Journal of Fuel Cell Science and Technology最新文献_第7页

Lattice Boltzmann Modeling of Water Cumulation at the Gas Channel-Gas Diffusion Layer Interface in Polymer Electrolyte Membrane Fuel Cells 聚合物电解质膜燃料电池气通道-气体扩散层界面水积累的晶格玻尔兹曼模型

Journal of Fuel Cell Science and Technology Pub Date : 2014-12-01 DOI: 10.1115/1.4028952

D. Maggiolo, A. Marion, M. Guarnieri

{"title":"Lattice Boltzmann Modeling of Water Cumulation at the Gas Channel-Gas Diffusion Layer Interface in Polymer Electrolyte Membrane Fuel Cells","authors":"D. Maggiolo, A. Marion, M. Guarnieri","doi":"10.1115/1.4028952","DOIUrl":"https://doi.org/10.1115/1.4028952","url":null,"abstract":"Several experiments have proved that water in liquid phase can be present at the anode of a PEM fuel cell due to vapor condensation resulting in mass transport losses. Nevertheless, it is not yet well understood where exactly water tends to cumulate and how the design of the gas channel (GC) and gas diffusion layer (GDL) could be improved to limit water cumulation. In the present work, a three-dimensional lattice Boltzmann based model is implemented in order to simulate the water cumulation at the GC–GDL interface at the anode of a PEM fuel cell. The numerical model incorporates the H 2 –H 2 O mixture equation of state and spontaneously simulates phase separation phenomena. Different simulations are carried out varying pressure gradient, pore size, and relative height of the GDL. Results reveal that, once saturation conditions are reached, water tends to cumulate in two main regions: the upper and side walls of the GC and the GC–GDL interface, resulting in a limitation of the reactant diffusion from the GC to the GDL. Interestingly, the cumulation of liquid water at the interface is found to diminish as the relative height of the GDL increases.","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"11 1","pages":"061008"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4028952","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63487840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Design Approach for the Development of the Flow Field of Bipolar Plates for a PEMFC Stack Prototype PEMFC堆原型双极板流场发展的设计方法

Journal of Fuel Cell Science and Technology Pub Date : 2014-12-01 DOI: 10.1115/1.4028150

P. Sala, P. G. Stampino, G. Dotelli

引用次数: 1

Effects of Operating Conditions on Direct Methanol Fuel Cell Performance Using Nafion-Based Polymer Electrolytes 使用钠基聚合物电解质的操作条件对直接甲醇燃料电池性能的影响

Journal of Fuel Cell Science and Technology Pub Date : 2014-12-01 DOI: 10.1115/1.4028611

S. Lue, W. Hsu, Chen Chao, K. Mahesh

引用次数: 2

Energy-saving evaluation of sofc cogeneration systems with solar cell and battery 太阳能电池/蓄电池sofc热电联产系统的节能评价

Journal of Fuel Cell Science and Technology Pub Date : 2014-12-01 DOI: 10.1115/1.4028948

Akira Yoshida, Koichi Ito, Y. Amano

引用次数: 3

Parametric Sensitivity Tests—European Polymer Electrolyte Membrane Fuel Cell Stack Test Procedures 参数灵敏度测试-欧洲聚合物电解质膜燃料电池堆测试程序

Journal of Fuel Cell Science and Technology Pub Date : 2014-12-01 DOI: 10.1115/1.4028949

Samuel Simon Araya, S. J. Andreasen, S. Kær

引用次数: 8

The Comparisons of Electrical Performance and Impedance Spectrum for Two Commercial Cells 两种商用电池电性能和阻抗谱的比较

Journal of Fuel Cell Science and Technology Pub Date : 2014-10-01 DOI: 10.1115/1.4027394

Y. Cheng, Shih-Wei Cheng, Ruey‐yi Lee

引用次数: 4

Fuel Cell Diagnostics Using Identification Measurement Theory 利用识别测量理论进行燃料电池诊断

Journal of Fuel Cell Science and Technology Pub Date : 2014-10-01 DOI: 10.1115/1.4027395

K. Koshekov, Yu. N. Klikushin, V. Kobenko, Y. Evdokimov, A. Demyanenko

引用次数: 18

In Situ Observation of Deformation Behavior of Membrane Electrode Assembly Under Humidity Cycles 湿循环作用下膜电极组件变形行为的原位观察

Journal of Fuel Cell Science and Technology Pub Date : 2014-10-01 DOI: 10.1115/1.4028155

