Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Electrochemical Characteristics of MMO(Ti/Ru)-Coated Titanium in a Cathode Environment of Polymer Electrolyte Membrane Fuel Cell

MMO(Ti/Ru) 코팅된 타이타늄의 고분자 전해질 연료전지 양극환경에서의 전기화학적 거동

  • Heo, Ho-Seong (Graduate school, Mokpo national maritime university) ;
  • Kim, Seong-Jong (Division of marine engineering, Mokpo national maritime university)
  • 허호성 (목포해양대학교 대학원) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2022.08.25
  • Accepted : 2022.09.08
  • Published : 2022.11.02
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Abstract

In this research, mixed metal oxide (TiO2, RuO2) coating was applied to grade 1 titanium as a bipolar plate for polymer electrolyte membrane fuel cell (PEMFC). Electrochemical experiments were carried out in an aqueous solution of pH 3 (H2SO4 + 0.1 ppm HF, 80 ℃) determined by DoE. The air was bubbled to simulate a cathode environment. Potentiodynamic polarization test revealed that corrosion current densities of the titanium substrate and MMO-coated specimen were 0.180 µA/cm2 and 4.381 µA/cm2, respectively. There was no active peak. After potentiostatic experiment, current densities of the titanium substrate and the MMO-coated specimen were 0.19 µA/cm2 and 1.05 µA/cm2, respectively. As a result of observing the surface before and after the potentiostatic experiment, cracked dried clay structures were observed without corrosion damage. Both the titanium substrate and the MMO-coated specimen could not satisfy the interfacial contact resistance suggested by the DoE. Thus, further research is needed before they could be applied as bipolar plates.

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References

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