Performance loss due to gas coverage on catalyst surface in polymer electrolyte membrane electrolysis cell

IF 15 1区 工程技术 Q1 ENERGY & FUELS
Daniela Fernanda Ruiz Diaz, Yun Wang
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引用次数: 0

Abstract

In this study, we carry out a fundamental and modeling study to investigate, for the first time, the gas coverage at the catalyst surface and its impacts on performance loss in polymer electrolyte membrane electrolysis cells (PEMECs). Oxygen, produced in the anode catalyst layer (CL) through the oxygen evolution reaction (OER), is removed via the pore network of the anode CL and porous transport layer (PTL) to the flow field. Oxygen gas bubbles can cover the catalyst surface and reduce the area for catalyst OER activity and hence cell performance. To investigate the oxygen bubbles’ impact, we consider various degrees of gas coverage and temperatures (25 °C, 80 °C, and 95 °C) in the range of current density from 0 to 7 A/cm2. We also, for the first time, elucidate the impacts of CL’s material properties on gas coverage morphology in the nano/micropores of CLs. Analytical solutions are derived for the gas fraction and gas composition at different temperatures and pressures. It was found that the gas fraction can be as high as 85% with water vapor contributing to 71% of the total gas coverage when operating at 95 °C and 1 atm. The modeling results indicate the gas coverage can contribute 57% of the total overpotential at 95 °C, 7 A/cm2, and a coverage coefficient of 7. The work contributes to a fundamental understanding of the impacts of two-phase phenomena on PEMEC performance and is valuable for catalyst layer design and optimization.

聚合物电解质膜电解电池中催化剂表面气体覆盖造成的性能损失
在这项研究中,我们进行了基础和建模研究,首次调查了催化剂表面的气体覆盖及其对聚合物电解质膜电解电池(PEMECs)性能损失的影响。在阳极催化剂层(CL)中通过析氧反应(OER)产生的氧,通过阳极催化剂层(CL)的孔隙网络和多孔输运层(PTL)被转移到流场。氧气气泡可以覆盖催化剂表面,减少催化剂OER活性的面积,从而降低电池性能。为了研究氧气气泡的影响,我们考虑了不同程度的气体覆盖和温度(25°C, 80°C和95°C),电流密度从0到7 A/cm2。我们还首次阐明了CL的材料性质对CL纳米/微孔中气体覆盖形貌的影响。在不同温度和压力下,导出了气体馏分和气体成分的解析解。结果表明,在95°C和1atm的温度下,水蒸气占总气体覆盖率的71%,气体分数可高达85%。模拟结果表明,在95℃,7 A/cm2,覆盖系数为7时,天然气覆盖占总过电位的57%。这项工作有助于从根本上理解两相现象对PEMEC性能的影响,对催化剂层的设计和优化具有重要价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Etransportation
Etransportation Engineering-Automotive Engineering
CiteScore
19.80
自引率
12.60%
发文量
57
审稿时长
39 days
期刊介绍: eTransportation is a scholarly journal that aims to advance knowledge in the field of electric transportation. It focuses on all modes of transportation that utilize electricity as their primary source of energy, including electric vehicles, trains, ships, and aircraft. The journal covers all stages of research, development, and testing of new technologies, systems, and devices related to electrical transportation. The journal welcomes the use of simulation and analysis tools at the system, transport, or device level. Its primary emphasis is on the study of the electrical and electronic aspects of transportation systems. However, it also considers research on mechanical parts or subsystems of vehicles if there is a clear interaction with electrical or electronic equipment. Please note that this journal excludes other aspects such as sociological, political, regulatory, or environmental factors from its scope.
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