그래핀이 코팅된 스테인리스강의 고분자전해질 연료전지 분리판 적용을 위한 표면 특성

• Published in: Biuletyn Uniejowski Vol. 44; no. 5; pp. 226 - 231
• Main Authors: 이수형(Su-Hyung Lee), 김정수(Jungsoo Kim), 강남현(Namhyun Kang), 조형호(Hyung-Ho Jo), 남대근(Dae-Guen Nam)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2011
• Subjects: 기계공학; PEMFC; Bipolar plate; Graphene; Stainless steel; Electro spray coating
• ISSN: 1225-8024; 2299-8403; 2288-8403

Graphene was coated on STS 316L by electro spray coating method to improve its properties of corrosion resistance and contact resistance. Exfoliated graphite (graphene) was made of the graphite by chemical treatment. Graphene is distributed using dispersing agent, and STS 316L was coated with diffuse graphene solution by electro spray coating method. The structure of the exfoliated graphite was analyzed using XRD and the coating layer of surface was analyzed by using SEM. Analysis showed that multi-layered graphite structure was destroyed and it was transformed into fine layers graphene structure. And the result of SEM analysis on the surface and the cross section, graphene layer was uniformly formed with 3~5 ${\mu}m$ thickness on the surface of substrate. Corrosion resistance test was applied in the corrosive solution which is similar to the PEM fuel cell stack inside. And interfacial contact resistance test was measured to simulate the internal operating conditions of PEM fuel cell stack. The results of measurements show that stainless steel coated with graphene was improved in corrosion resistance and surface contact resistance than stainless steel without graphene coating layer.