Fuel Cell Polar Plate Catalytic Coating Against Voltage Inversion

The patent converts the harmful effect of voltage inversion (which causes corrosion) into a beneficial protective mechanism. When voltage inversion occurs, the catalytic material layer actively catalyzes the decomposition of peroxide into water and oxygen, transforming the harmful high-potential state into a protective reaction that prevents corrosion of the substrate and extends fuel cell durability.

The catalytic material layer serves as an intermediary between the substrate and the harmful high-potential environment. This intermediate layer withered than 1nm thickness provides a protective barrier that prevents direct contact between the corrosive inverted voltage and the substrate, while the catalytic materials (such as Pt, Pd, Ir, or their oxides) mediate the chemical reaction to decompose peroxide and eliminate the harmful effects.

The patent employs an extremely thin catalytic material layer (withered than 1nm) deposited on the substrate surface. This thin film approach provides the necessary corrosion protection and catalytic functionality without significantly increasing the overall device complexity or thickness. The thin film can be applied using standard deposition techniques, maintaining manufacturing simplicity while achieving the protective function.

The polar plate becomes a composite structure combining the substrate material (metal or carbon) with a catalytic material layer (Pt, Pd, Ir, or their oxides). This composite approach leverages the strengths of each material: the substrate provides structural integrity and electrical conductivity, while the thin catalytic layer provides corrosion resistance and catalytic activity. The composite structure can be manufactured using existing coating and deposition technologies, minimizing the increase in device complexity.