在使用三角电压循环的动态操作过程中,斜率对质子交换膜电解水耐久性的影响

Hye Young Jung, Yong Seok Jun, Kwan-Young Lee, Hyun S. Park, Sung Ki Cho, Jong Hyun Jang
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摘要

质子交换膜水电解法(PEMWE)是一种利用风能和太阳能等可再生能源生产绿色氢气的有效方法。对于以可再生能源为动力的质子交换膜水电解法来说,其耐用性是影响其性能的关键因素,因为可再生能源(尤其是风能)的不规则和波动特性会降低质子交换膜水电解法的稳定性。三角电压周期能够很好地模拟波动的风力发电,但其对耐用性的影响尚未得到广泛研究。在本研究中,研究了在不同升压速率下三角电压循环运行的 PEMWE 电池的性能退化情况。在两种升压速率下,循环过程中测得的电流响应逐渐减小,循环前后的 I-V 曲线测量证实了 PEMWE 的性能退化。在这两次测量中,300 mV s -1 的衰减率大于 30 mV s -1 的衰减率,在升压速率为 30 mV s -1 和 300 mV s -1 时,衰减率分别为 0.36 和 1.26 mV h -1 (电流密度为 2 A cm -2 时)。与其他三角电压循环研究的比较也表明,升压速率的增加会加速 PEMWE 性能的恶化。X 射线光电子能谱和透射电子显微镜结果表明,在电压循环过程中,Ir 催化剂被氧化,但没有溶解。这项研究表明,三角电压循环的斜率是评估 PEMWE 电池耐用性的一个重要因素。
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Effect of Ramping Rate on the Durability of Proton Exchange Membrane Water Electrolysis During Dynamic Operation Using Triangular Voltage Cycling
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.
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