Dependence of the Current Density Distribution with Flow Channel Geometry in a Half-Cell Model - new
O. Beruski, J. Perez
Institute of Chemistry of São Carlos, São Carlos, SP, Brazil
The present work demonstrates that a simple half-cell model is capable of reproducing qualitatively the main features of the measurements of the current density distribution in a high-temperature polymer electrolyte fuel cell, pointing that computational modeling and simulation are an important tool in the development of such devices. Our main interests with such a model is to optimize working ...
E. Robalinho , E. F. Cunha , M. Linardi , E. I. Santiago ,
 Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN, São Paulo, SP, Brazil; and Instituto Federal do Rio Grande do Sul - IFRS, Porto Alegre, RS, Brazil
 Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN, São Paulo, SP, Brazil
The idea of a friendly implementation of a mathematical formulation using specialist software was performed with the support of COMSOL Multiphysics® software with Chemical Reaction Engineering and Batteries & Fuel Cell Modules. The real problem of a Proton Exchange Membrane – PEM fuel cell modeling involves different scales, multiple variables and processes, coupling of solvers and experimental ...
Geraint Minton , Rajlakshmi Purkayastha , Laura O’Neill , Sylwia Walus , Mark Wild , Monica Marinescu , Teng Zhang , Gregory Offer ,
 Oxis Energy Ltd, Abingdon, Oxfordshire, UK
 Mechanical Engineering Department, Imperial College, London, UK
Lithium-sulphur (Li-S) batteries have the potential to surpass the energy storage capability of Li-ion batteries due to their high theoretical gravimetric energy density of 2700 Wh/kg. However, the processes which drive the system behaviour are much more complex than those in a Li-ion cell, meaning that controlling them to realise energy densities much above 350 Wh/kg is challenging. In a Li ...
J. H. Al-Smail 
 King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia
We develop a porosity-optimization problem to improve the electrochemical reactions taking place in hydrogen fuel cells. We introduce a mathematical model, which involves a system of conservation laws defined in a porous space domain. Our goal is to find the domain's optimal porosity function that can make the oxygen-hydrogen reaction as uniform as possible. The optimal porosity design ...
Modeling and Simulation of Transient SECM (Scanning ElectroChemical Microscopy) Response of Porous Electrodes
L. Balboa , G. Wittstock ,
 Institute of Chemistry, Carl v. Ossietzky Universität Oldenburg, Oldenburg, Germany
In the past two decades, highly porous nanostructured materials have been investigated and used for a large variety of applications, such as catalysis, energy conversion/storage, optics, sensing and more. Nanoporous gold (npAu) is one of such materials which have shown great potential as an electro-catalyst due to not only its physical properties but its surface chemistry as well. It presents a ...
王琼 , 屈治国 ,
引言 钒液流电池储能技术作为高效电化学储能技术之一，可应用于新能源储能，电网削峰填谷、调频调幅、应急电源等。钒液流电池储能技术具有独立的的额定功率和额定能量，高输出功率，低成本等特点。 COMSOL Multiphysics® 的使用 本文采用分区建模，模型耦合的方式进行模拟。 结果 钒液流电池在组装过程中需要一定的组装压力以避免电解液的泄漏，同时可减小电极与集流板的接触电阻。如图1所示，有研究表明有流道的集流板与石墨毡电极接触并挤压时，由于流道脊与流道的不均匀表面，会使石墨毡电极出现非均匀压缩现象。图2为均匀模型(SU-5)与非均匀模型(SNI-5)电池压降与实验结果(Exp-5)在CR=55.67%的对比。结果显示考虑了石墨非均匀压缩导致的变形之后的模拟结果与实验结果相吻合。图3为非均匀模型与均匀模型在CR=41.83%情况下的对比图。如图所示 ...
P. Fodor, and J. D'Alessandro
Dept. of Physics
Cleveland State University
In this work a miniaturized fuel cell design based on microchannels, into which the liquid fuel and oxidizer streams are fed through T shaped connectors, is optimized for improved fuel usage. This particular design exploits the laminar nature of the fluid flow at small Reynolds numbers to keep the fuel and oxidizer confined in the vicinity of the corresponding electrodes without the need of a ...
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 ...
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 ...
Numerical and Experimental Study of Flow, Heat Transfer and Concentration in a Scaled-up Fuel Cell Anode Channel Model
J. C. Torchia-Nüñez, and J.G. Cervantes-de-Gortari
Department of Thermal Engineering, National University of Mexico, UNAM, Mexico City, Mexico
Flow, concentration and temperature fields are studied with numerical and experimental methods inside a scaled-up fuel cell anode channel model. The low aspect ratio channel has a porous medium as the inferior wall where a mixing of different pH solutions occurs. Chromatic change of phenolphthalein is used to visualize concentration field and Particle Image Velocimetry (PIV) is used to visualize ...