{"title":"Effects of porosity and porosity distribution in gas diffusion layer on the performances of proton exchange membrane fuel cell","authors":"Shuang-Yan Jing, Z.Y. Sun, Liu Yang, Yang Wang","doi":"10.1016/j.jpowsour.2024.234957","DOIUrl":null,"url":null,"abstract":"The transmission capability of the gas diffusion layer directly impacts electrochemical reaction and water drainage, consequently, the comprehensive performance and lifetime of the proton exchange membrane fuel cell. The gas diffusion layer's porosity and distribution must be designed effectively as a porous component. This study focuses on experimentally validated models to investigate the effects of porosity and distribution in the gas diffusion layer using three-dimensional numerical simulation. A porosity of 0.6, with a unitary distribution, provides comprehensive improvements in power density while minimizing pressure drops. Additionally, four different distribution patterns of porosity (28 cases) are studied while maintaining an overall porosity of 0.6. The linear porosity distribution (along the flow path) with positive slopes outperforms the alternant distribution due to the cumulative effects on the micro-subsection of the gas diffusion layer. The stepped and/or the sinusoidal distribution can also improve the performances, but just when the step gradient and/or the amplitude are sufficiently small. The adverse effects on the uniformity of current density cause the sinusoidal distribution to be inferior to linear and stepped distribution patterns. The transmission of oxygen significantly affects the dynamic performances, with the distribution patterns of porosity critically influencing sensitivity.","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Power Sources","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.jpowsour.2024.234957","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The transmission capability of the gas diffusion layer directly impacts electrochemical reaction and water drainage, consequently, the comprehensive performance and lifetime of the proton exchange membrane fuel cell. The gas diffusion layer's porosity and distribution must be designed effectively as a porous component. This study focuses on experimentally validated models to investigate the effects of porosity and distribution in the gas diffusion layer using three-dimensional numerical simulation. A porosity of 0.6, with a unitary distribution, provides comprehensive improvements in power density while minimizing pressure drops. Additionally, four different distribution patterns of porosity (28 cases) are studied while maintaining an overall porosity of 0.6. The linear porosity distribution (along the flow path) with positive slopes outperforms the alternant distribution due to the cumulative effects on the micro-subsection of the gas diffusion layer. The stepped and/or the sinusoidal distribution can also improve the performances, but just when the step gradient and/or the amplitude are sufficiently small. The adverse effects on the uniformity of current density cause the sinusoidal distribution to be inferior to linear and stepped distribution patterns. The transmission of oxygen significantly affects the dynamic performances, with the distribution patterns of porosity critically influencing sensitivity.
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems