Abstract
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 cm2 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.
Highlights
Renewable energy conversion systems, such as photovoltaic systems and wind turbines, have received extensive attention
The results demonstrated that a high operating temperature and low flow rate reduce the activation and ohmic losses, and thereby enhance the performance of Proton exchange membrane water electrolysis (PEMWE)
The cell orientation affects the performance of PEMWE owing to the variation in the two-phase flow regime
Summary
Renewable energy conversion systems, such as photovoltaic systems and wind turbines, have received extensive attention. Proton exchange membrane water electrolysis (PEMWE) is a suitable method for the utilization of renewable energy because its transient response occurs within approximately 50 ms. This characteristic is favorable when the input power is intermittent [6]. A two-phase flow of the supplied water (liquid) and oxygen (gas) exists at the anode side This two-phase flow regime affects the performance of PEMWE. It is crucial to evaluate the performance of PEMWE depending on the change in the two-phase flow regime and the operating conditions. The performance of PEMWE was evaluated based on the effects of various operating conditions and the two-phase flow regime. The change in the slope of the polarization curve at a particular voltage was identified
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