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

허호성; 김성종

doi:10.14773/cst.2022.21.5.340

MMO(Ti/Ru) 코팅된 타이타늄의 고분자 전해질 연료전지 양극환경에서의 전기화학적 거동
Electrochemical Characteristics of MMO(Ti/Ru)-Coated Titanium in a Cathode Environment of Polymer Electrolyte Membrane Fuel Cell 원문보기

Corrosion science and technology, v.21 no.5, 2022년, pp.340 - 347

허호성 (목포해양대학교 대학원) , 김성종 (목포해양대학교 기관시스템공학부)

Abstract ▼ AI-Helper

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.

주제어

표/그림 (10)

그림 Fig. 1. Schematic diagram for measuring interfacial contact resistance; (a) R₁, (b) R₂
표 Table 1. Chemical compositions of grade 1 titanium (wt%)
그림 Fig. 2. Cross-sectional images of MMO coated specimen and EDS analysis
그림 Fig. 3. XRD patterns of titanium substrate and MMO coated specimen; (a) Ti substrate, (b) MMO coated specimen
그림 Fig. 4. Potentiodynamic polarization curves of titanium substrate and MMO coated specimen in the simulated PEMFC cathode environment
그림 Fig. 5. I-t curves after potentiostatic experiment of titanium substrate and MMO coated specimen in the simulated PEMFC cathode environment
그림 Fig. 6. Surface microstructures of MMO coated specimen before and after potentiostatic experiment in the simulated PEMFC cathode environment
그림 Fig. 7. Nyquist plot and equivalnt and equivalnet circuit of titanium substrate and MMO coated specimen in the simulated PEMFC cathode environment; (a) Nyquist plot, (b) Equivalent circuit
표 Table 2. Fitting parameters of titanium substrate and MMO coated specimen from Fig. 7a Nyquist plot
그림 Fig. 8. Interfacial contact resistance of titanium substrate and MMO coated specimen with different compaction force

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