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 ...
M. Vallance, and R. White
General Electric Global Research Center, Niskayuna, NY, USA
Department of Chemical Engineering, University of South Carolina, Columbia, SC, USA
Sodium/metal chloride storage batteries, used in hybrid propulsion applications, provide high energy and power densities safely and reliably. To understand the dynamics of electrochemical cycling, a high-temperature sodium/ferrous chloride storage cell was modeled in two dimensions. The time-dependent solution shows that a reaction front, starting at the interface with the negative electrode, ...
A. Nyman, M. Behm, and G. Lindbergh
Applied Electrochemistry, School of Chemical Science and Engineering, Royal Institute of Technology Stockholm, Sweden
Modeling of mass transport is an important step in evaluating lithium-ion battery electrolytes and understanding cell performance. For high-power applications, concentration gradients in the electrolyte lead to limiting currents, which limit the power-density of the battery. The model has been used for determining a complete set of transport and thermodynamic properties for LiPF6 dissolved in an ...
B K SRIHARI, Dr K Nagarajan, Dr B Prabhakar Reddy, P VENKATESH
Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, India
In the design of electrorefiner, Working electrode and Counter electrode surface areas are very important. The main aim of this study is to understand the effect of the ratio of Anode to cathode Surface areas in an electrorefining cell. Application of this model to design electrorefiner for metallic spent nuclear fuel is discussed with respect to Uranium recovery. Shaping of real anode surface ...
M. Freda, A. Giannetti, L. Lattanzi, S. Luperi
Centro Sviluppo Materiali, Rome, Italy
The electrochemical pickling of steel has two main purposes: 1) To remove thermal oxide; 2) To dissolve chromium-depleted layer, to reinstate the corrosion-resistant properties of the stainless steel; A reliable, flexible and robust 3D model has been made for simulating the steel electrochemical pickling. This process is modeled as a multiphysics system for the current control. The model ...
S. Skoda, E. Robalinho, E. F. Cunha, M. Linardi
Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN-SP, São Paulo, SP, Brazil
Universidade Nove de Julho - UNINOVE, São Paulo, SP, Brazil
The use of numerical techniques in PEM fuel cell sensoring represents an advantage of project engineering, reducing the costs and accelerating the manufacturing of prototypes. In this work some numerical responses are shown, relating to numerical sensoring of water and oxygen mole fractions at cathode of a 5 cm² of geometric area PEM fuel cell. The need to recognize a geometric figure of merit ...
向斌 , 江露 , 周洋 , 王佳宁 
引言：钢结构设备的防腐保护主要采用阴极保护和涂层保护。其中，涂层保护除了防腐同时具备防红外、降温等特殊性能。 此次模拟，通过 COMSOL Multiphysics® 模拟设备在裸钢和 SiO2@ATO 涂层状态下的表面电位分布，证实了 SiO2@ATO 涂层的防腐性和抗红外及降温性能，并验证了 COMSOL Multiphysics® 数值模拟碳钢腐蚀表面电位分布的可靠性。 模拟过程中，假设电解质电导率为常数，阳极的各参数（尺寸、成分、分布等）保持不变。 计算方法：使用“二次电流分布”接口描述电极反应，“稀物质传递”接口描述亚铁离子输运，采用瞬态研究。参数： 1）温度 T； 2）电解质电导率 σ； 3）阴、阳极平衡电位 E_a、E_c； 4）阴、阳极交换电流密度 i0_c、i0_a； 5）传递系数 α 和 β； 6）初始时刻的亚铁离子浓度； 7 ...
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 ...
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 ...
Y. Wang, D. Uwe Sauer
Electrochemical Energy Conversion and Storage Systems, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Aachen, Germany
HTPEM fuel cells are considered to be the next generation fuel cells. The electrochemical kinetics for electrode reactions are enhanced by using PBI membrane at an operation temperature between 160-180 °C comparing to LTPEM fuel cells. But starting HTPEM fuel cells from room temperature to an operation temperature is a challenge. In this work, using preheated air to heat up the fuel cells ...