Performance Improvement of PEM Fuel Cells Using Air Channel Indentation; Part I: Mechanisms to Enrich Oxygen Concentration in Catalyst Layer

نویسندگان

  • Mohammad Jafar Kermani Fuel Cell Laboratory, Energy Conversion Research Lab, Department of Mechanical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
چکیده مقاله:

A three dimensional, compressible, steady, one phase flow of reactant-product mixture in the air side electrode of proton exchange membrane fuel cell (PEMFC) is numerically studied in this paper. The mixture is composed of three species: oxygen, nitrogen and water vapor. The performance of the cell is enhanced by partial blockage of the flow field channels. Various types of these blocks also called as dents in this study are considered. Examples of the dent profile shapes are: square (labeled as SQ case in this paper), semicircle (or SC) and trapezoid (or TR), and the enhancements are compared with that of no dent (or ND) case. It is observed that channel indentation can enhance the content of oxygen concentration at the face of catalyst layer up to 18%. It is noted that the content of oxygen at the face of catalyst is the driving moment for the kinetics of reaction within the catalyst layer. Hence channel indentation can be considered as a proper mechanism to enhance the performance of fuel cells. In this paper only the increasing of driving moment is discussed and the analysis of net power enhancement will be discussed later in another paper.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

performance improvement of pem fuel cells using air channel indentation; part i: mechanisms to enrich oxygen concentration in catalyst layer

a three dimensional, compressible, steady, one phase flow of reactant-product mixture in the air side electrode of proton exchange membrane fuel cell (pemfc) is numerically studied in this paper. the mixture is composed of three species: oxygen, nitrogen and water vapor. the performance of the cell is enhanced by partial blockage of the flow field channels. various types of these blocks also ca...

متن کامل

Enhancement of PEM fuel cell performance by flow channel indentation

A three-dimensional, steady, single-phase flow of oxygen, nitrogen and water vapor mixture in the cathode of proton exchange membrane (PEM) fuel cell was numerically studied here. It was shown that the performance of the cell was enhanced by partial blockage of the flow channels in a parallel flow field. Since, channel indentation could increase oxygen content within the catalyst layer. It was ...

متن کامل

Reduced models for the cathode catalyst layer in PEM fuel cells

Abstract: We study a pore scale model for the catalyst layer on the cathode side of a fuel cell, where hydrogen and oxygen combine at catalyst sites. Our model distinguishes microscopically the phases of rigid structure, electrolyte, pore-space, and catalyst. The oxygen concentration and the protonic potential are described by diffusion equations with reaction terms on the catalyst’s surface. F...

متن کامل

Optimization of cathode catalyst layer for direct methanol fuel cells Part I. Experimental investigation

The cathode catalyst layer (CL) in direct methanol fuel cells (DMFCs) has been optimized through a balance of ionomer and porosity distributions, oth playing important roles in affecting proton conduction and oxygen transport through a thick CL of DMFC. The effects of fabrication rocedure, ionomer content, and Pt distribution on the microstructure and performance of a cathode CL under low air f...

متن کامل

Accurate Ex-situ Measurements of PEM Fuel Cells Catalyst Layer Dry Diffusivity

Polymer electrolyte membrane fuel cells (PEMFC) efficiently convert the reaction energy of hydrogen and oxygen to electricity, water and heat. The oxygen reduction reaction occurs in composite nanostructured catalyst layers (CL) formed from Pt nanoparticles supported on a network of carbon particle agglomerates. Oxygen reaches the reaction site through diffusion. Understanding the diffusion pro...

متن کامل

An Effective Computational Approach to the Parametric Study of the Cathode Catalyst Layer of PEM Fuel Cells

We propose an integrated modeling, prediction, and analysis framework for the parametric study of the cathode catalyst layer (CCL) of PEM fuel cells. A parametric study is performed on a macro-homogeneous film model of the CCL. An artificial neural network (ANN) is then used in order to model and predict the effect of various structural parameters on the activation overpotential of the CCL. The...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ذخیره در منابع من قبلا به منابع من ذحیره شده

{@ msg_add @}


عنوان ژورنال

دوره 1  شماره 4

صفحات  199- 207

تاریخ انتشار 2014-10-01

با دنبال کردن یک ژورنال هنگامی که شماره جدید این ژورنال منتشر می شود به شما از طریق ایمیل اطلاع داده می شود.

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023