Creation of hydrogen gas emitting function in proton conducting oxide ceramics by hydrogen implantation

Abstract

We have discovered the hydrogen gas emitting function from the eventual finding of anomalously rapid D–H replacement in SrCe 0.95Yb 0.05O 3− δ . The D–H replacement is modeled in terms of successive reactions: absorption of H + and adsorption of OH − due to dissociation of H 2O at the surface, diffusion of H + in the bulk and emission of DH gas due to recombination of H + with D implanted into traps and subsequent trapping of H + in the vacant traps. In the latter stage of the D–H replacement, emission of H 2 gas mainly takes place due to recombination of H + with H uptaken in the traps instead of HD gas. This emission of H 2 gas means the production of H 2 gas from water at room temperature. For the hydrogen gas emitting function of the hydrogen-implanted oxide ceramics, an atomistic reaction model is proposed. Moreover, the emission rate of H 2 gas at steady state is estimated from the experimental data on the D–H replacement using the mass balance equations for protons trapped and uptaken in the specimen and compared with the experimental data.