micro-power sources is strongly required. In this view, microbatteries and microfuel cells have been developed. Here the concept of on-chip fuel cells, which consist of all the components necessary for power generation integrated on a chip, is introduced. Then, in order to improve their performance, experimental ...
A. Ivanov, U. Mescheder
Furtwangen University, Furtwangen, Germany
In the presented work the dynamic simulation of a silicon anodization process is performed. Two mechanisms of etch form development (diffusion in electrolyte, current flow) are considered and simulated. Influence of electrolyte conductivity and radius of the opening in the masking layer is discussed.
P. Pianko-Oprych, E. Kasilova, Z. Jaworski
West Pomeranian University of Technology, Faculty of Chemical Technology and Engineering, Szczecin, Poland
Micro-tubular Solid Oxide Fuel Cells (mSOFC) are attracting more and more interest as new generation of energy conversion devices. Although commercial applications still suffer from high costs, there is a need for further improvement of the cell performance, durability and start-up. To resolve those challenges, knowledge of the distributions of species concentration, temperature and current ...
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 ...
Analysis of the Electrochemical Removal of Aluminum Matrix Composites Using Multiphysics Simulation - new
M. Hackert-Oschätzchen, N.Lehnert, M. Kowalick, G. Meichsner, A. Schubert[1,2]
Professorship Micromanufacturing Technology, Technische Universität Chemnitz, Chemnitz, Germany
Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany
In the Collaborative Research Centre 692 at TU Chemnitz several academic institutions work on aluminum matrix composites (AMCs). These materials consist of an aluminum matrix, which is reinforced by SiC or Al2O3 particles with dimensions less or equal 1 µm. One main task is finishing machining of AMCs by electrochemical machining (ECM). The goals are depending on the application whether to ...