Current-voltage characteristics and impedance analysis of solid oxide fuel cells for mixed H2 and CO gases

K. Sasaki; Y. Hori; R. Kikuchi; K. Eguchi; A. Ueno; H. Takeuchi; M. Aizawa; K. Tsujimoto; H. Tajiri; H. Nishikawa; Y. Uchidad

doi:10.1149/1.1435357

Current-voltage characteristics and impedance analysis of solid oxide fuel cells for mixed H₂ and CO gases

K. Sasaki, Y. Hori, R. Kikuchi, K. Eguchi, A. Ueno, H. Takeuchi, M. Aizawa, K. Tsujimoto, H. Tajiri, H. Nishikawa, Y. Uchidad

Hydrogen Utilization Engineering

Research output: Contribution to journal › Article › peer-review

74 Citations (Scopus)

Abstract

Current-voltage (I-V) characteristics and electrode impedance of a tubular-type solid oxide fuel cell (SOFC) were analyzed for mixed fuel gases, consisting mainly of CO, H₂, H₂O, and a carrier gas, as simulated reformed gas of hydrocarbons or coal gas. I-V characteristics of a single cell were measured as a function of various operational parameters including the H₂-to-CO ratio, the type of carrier gas such as He, N₂, and Ar, the temperature, the fuel-to-carrier gas ratio, and the water vapor concentration. It has been experimentally confirmed that the use of CO-rich gases results in comparable performance to that of H₂-rich gases and thus mixed gas such as coal gas is useful as a SOFC fuel. We have found, for the first time, that the I-V characteristics depend on the carrier gas, indicating the importance of gas transport in porous anodes for anodic polarization. The change in cell voltage by varying fuel compositions was mainly caused by the change in anode impedance associated with a low frequency semicircle in a Cole-Cole impedance plot at 1000°C. The fuel gas compositions in thermodynamic equilibrium were calculated and compared with the initial gas compositions, suggesting the importance of water vapor concentration to control the equilibrium H₂-to-CO ratio for CO-rich fuel gases.

Original language	English
Pages (from-to)	A227-A233
Journal	Journal of the Electrochemical Society
Volume	149
Issue number	3
DOIs	https://doi.org/10.1149/1.1435357
Publication status	Published - Mar 1 2002

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1149/1.1435357

Cite this

@article{495465bb81d947108a86eca135e001e1,

title = "Current-voltage characteristics and impedance analysis of solid oxide fuel cells for mixed H2 and CO gases",

abstract = "Current-voltage (I-V) characteristics and electrode impedance of a tubular-type solid oxide fuel cell (SOFC) were analyzed for mixed fuel gases, consisting mainly of CO, H2, H2O, and a carrier gas, as simulated reformed gas of hydrocarbons or coal gas. I-V characteristics of a single cell were measured as a function of various operational parameters including the H2-to-CO ratio, the type of carrier gas such as He, N2, and Ar, the temperature, the fuel-to-carrier gas ratio, and the water vapor concentration. It has been experimentally confirmed that the use of CO-rich gases results in comparable performance to that of H2-rich gases and thus mixed gas such as coal gas is useful as a SOFC fuel. We have found, for the first time, that the I-V characteristics depend on the carrier gas, indicating the importance of gas transport in porous anodes for anodic polarization. The change in cell voltage by varying fuel compositions was mainly caused by the change in anode impedance associated with a low frequency semicircle in a Cole-Cole impedance plot at 1000°C. The fuel gas compositions in thermodynamic equilibrium were calculated and compared with the initial gas compositions, suggesting the importance of water vapor concentration to control the equilibrium H2-to-CO ratio for CO-rich fuel gases.",

author = "K. Sasaki and Y. Hori and R. Kikuchi and K. Eguchi and A. Ueno and H. Takeuchi and M. Aizawa and K. Tsujimoto and H. Tajiri and H. Nishikawa and Y. Uchidad",

year = "2002",

month = mar,

day = "1",

doi = "10.1149/1.1435357",

language = "English",

volume = "149",

pages = "A227--A233",

journal = "Journal of the Electrochemical Society",

issn = "0013-4651",

publisher = "Electrochemical Society, Inc.",

number = "3",

}

TY - JOUR

T1 - Current-voltage characteristics and impedance analysis of solid oxide fuel cells for mixed H2 and CO gases

AU - Sasaki, K.

AU - Hori, Y.

AU - Kikuchi, R.

AU - Eguchi, K.

AU - Ueno, A.

AU - Takeuchi, H.

AU - Aizawa, M.

AU - Tsujimoto, K.

AU - Tajiri, H.

AU - Nishikawa, H.

AU - Uchidad, Y.

PY - 2002/3/1

Y1 - 2002/3/1

N2 - Current-voltage (I-V) characteristics and electrode impedance of a tubular-type solid oxide fuel cell (SOFC) were analyzed for mixed fuel gases, consisting mainly of CO, H2, H2O, and a carrier gas, as simulated reformed gas of hydrocarbons or coal gas. I-V characteristics of a single cell were measured as a function of various operational parameters including the H2-to-CO ratio, the type of carrier gas such as He, N2, and Ar, the temperature, the fuel-to-carrier gas ratio, and the water vapor concentration. It has been experimentally confirmed that the use of CO-rich gases results in comparable performance to that of H2-rich gases and thus mixed gas such as coal gas is useful as a SOFC fuel. We have found, for the first time, that the I-V characteristics depend on the carrier gas, indicating the importance of gas transport in porous anodes for anodic polarization. The change in cell voltage by varying fuel compositions was mainly caused by the change in anode impedance associated with a low frequency semicircle in a Cole-Cole impedance plot at 1000°C. The fuel gas compositions in thermodynamic equilibrium were calculated and compared with the initial gas compositions, suggesting the importance of water vapor concentration to control the equilibrium H2-to-CO ratio for CO-rich fuel gases.

AB - Current-voltage (I-V) characteristics and electrode impedance of a tubular-type solid oxide fuel cell (SOFC) were analyzed for mixed fuel gases, consisting mainly of CO, H2, H2O, and a carrier gas, as simulated reformed gas of hydrocarbons or coal gas. I-V characteristics of a single cell were measured as a function of various operational parameters including the H2-to-CO ratio, the type of carrier gas such as He, N2, and Ar, the temperature, the fuel-to-carrier gas ratio, and the water vapor concentration. It has been experimentally confirmed that the use of CO-rich gases results in comparable performance to that of H2-rich gases and thus mixed gas such as coal gas is useful as a SOFC fuel. We have found, for the first time, that the I-V characteristics depend on the carrier gas, indicating the importance of gas transport in porous anodes for anodic polarization. The change in cell voltage by varying fuel compositions was mainly caused by the change in anode impedance associated with a low frequency semicircle in a Cole-Cole impedance plot at 1000°C. The fuel gas compositions in thermodynamic equilibrium were calculated and compared with the initial gas compositions, suggesting the importance of water vapor concentration to control the equilibrium H2-to-CO ratio for CO-rich fuel gases.

UR - http://www.scopus.com/inward/record.url?scp=0036503154&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036503154&partnerID=8YFLogxK

U2 - 10.1149/1.1435357

DO - 10.1149/1.1435357

M3 - Article

AN - SCOPUS:0036503154

SN - 0013-4651

VL - 149

SP - A227-A233

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

IS - 3

ER -