Abstract
An electron-conducting mixed oxide, Co-Pt bronze was synthesized and examined as a candidate for a highly durable electrocatalyst for both the polymer electrolyte fuel cells and electrolyzers. The motivation of this study comes from the fact that this material has not been studied as an electrocatalyst in acidic media, although past studies showed a high electronic conductivity and a high corrosion resistance. Co-Pt bronze without metallic Pt was obtained by solid-state synthesis and hot aqua regia rinsing. The OER activity was found to be among the highest as a material without Ir and Ru in acidic media, and it showed extremely high electrochemical stability in the OER potential range. Its oxygen reduction reaction (ORR) was obtained after potential cycles down to the hydrogen region, which formed a thin Pt metallic layer over the oxide. While its specific activity was not more than that of pure platinum nanoparticles, its durability against the potential cycles was much higher.
Highlights
Electrocatalysts facilitating electrochemical reactions are one of the most important components for realizing the hydrogen economy
While platinum is highly active in hydrogen oxidation reactions (HORs), its activity toward oxygen reduction reactions (ORR) is not sufficiently high for wider commercialization; various attempts have been made to enhance activity by alloying [1], forming core-shell structures [2]
ORR, oxygen evolution reaction (OER), HOR and activity, and durability tests to clarify this type this of material a potential a practical in acidic media is worth whether type ofhas material has aaspotential aselectrocatalyst a practical electrocatalyst in and acidic media further and is study
Summary
Electrocatalysts facilitating electrochemical reactions are one of the most important components for realizing the hydrogen economy. To alleviate this mode of degradation, a high oxygen evolution reaction (OER) activity should be provided to the “cathode” Another degradation mode is called the reverse potential mode [7], in which if insufficient H2 gas, compared to applied current, is supplied to some cells in a series connected stack, the potential is reversed to cause carbon oxidation in the anode. ORR, OER, HOR and activity, and durability tests to clarify this type this of material a potential a practical in acidic media is worth whether type ofhas material has aaspotential aselectrocatalyst a practical electrocatalyst in and acidic media further and is study. Pt are in their oxidized states, is totally different worth further study.
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