On efficiency of both single fuel cells and stacks I

Dante, Roberto C.; Lehmann, Jochen; Solorza-Feria, Omar
March 2005
Journal of Applied Electrochemistry;Mar2005, Vol. 35 Issue 3, p327
Academic Journal
A method to estimate the efficiency of a stack of several identical cells is described on the basis of the electrochemical behavior of a single cell. Efficiency of fuel cell stacks is defined by means of a combination of semi-empirical models of polarization curves and dimensionless variables such as reaction extent and utilization. The connection of flows among the cells is basically divided in two extreme cases and one intermediate case. Higher efficiencies are obtained when the same main flow (both anodic and cathodic) passes consecutively through the stack cells (Chain Flow), because it is favored thermodynamically. It is less favored when the main flow is strictly divided among all the cells (Separate Flow). In the intermediate case, the main flow is divided among all the stack cells and all the outlets are collected in one flow. The latter can spontaneously evolve to the more thermodynamically stable behavior of Chain Flow.


Related Articles

  • Tree network channels as fluid distributors constructing double-staircase polymer electrolyte fuel cells. Senn, S.M.; Poulikakos, D. // Journal of Applied Physics;7/1/2004, Vol. 96 Issue 1, p842 

    In this article, constructal tree-like channel networks are introduced as a fuel cell fluid distribution concept, which also optimizes the shape of polymer electrolyte fuel cells. This concept is the main contribution of the article. To perform quantitative calculations based on this concept, a...

  • Polarization characteristics and property distributions of a proton exchange membrane fuel cell under cathode starvation conditions. Dongsoo Ko; Youngmin Kang; Jangsik Yang; Jihwan Jeong; Gyungmin Choi; Duckjool Kim // International Journal of Energy Research;Aug2010, Vol. 34 Issue 10, p865 

    Property distribution and polarization characteristics of a proton exchange membrane fuel cell (PEMFC) under cathode starvation conditions were investigated numerically and experimentally for a unit cell. The polarization curves of a lab-scale PEMFC were measured with increasing current density...

  • Effect of ambient conditions on performance and current distribution of a polymer electrolyte membrane fuel cell. Fiottinen, T.; Noponen, M.; Mennola, T.; Himanen, O.; Mikkola, M.; Lund, P. // Journal of Applied Electrochemistry;Mar2003, Vol. 33 Issue 3/4, p265 

    The performance and current distribution of a free-breathing polymer electrolyte membrane fuel cell (PEMFC) was studied experimentally in a climate chamber, in which temperature and relative humidity were controlled. The performance was studied by simulating ambient conditions in the temperature...

  • H2/Cl2 fuel cell for co-generation of electricity and HCl. Thomassen, M.; Børresen, B.; Hagen, G.; Tunold, R. // Journal of Applied Electrochemistry;Jan2003, Vol. 33 Issue 1, p9 

    A H2/Cl2 fuel cell system with an aqueous electrolyte and gas diffusion electrodes has been investigated and the effects of electrolyte concentration and temperature on the open circuit voltage (OCV) and cell performance have been evaluated. Furthermore, the kinetics and long-term stability of...

  • Theoretical Energy and Exergy Analyses of Proton Exchange Membrane Fuel Cell by Computer Simulation. Gimba, I. D.; Abdulkareem, A. S.; Jimoh, A.; Afolabi, A. S. // Journal of Applied Chemistry (2356-7171);9/18/2016, p1 

    A mathematical model of a proton exchange membrane fuel cell (PEMFC) was developed to investigate the effects of operating parameters such as temperature, anode and cathode pressures, reactants flow rates, membrane thickness, and humidity on the performance of the modelled fuel cell. The...

  • Fuel-Cell Finish. Iovine, John // Poptronics;Jun2001, Vol. 2 Issue 6, p47 

    Discusses steps in constructing fuel cells that generate electricity from chemical action. Materials needed; Hydrogen gas production; Use of yeast to generate power; Fuel cell battery design; Microbial fuel cell kit.

  • Solid-oxide fuel cells set output record.  // R&D Magazine;Dec95, Vol. 37 Issue 13, p15 

    Reports on the record energy output of a fuel-cell stack for use in power-generation plants, developed by a Siemens Corp. research team in Erlangen, Germany. Stack's arrangement in window configuration; Operating temperature.

  • Preparing for the hard cell. Varley, James // Modern Power Systems;Jan2000, Vol. 20 Issue 1, p19 

    Predicts the growth of fuel cell development projects in the 21st century. Discovery of principle behind the technology in 1839; Development of fuel cells by United Technologies Corp.'s subsidiary International Fuel Cells; Necessity of reducing the price of fuel cells to enable wider...

  • SENSORS COULD IMPROVE FUEL-CELL MODELS.  // Machine Design;2/3/2005, Vol. 77 Issue 3, p22 

    Reports on miniature optical sensors developed at Oak Ridge National Laboratory (ORNL) in Tennessee which could speed the development of fuel cells to power vehicles, buildings and machines. Key to the success of the ORNL sensors; Advantage of the sensors on developers of proton-exchange...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics