Abstract
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.
| Original language | English (US) |
|---|---|
| Journal | International Journal of Energy Research |
| DOIs | |
| State | Published - Jan 1 2019 |
Fingerprint
Keywords
- internal current
- local current density
- proton exchange membrane fuel cell (PEMFC)
- startup and shutdown
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering
- Fuel Technology
- Energy Engineering and Power Technology
Cite this
Dynamic characteristics of internal current during startups/shutdowns in proton exchange membrane fuel cells. / Jia, Fei; Guo, Liejin; Liu, Hongtan.
In: International Journal of Energy Research, 01.01.2019.Research output: Contribution to journal › Article
}
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
PY - 2019/1/1
Y1 - 2019/1/1
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
UR - http://www.scopus.com/inward/record.url?scp=85063992340&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85063992340&partnerID=8YFLogxK
U2 - 10.1002/er.4537
DO - 10.1002/er.4537
M3 - Article
AN - SCOPUS:85063992340
JO - International Journal of Energy Research
JF - International Journal of Energy Research
SN - 0363-907X
ER -