Hydrogen first, oxygen next: The kinetics of water incorporation in situ has been followed by spatially resolved local optical absorption spectroscopy as well as by integral conductance by using SrTiO3 as a model oxide proton conductor. The surprising nonmonotonic redox kinetics can be explained by a decoupling of the H2O diffusion into a fast diffusion of hydrogen and a more sluggish diffusion of oxygen (see picture).
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Yu et al. (2007) studied this question.
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