期刊
ELECTROCHIMICA ACTA
卷 354, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136534
关键词
Impedance spectroscopy; Electrode microstructure; Smoothed boundary method; Three-dimensional simulations; Tortuosity
资金
- United States National Science Foundation, Division of Material Research, Ceramics Program [DMR-1912530, DMR-1912151, DMR-1506055]
- United States National Science Foundation [ACI-1053575]
- National Energy Research Scientific Computing Center (NERSC), a DOE Office of Science User Facility
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- University of Michigan Advanced Research Computing
Electrochemical impedance spectroscopy (EIS) has been widely employed to probe material properties in energy materials. One important aspect of EIS is the diffusional impedance. To date, the diffusional impedance behavior is understood based on the analytical solutions of the one-dimensional (1D) diffusion equation. However, transport in materials is strongly influenced by the materials' three-dimensional (3D) microstructures that often possess complex geometries that are unlike the simplified ID domains. In this work, we simulate the concentration response driven by oscillating loads by solving the diffusion equation in complex, experimentally determined 3D microstructures obtained from solid oxide fuel cell cathode and lithium-ion battery cathode. The simulation results demonstrate that the diffusional impedance can serve as a new technique for the evaluation of microstructural characteristics of porous media, including the tortuosity, the porosity, and the area of the loading boundary. Our findings open a new array of applications for diffusional impedance measurements. (C) 2020 Elsevier Ltd. All rights reserved.
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