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STIR: Improved Electrolyte Surface Exchange via Atomically Strained Surfaces

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Technical Report,10 Jun 2014,09 Jan 2015

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University of Delaware Newark United States

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Solid electrolytes are highly and increasingly important energy technology components, but high operating temperatures tend to limit their utility. Such temperatures are required, in large part, so that the kinetics of the ion exchange reactions at the surfaces are sufficiently fast. A highly promising means to improve low temperature surface exchange is via mechanical strain. Such effects have been demonstrated in bulk ion diffusion but not, to date, in surface exchange. In this work, we have created model systems to systematically measure the ability to engineer strain-based increases in oxygen exchange kinetics of ceramic surfaces using a thin film deposition technique developed at the University of Delaware. Concomitant with the experimental work, we also conducted numerical simulations of the experiments. A Poisson-Nernst-Planck system modified to include reaction terms was built in COMSOL Multiphysics to describe the mass and charge fluxes related to electrons and both neutral and charged oxygen species within the electrode and electrolyte and along all interfaces.

Subject Categories:

  • Physical Chemistry
  • Electrical and Electronic Equipment

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