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Rafat Mohammadi

Rafat Mohammadi

Academic rank: Associate Professor
ORCID: https://orcid.org/0000-0003-3675-4851
Education: PhD.
ScopusId: 6601987496
Faculty: Engineering
Address: Arak University
Phone:

Research

Title
A comprehensive simulation of gas concentration impedance for solid oxide fuel cell anodes
Type
JournalPaper
Keywords
Solid oxide fuel cell Electrochemical impedance spectroscopy Impedance modeling Concentration impedance Anode
Year
2015
Journal Energy Conversion and Management
DOI
Researchers Rafat Mohammadi ، Milad Fadayi

Abstract

This paper presents electrochemical impedance simulation of a solid oxide fuel cell anode. The model takes in to account the gas-phase transport processes both in the gas channel and within the porous electrode and couples the gas transport processes with the electrochemical kinetics. The gas phase mass transport is modeled using the transient conservation equations (mass, momentum and species equations) and Butler–Volmer equation is used for the anode electrochemistry. In order to solve the system of non linear equations, an in-house code based on the finite volume method is developed and utilized. Results show a depressed semicircle in the Nyquist plot, which originates from gas transport processes in the gas channel, in addition to a Warburg diffusion impedance originates from gas transport in the thick porous anode. The simulation results are in good agreement with published experimental data.