Jung, Hye Young Jun, Yong Seok Lee, Kwan-Young Park, Hyun S. Cho, Sung Ki Jang, Jong Hyun 2024-05-30T09:30:35Z 2024-05-30T09:30:35Z 2024-05-30 2024-05 2093-8551 https://pubs.kist.re.kr/handle/201004/149965 Proton exchange membrane water electrolysis (PEMWE) is an efficient method for utilizing renewable energy sources such as wind and solar powers to produce green hydrogen. For PEMWE powered by renewable energy sources, its durability is a crucial factor in its performance since irregular and fluctuating characteristics of renewable energy sources, especially for wind power, can deteriorate the stability of PEMWE. Triangular voltage cycle is well able to simulate fluctuating wind power, but its effect on the durability has not been investigated extensively. In this study, the performance degradation of the PEMWE cell operated with the triangular voltage cycling was investigated at different ramping rates. The measured current responses during the cycling gradually decreased for both ramping rates, and I-V curve measurements before and after the cycling confirmed the degradation of the performances of PEMWE. For both measurements, the degradation rate was larger for 300 mV s(-1) than 30 mV s(-1), and they were determined as 0.36 and 1.26 mV h(-1) (at the current density of 2 A cm(-2)) at the ramping rates of 30 and 300 mV s(-1), respectively. The comparison with other studies on triangular voltage cycling also indicate that an increase in the ramping rate accelerates the deterioration of the PEMWE performance. X-ray photoelectron spectroscopy and transmission electron microscopy results showed that the Ir catalyst was oxidized and did not dissolve during the voltage cycling. This study suggests that the ramping rate of the triangular voltage cycling is an important factor for the evaluation of the durability of PEMWE cells. English The Korean Electrochemical Society Effect of Ramping Rate on the Durability of Proton Exchange Membrane Water Electrolysis During Dynamic Operation Using Triangular Voltage Cycling Article 10.33961/jecst.2023.00948 1 Journal of Electrochemical Science and Technology, v.15, no.2, pp.253 - 260 Journal of Electrochemical Science and Technology 15 2 253 260 Y scie scopus 001221768900007 2-s2.0-85192776978 Electrochemistry Electrochemistry Article IRIDIUM PERFORMANCE Polymer electrolyte membrane water electrolysis Degradation Triangular voltage cycling Ramping rate