Publication date: 10th April 2024
Protonic ceramics has attracted much attention as the potential material for electrochemical devices that reduce an environmental impact. Physical properties of these materials are restricted by the formation defect derived dopant and the conductivity is in proportion to the product of the proton concentration and diffusivity. Proton concentration depends on the amount of the oxide ion vacancy, which is formed due to charge compensation with acceptor dopants. Proton diffusivity depends on crystal structure and dopant arrangement. To achieve both a high proton concentration and fast proton diffusivity, we demonstrate fast proton conduction in nonstoichiometric barium zirconate, which could form a large number of defects without adding dopant. Nonstoichiometry of cation and oxide ion possibly incorporate proton into crystal and proton migration might be not limited by trap between proton and dopant. We tried to form the nonstoichiometric defect and enhance proton conduction by the exsolution technique used to disperse catalyst. To introduce a nonstoichiometric defect, lutetium- and nickel-codoped barium zirconate was reduced under hydrogen atmosphere and, then, nickel was exsolved. The exsolved sample shows the proton conduction, which exceeds 0.01Scm-1 in the temperature range of 400-800 ℃. We attempted to generate electricity in a fuel cell using this material as an anodic catalyst. The catalyst showed superior power generation properties for fuel cells at 500-650°C.
This work was partially supported by the New Energy and Industrial Technology Development Organization (NEDO)
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