Journal
MEMBRANES
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/membranes11110822
Keywords
two-phase flow; cell orientation; single serpentine; quintuple serpentine; bubble coverage; water electrolysis; operating temperature; flow rate; channel pattern
Categories
Funding
- National R&D Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [NRF-2019M3E6A1064703, 2020M1A2A2080880]
- Korea Evaluation Institute of Industrial Technology (KEIT) - Ministry of Trade, Industry and Energy [20009835]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20009835] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2019M3E6A1064703] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study investigated the factors leading to the performance degradation of proton exchange membrane water electrolysis, including operating temperature, flow rate, cell orientation, and channel pattern. The results showed that increasing the operating temperature and reducing the flow rate can improve the performance of PEMWE, and the variation in cell orientation also affects its efficiency.
Water electrolysis is an eco-friendly method for the utilization of renewable energy sources which provide intermittent power supply. Proton exchange membrane water electrolysis (PEMWE) has a high efficiency in this regard. However, the two-phase flow of water and oxygen at the anode side causes performance degradation, and various operating conditions affect the performance of PEMWE. In this study, the effects of four control parameters (operating temperature, flow rate, cell orientation, and pattern of the channel) on the performance of PEMWE were investigated. The effects of the operating conditions on its performance were examined using a 25 cm(2) single-cell. Evaluation tests were conducted using in situ methods such as polarization curves and electrochemical impedance spectroscopy. The results demonstrated that a high operating temperature and low flow rate reduce the activation and ohmic losses, and thereby enhance the performance of PEMWE. Additionally, the cell orientation affects the performance of PEMWE owing to the variation in the two-phase flow regime. It was observed that the slope of specific sections in the polarization curve rapidly increases at a specific cell voltage.
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