Space charge storage in composites: thermodynamics

Chen, C.; Maier, J.

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Space charge storage in composites: thermodynamics

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Chen, C.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;
Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society;

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Maier, J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Chen, C., & Maier, J. (2017). Space charge storage in composites: thermodynamics. Physical Chemistry Chemical Physics, 19(9), 6379-6396.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D108-D

Abstract

Contacts of two phases, which allow for synergistic dissociative storage of a component in two space charge zones (`` job-sharing storage''), are considered from the viewpoint of point defect thermodynamics. The respective relations between charge and component activity (chemical potential of the component) are derived, or -for more complex cases -the recipes for their derivation are given. These relations describe -according to different experimental conditions -the connection between mass storage and outer partial pressure or between mass storage and the cell voltage in a coulometric titration cell. They also reflect theoretical charge/ discharge curves in battery cells when job-sharing storage predominates, and thus are also significant for supercapacitors. In addition to explicitly worked-out cases, it is pointed out how more general situations, such as simultaneous storage in bulk and in boundaries, specific adsorption or size effects, are to be treated.