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An Experimental Study of Wettability Control of Vanadium Oxide Thin Films on Stainless Steel Bipolar Plates for Enhanced Cold-start Capability and Water Repellency of Fuel Cells

Title
An Experimental Study of Wettability Control of Vanadium Oxide Thin Films on Stainless Steel Bipolar Plates for Enhanced Cold-start Capability and Water Repellency of Fuel Cells
Other Titles
연료전지 냉시동성 및 발수성 향상을 위한 분리판 표면 바나듐 산화물 박막의 습윤성 제어에 관한 실험적 연구
Author
박준성
Advisor(s)
Sukkee Um
Issue Date
2016-02
Publisher
한양대학교
Degree
Master
Abstract
ABSTRACT An Experimental Study of Wettability Control of Vanadium Oxide Thin Films on Stainless Steel Bipolar Plates for Enhanced Cold-start Capability and Water Repellency of Fuel Cells Jun Seong PARK Dept. of mechanical engineering The Graduate School Hanyang University Water management of polymer electrolyte fuel cell (PEFC) remains a major challenge for automotive applications because it has a deep affinity with performance of vehicles. For automotive applications, start-up of PEFC from sub-zero temperatures, known as cold-start is also an important research topic regarding performance and reliability of fuel cell vehicles. In this work we experimentally study the surface wettability of composite NTC thin films is of great importance to modify the surface characteristics between hydrophobicity and hydrophilicity of metallic substrates for advanced fuel cell applications, particularly for multi-functional metallic bipolar plates. Vanadium oxide films deposited on the flat surface of 316L stainless steel to investigate the hydrophobicity of the nanostructured thin films with organic solvent. Vanadium-based thin films on the surface of 316L stainless steel plates have been fabricated to enhance NTC property for cold-start solution and to modify the surface wettability by a dip-coating method via aqueous sol-gel process. Experimental analyses of thin films have been performed using diverse measuring equipment such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) to investigate the chemical composition, crystallinity, and microstructure. In order to confirm the effects of organic templating agent adding on the surface wettability, we found that the composite thin films fabricated with hexadecylamine as an organic templating agent showed hydrophobic characteristics (CA>90°). As a result, the nanostructure of the thin films and organic solvent remain despite high annealing temperature (573.15 ~ 673.15 K). Experimental result could provide applications for various fields such as fuel cell bipolar plates with cold-start capability and great water repellency by coating them to nanostructured hydrophobic vanadium oxide films.
URI
http://dcollection.hanyang.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000092575https://repository.hanyang.ac.kr/handle/20.500.11754/127030
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > MECHANICAL ENGINEERING(기계공학과) > Theses (Master)
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