{"title":"ORR Enhancement Using Core-Shell Copt Magnetic Nanoparticles In Cathode Electrode Of Pemfcs","authors":"Jihyun Kim, W. Yang, Yongchan Kim","doi":"10.11159/htff22.149","DOIUrl":null,"url":null,"abstract":"Polymer electrolyte membrane fuel cells (PEMFCs) have attracted great attention as a power source for automotive industry owing to their eco-friendly characteristics and high energy efficiency. The most important issues for the commercialization of PEMFCs are the high cost of Pt which is used as catalysts in PEMFCs and the slow oxygen reduction reaction (ORR) speed in a cathode catalyst layer. Platinum group metals (PGMs) contribute to 21–45% of the total cost in a PEMFC stack [1]. Pt-M alloys have been studied to solve the issues by reducing Pt loading and enhancing PEMFC performance. Especially, among the alloys, a core-shell CoPt has very high surface reactivity which increases reaction speed [2]. Meanwhile, the application of a magnetic field to ORR catalysts has been investigated to increase ORR speed. Enhancement of catalyst reactivity in a magnetic field was due to paramagnetic oxygen which is attracted to magnetic poles. Catalyst reactivity was enhanced in a magnetic field regardless of the pole direction. Okada et al. [3] reported that a PEMFC with magnetized Nd-Fe-B microparticles in a catalyst layer showed better performance than that with not magnetized Nd-Fe-B microparticles. Therefore, magnetized core-shell CoPt nanoparticles have a great potential for the performance improvement of PEMFCs, but related research is very limited. In this study, the effect of magnetization on the","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.11159/htff22.149","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Polymer electrolyte membrane fuel cells (PEMFCs) have attracted great attention as a power source for automotive industry owing to their eco-friendly characteristics and high energy efficiency. The most important issues for the commercialization of PEMFCs are the high cost of Pt which is used as catalysts in PEMFCs and the slow oxygen reduction reaction (ORR) speed in a cathode catalyst layer. Platinum group metals (PGMs) contribute to 21–45% of the total cost in a PEMFC stack [1]. Pt-M alloys have been studied to solve the issues by reducing Pt loading and enhancing PEMFC performance. Especially, among the alloys, a core-shell CoPt has very high surface reactivity which increases reaction speed [2]. Meanwhile, the application of a magnetic field to ORR catalysts has been investigated to increase ORR speed. Enhancement of catalyst reactivity in a magnetic field was due to paramagnetic oxygen which is attracted to magnetic poles. Catalyst reactivity was enhanced in a magnetic field regardless of the pole direction. Okada et al. [3] reported that a PEMFC with magnetized Nd-Fe-B microparticles in a catalyst layer showed better performance than that with not magnetized Nd-Fe-B microparticles. Therefore, magnetized core-shell CoPt nanoparticles have a great potential for the performance improvement of PEMFCs, but related research is very limited. In this study, the effect of magnetization on the
聚合物电解质膜燃料电池(PEMFCs)作为一种环保、高能效的汽车动力源受到了广泛的关注。影响PEMFCs商业化的最重要的问题是用作PEMFCs催化剂的Pt的高成本和阴极催化剂层中氧还原反应(ORR)速度慢。铂族金属(PGMs)占PEMFC堆叠总成本的21-45%。Pt- m合金的研究旨在通过降低Pt负载和提高PEMFC性能来解决这些问题。其中,核壳型CoPt具有很高的表面反应活性,提高了反应速度。同时,研究了在ORR催化剂上施加磁场以提高ORR速度的方法。催化剂在磁场中的反应性增强是由于顺磁性氧被磁极吸引。在磁场作用下,催化剂的反应活性增强,而与磁极方向无关。Okada et al.[3]报道在催化剂层中磁化Nd-Fe-B微粒的PEMFC比未磁化Nd-Fe-B微粒的PEMFC表现出更好的性能。因此,磁化的核壳CoPt纳米颗粒在提高PEMFCs性能方面具有很大的潜力,但相关的研究非常有限。在本研究中,研究了磁化强度对材料的影响