Yusuke Kai, Yukiya Kitayama, M. Omiya, T. Uchiyama, H. Kumei

{"title":"In Situ Observation of Deformation Behavior of Membrane Electrode Assembly Under Humidity Cycles","authors":"Yusuke Kai, Yukiya Kitayama, M. Omiya, T. Uchiyama, H. Kumei","doi":"10.1115/1.4028155","DOIUrl":"https://doi.org/10.1115/1.4028155","url":null,"abstract":"The mechanical reliability of the membrane electrode assembly (MEA) in polymer electrolyte fuel cells (PEFCs) is a major concern with respect to fuel cell vehicles. When PEFCs generate power, water is generated. The proton exchange membrane (PEM) swells in wet conditions and shrinks in dry conditions. These cyclic conditions induce mechanical stress in the MEA, and cracks are formed. Failure of the MEA can result in leaking of fuel gases and reduced output power. Therefore, it is necessary to determine the mechanical reliability of the MEA under various mechanical and environmental conditions. The purpose of the present paper is to observe the deformation behavior of the MEA under humidity cycles. We have developed a device in which the constrained condition of the GDL is modeled by carbon bars of 100 to 500 μm in diameter. The carbon bars are placed side by side and are pressed against the MEA. The device was placed in a temperature and humidity controlled chamber, and humidity cycles were applied to the specimen. During the tests, cross sections of the specimen were observed by microscope, and the strain was calculated based on the curvature of the specimen. The temperature in the test chamber was varied from 25 to 80 °C, and the relative humidity was varied from 50 to 100%RH, and the wet condition was also investigated. The results revealed that the MEA deformed significantly by swelling and residual deformation was observed under the dry condition, even for one humidity cycle. The crack formation criteria for one humidity cycle corresponded approximately with those of the static tensile tests. The results of the humidity cycle tests followed Coffin–Manson law, and the number of cycles until crack formation corresponded approximately with the results of the mechanical fatigue tests. These results will be valuable in the critical design of durable PEFCs.","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"11 1","pages":"051006"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4028155","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63486477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

In Situ and Ex Situ Studies on the Degradation of Pd/C Catalyst for Proton Exchange Membrane Fuel Cells 质子交换膜燃料电池Pd/C催化剂降解的原位和非原位研究

Journal of Fuel Cell Science and Technology Pub Date : 2014-10-01 DOI: 10.1115/1.4027708

Yongfu Tang, Shichun Mu, Sheng-xue Yu, Yufeng Zhao, Hongchao Wang, Faming Gao

引用次数: 6

Robotic Arm for Automated Assembly of Proton Exchange Membrane Fuel Cell Stacks 质子交换膜燃料电池堆自动装配机械臂

Journal of Fuel Cell Science and Technology Pub Date : 2014-10-01 DOI: 10.1115/1.4027392

Michael K. Williams, Kenneth Tignor, Luke Sigler, C. Rajagopal, V. Gurau

{"title":"Robotic Arm for Automated Assembly of Proton Exchange Membrane Fuel Cell Stacks","authors":"Michael K. Williams, Kenneth Tignor, Luke Sigler, C. Rajagopal, V. Gurau","doi":"10.1115/1.4027392","DOIUrl":"https://doi.org/10.1115/1.4027392","url":null,"abstract":"We present an innovative, inexpensive end-effector, the robot workcell, and the fuel cell components used to demonstrate the automated assembly process of a proton exchange membrane fuel cell stack. The end-effector is capable of handling a variety of fuel cell components including membrane electrode assemblies, bipolar plates and gaskets using vacuum cups mounted on level compensators and connected to a miniature vacuum pump. The end-effector and the fuel cell components are designed with features that allow an accurate component alignment during the assembly process within a tolerance of 0.02 in. and avoiding component overlapping which represents a major cause of overboard gas leaks during the fuel cell operation. The accurate component alignment in the stack is achieved with electrically nonconductive alignment pins permanently mounted on one fuel cell endplate and positioning holes machined on the fuel cell components and on the end-effector. The alignment pins feature a conical tip which eases the engagement between them and the positioning holes. A passive compliance system consisting of two perpendicularly mounted miniature linear blocks and rails allow compensating for the robot's limitations in accuracy and repeatability.","PeriodicalId":15829,"journal":{"name":"Journal of Fuel Cell Science and Technology","volume":"11 1","pages":"054501"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1115/1.4027392","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63484765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13