TY - JOUR
T1 - Dynamic characteristics of internal current during startups/shutdowns in proton exchange membrane fuel cells
AU - Jia, Fei
AU - Guo, Liejin
AU - Liu, Hongtan
N1 - Funding Information:
National Natural Science Foundation of China, Grant/Award Number: 51606137; Natural Science Basic Research Plan in Shaanxi Province of China, Grant/Award Number: 2017JQ5022; China Postdoctoral Science Foundation, Grant/Award Num ber: 2016M600766
Funding Information:
This work was supported by the National Natural Science Foundation of China (no. 51606137), the China Postdoctoral Science Foundation (no. 2016M600766), and the Natural Science Basic Research Plan in Shaanxi Province of China (no. 2017JQ5022).
Publisher Copyright:
© 2019 John Wiley & Sons, Ltd.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/6/25
Y1 - 2019/6/25
N2 - Studying dynamic characteristics of proton exchange membrane fuel cells (PEMFCs) during startups/shutdowns is of great importance to proposing strategies to improve fuel cell performance and durability. In this study, internal current during startup and shutdown processes in PEMFC is investigated, and effects of gas supply/shutoff sequences and backpressure are analyzed by measuring local current densities and the cell voltage in situ. The experimental results show that when reactants were fed/shut off, internal current occurs and variation patterns of local current densities along the flow channel are different. During startups, local current densities in the downstream drop to negative values and internal current can be eliminated when air is first supplied into the cell. While during shutdowns, the results show that negative currents occur in the upstream, and if hydrogen is shut off first, all local current densities remain constant at zero, indicating the effectiveness of gas shutoff sequence in eliminating/mitigating internal current in PEM fuel cells. Further experimental results show that the magnitude of internal current increases with the pressure difference between the anode and the cathode.
AB - Studying dynamic characteristics of proton exchange membrane fuel cells (PEMFCs) during startups/shutdowns is of great importance to proposing strategies to improve fuel cell performance and durability. In this study, internal current during startup and shutdown processes in PEMFC is investigated, and effects of gas supply/shutoff sequences and backpressure are analyzed by measuring local current densities and the cell voltage in situ. The experimental results show that when reactants were fed/shut off, internal current occurs and variation patterns of local current densities along the flow channel are different. During startups, local current densities in the downstream drop to negative values and internal current can be eliminated when air is first supplied into the cell. While during shutdowns, the results show that negative currents occur in the upstream, and if hydrogen is shut off first, all local current densities remain constant at zero, indicating the effectiveness of gas shutoff sequence in eliminating/mitigating internal current in PEM fuel cells. Further experimental results show that the magnitude of internal current increases with the pressure difference between the anode and the cathode.
KW - internal current
KW - local current density
KW - proton exchange membrane fuel cell (PEMFC)
KW - startup and shutdown
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U2 - 10.1002/er.4537
DO - 10.1002/er.4537
M3 - Article
AN - SCOPUS:85063992340
VL - 43
SP - 3768
EP - 3778
JO - International Journal of Energy Research
JF - International Journal of Energy Research
SN - 0363-907X
IS - 8
ER -