Platinum group metal-free catalysts for polymer electrolyte fuel cells are analyzed in different electrolytes (H2SO4 and HClO4) and at different pH's to gain insight into the oxygen reduction reaction (ORR) mechanism. Two Fe-N-C type catalysts each show a reversible voltammetric redox couple around 0.77 V vs. RHE in HClO4 electrolyte. A notable cathodic shift of the redox couple to 0.62 V is observed in H2SO4 and is assigned to bisulfate adsorption. Concurrently, the ORR activity of the catalysts is unaffected, suggesting an independent nature of the reductive mechanism with the redox peak species.
INCONEL@ alloy 625 is a nickel-chromium-molybdenum alloy that is used for its high strength, excellent fabricability and weldability, and outstanding corrosion resistance. The outstanding and versatile corrosion resistance of INCONEL alloy 625 under a wide range of temperatures and corrosive environments is the primary reason for its wide acceptance in chemical processing and other applications. This paper will present laboratory and field data related to the resistance of alloy 625 to various aqueous media causing localized corrosion, stress corrosion cracking and other forms of attack. Also the versatility of the alloy for use in oxidizing, carburizing, chlorinated solvents and simulated waste incinerator type environments containing halide species, will be demonstrated.@INCONEL is a trade mark of the Into family of companies.
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