TY - JOUR
T1 - The effect of overpotentials on the transient response of the 300W SOFC cell stack voltage
AU - Komatsu, Y.
AU - Brus, G.
AU - Kimijima, S.
AU - Szmyd, J. S.
N1 - Funding Information:
The present work was financially supported by the Polish National Centre for Research and Development (Project HTRPL, Contract No. SP/J/1/166183/12) and by the Grants-in-Aid for Scientific Research of Japan (Project No. 23561034).
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2014/2/15
Y1 - 2014/2/15
N2 - This paper presents the results of an experimental investigation of transient characterizations of 300. W planar type Solid Oxide Fuel Cell (SOFC) cell stack during load change. It indicates the transient characterization obtained during a ramped electric current with a Current-Based Fuel Control (CBFC) strategy. The fuel utilization factor is chosen for a reference of the CBFC strategy and is kept constant to the ramping electric current. The fuel utilization factor can be described as a ratio of consumed fuel (expressed as a function with an applied electric current) to supplied fuel. For the simplification of discussion, hydrogen was used as fuel by mixing it with nitrogen in order to satisfy the constant gas residential time in all cases and instances. The transient response of the cell voltage obtained under several thermal conditions was shown for discussion. The effect of overpotentials, associated with the cell's operating temperature, on the transient response of the cell voltage is primarily discussed. The paper indicates that reducing the fuel flow rate, namely, setting a higher set-point for the fuel utilization factor, may decrease the OCV, increase concentration polarization and finally degrade cell performance. This paper also pointed out the importance of operating temperature management on both improving the steady-state cell performance and eliminating the negative effect of the overpotentials that appear on the transient response of the cell voltage.
AB - This paper presents the results of an experimental investigation of transient characterizations of 300. W planar type Solid Oxide Fuel Cell (SOFC) cell stack during load change. It indicates the transient characterization obtained during a ramped electric current with a Current-Based Fuel Control (CBFC) strategy. The fuel utilization factor is chosen for a reference of the CBFC strategy and is kept constant to the ramping electric current. The fuel utilization factor can be described as a ratio of consumed fuel (expressed as a function with an applied electric current) to supplied fuel. For the simplification of discussion, hydrogen was used as fuel by mixing it with nitrogen in order to satisfy the constant gas residential time in all cases and instances. The transient response of the cell voltage obtained under several thermal conditions was shown for discussion. The effect of overpotentials, associated with the cell's operating temperature, on the transient response of the cell voltage is primarily discussed. The paper indicates that reducing the fuel flow rate, namely, setting a higher set-point for the fuel utilization factor, may decrease the OCV, increase concentration polarization and finally degrade cell performance. This paper also pointed out the importance of operating temperature management on both improving the steady-state cell performance and eliminating the negative effect of the overpotentials that appear on the transient response of the cell voltage.
KW - Cell stack
KW - Current-based fuel control
KW - Fuel utilization factor
KW - Solid oxide fuel cells
KW - Transient characterization
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U2 - 10.1016/j.apenergy.2013.11.017
DO - 10.1016/j.apenergy.2013.11.017
M3 - Article
AN - SCOPUS:84888800324
SN - 0306-2619
VL - 115
SP - 352
EP - 359
JO - Applied Energy
JF - Applied Energy
ER -