D. Mizuno, Y. Shi, and R. Kelly
University of Virginia
Aluminum alloys 5000 series are widely used within the cabins of ships. These aluminum alloys are often joined via steel bolts. There is thus a concern that galvanic interactions will exacerbate corrosion of the aluminum alloys. In this study, a model of the galvanic corrosion between aluminum alloy AA5083 and steel under atmospheric conditions was built. The Nernst-Plank equation and 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 ...
R. Pushpangadan, A. Soman, Arundas R., N. G. Thoppan, S. P. Duttagupta
Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai, Maharashtra, India
College of Engineering, Munnar, Kerala, India
PEM fuel cells are very promising for portable applications. A key component of fuel cell is the flow field plate through which hydrogen will reach the anode, oxygen will reach the cathode and electron collection. Flow field plate made of silicon is not a good electrical conductor , so electrical contacts has to be attached to the Gas Diffusion Layer (GDL) for taking the power to outside ...
S. Dudi, R. K. Krishnan
IIT Madras, Chennai, Tamil Nadu, India
 ARCI, IITM Research Park, Chennai, Tamil Nadu, India
A fuel cell is an efficient and clean alternative power source of energy. Alkaline anion exchange membrane (AAEM) fuel cells are one in which conduction of oH- (hydroxyl ion) take place. The advantages of using alkaline fuel cells over proton exchange membrane fuel cells is that electrochemical kinetics is fast and alkaline environment is friendly for catalysts. Experiments performed at ...
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 ...
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 ...
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, ...
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 ...
朱国利 , 李亚东 , 李焰 ,
管道输送是油气能源长距离输送的重要途径。目前管道连接多采用焊接完成，焊接是一个复杂的非平衡物理化学过程，焊接接头各组成部分的成分、组织和性能都存在差异，同时还容易产生裂纹、气孔、夹杂和未熔合等焊接缺陷和较大的残余应力，使得焊接接头成为管道工程中的薄弱环节。在服役介质中，焊接接头存在宏观腐蚀电池与微观腐蚀电池耦合的多相电化学反应而引起局部腐蚀，可能导致整个构件失效，引发严重的安全事故，造成重大的经济损失甚至人身伤亡。利用 COMSOL Multiphysics® 多物理场仿真软件的腐蚀模块和二次电流分布接口对 X80 钢焊接接头在 CO2 饱和的 NACE 溶液中的电流密度及电位分布进行了仿真，并利用参数化扫描功能，模拟了焊缝与母材不同比例条件下的腐蚀行为。（图1）、（图2）、（图3）和（图4）分别为焊缝：母材=1:3和1:8条件下焊接接头在 NACE 溶液中的电流密度和电位分布 ...
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 ...