...Minh-Quy Le; Huu-Tu Nguyen; Thanh-Lam Bui We study through extensive finite element analysis the lithium diffusion in small elements of Si anodes under the forms of spheres, rods, and circular disks for Li-ion batteries. Elastoplastic properties of the amorphous silicon are assumed to be lithium...

... of about 102.5 mAh/g at a low current rate (C/20), which decreases to 36.75 mAh/g at a relatively higher rate (2C). The capacity retention at C/10 after 50 cycles is 85.7%. The evaluation of Na-ion diffusion coefficients (D Na+ ) in NMO is accomplished by potentiostatic intermittent titration technique...

... Stress-Enhanced Diffusion in Amorphous Lithium Alloy Nanowire Electrodes ,” J. Appl. Phys. , 109 ( 1 ), p. 014310 . 10.1063/1.3530738 [45] Gao , Y. F. , and Zhou , M. , 2013 , “ Coupled Mechano-Diffusional Driving Forces for Fracture in Electrode Materials ,” J. Power Sources , 230...

..., 2013; published online October 17, 2013. Assoc. Editor: Abel Hernandez. 28 06 2011 05 09 2013 In fuel cell systems with an anode recirculation cycle that runs overstoichiometrically, an undesired enrichment of nitrogen and water vapor occurs due to their diffusion through...

..., electrochemistry, electrical conduction, and diffusion physics. This model was built using the actual button cell testing geometry and using experimental data for validation purposes. The objective of this study is to understand the effects of the testing setup used on the cell performance and to recommend...

...Henning Severson; Mohsen Assadi In this paper results from a parameter study of an anode-supported solid oxide fuel cell (SOFC) are presented. The effects on performance, current-voltage (I-V) characteristics, polarization voltages, and diffusion coefficients are modeled for different temperatures...

... multifunctional efficiencies ranging from 22% to 69%. The higher efficiency was obtained by optimizing the contact pressure at the gas diffusion layer (GDL) in a model cell design. The efficiencies obtained suggest the need for improved multifunctional designs in order to reach system level mass savings. 04...

...Terry B. Caston; Kanthi L. Bhamidipati; Haley Carney; Tequila A. L. Harris The goal of this study is to design a gas diffusion layer (GDL) for a polymer electrolyte membrane (PEM) fuel cell with a graduated permeability and thereby graduating the resistance to flow throughout the GDL. It has been...

...Utku Gulan; Hasmet Turkoglu; Irfan Ar In this study, the fluid flow and cell performance in cathode side of a proton exchange membrane (PEM) fuel cell were numerically analyzed. The problem domain consists of cathode gas channel, cathode gas diffusion layer, and cathode catalyst layer...

...-dependent phenomena. Evaporation and capillarity were assumed to be the predominant mechanisms of water flow through the gas diffusion media. The innovative features of the model are not only to simulate the water transport inside the porous media with relative simplicity, but also to simulate the water...

... to simulate fluid flow at pore scale in porous materials. This work provides a description of how the two techniques have been adapted to simulate gas movement through a carbon paper gas diffusion layer (GDL). The validation work demonstrates that the difference between the simulated and measured absolute...

... diffusion oxygen reduction reaction Solid oxide fuel cells (SOFCs) are high temperature fuel cells that are composed of solid (ceramic and metal) materials and use oxygen ions ( O 2 − ) as the electrolytic ion. Electrolyte material is first determined by considering...

...Zhongying Shi; Xia Wang; Laila Guessous The gas diffusion layer (GDL) plays an important role in maintaining suitable water management in a proton exchange membrane fuel cell. The properties of the gas diffusion layer, such as its porosity, permeability, wettability, and thickness, are affected...

... by adjusting the liquid water saturation at the interface of the cathode gas diffusion layer and flow channels. channel flow diffusion electrochemical electrodes numerical analysis proton exchange membrane fuel cells proton exchange membrane fuel cell membrane electrolyte assembly water...

...Abhijit S. Joshi; Kyle N. Grew; John R. Izzo, Jr.; Aldo A. Peracchio; Wilson K. S. Chiu The lattice Boltzmann method (LBM) was used to study the three-dimensional (3D) mass diffusion of three species ( H 2 , H 2 O , and N 2 ) in the pore phase of a porous solid oxide fuel cell (SOFC) anode...

...J. D. Sole; M. W. Ellis; D. A. Dillard A promising type of proton exchange membrane fuel cell (PEMFC) architecture, the ribbon fuel cell, relies on the gas diffusion layer (GDL) to conduct electrical current in-plane to adjacent cells or collector terminals. The potential advantages of the fuel...

... relative humidity sensors embedded in the anode and cathode flow field plates. The effects of the relative humidity and stoichiometry of the cathode inlet on relative humidity distribution in the channels and on water accumulation in the gas diffusion layers (GDLs) were investigated in this study...

..., energy balance, and diffusion in the gas diffusion layer, reflecting a two-phase phenomenon of water. Major design parameters and an operating condition by conveying simulations have been changed to analyze sensitivity of the parameters on the performance, which is then compared with experimental results...

...Ming-San Lee; Long-Jeng Chen; Ting-Huai Chen A new hydrophobic micropillared structure for the electrode of a proton exchange membrane fuel cell (PEMFC) is proposed in this study. Its performance has a 40% increase over the conventional structured electrode. The new design changes the gas-diffusion...

...Kui Jiao; Biao Zhou Liquid water transport inside proton exchange membrane (PEM) fuel cells is one of the key challenges for water management in a PEM fuel cell. Investigation of the air-water flow patterns inside fuel cell gas flow channels with gas diffusion layer (GDL) would provide valuable...