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Austenitic stainless steel with a niobium diffusion protective layer is evaluated as bipolar plate for the direct methanol fuel cell (DMFC).Corrosion resistance of niobium diffusion modified AISI 304 stainless steel (niobized 304 SS) are investigated in simulated DMFC anodic operating conditions of 0.5 M H2SO4 and 2 ppm HF with two different concentrations of methanol (1 M and 10 M) at 50 ℃.