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The diffusive transport through a porous electrode is studied here, based on scanning electron microscope (SEM) images of the porous layer, made by electrodeposition of Nickel oxide over nanostructured carbon film. Lattice Boltzmann model (LBM) is employed to simulate the concentration profile in the pore network considering bounceback at the solid nodes of scanning electron images (SEI). The direct use of a grayscale image with probabilistic bounceback as per the pixel-wise intensities is explored vis-à-vis the binarization of images by Otsu’s thresholding with total bounceback at the solid grids. The diffusion pathways are delineated, and the isolated voids are identified from the concentration changes across the pore network. The fraction of isolated voids, the overall diffusivity, and the average concentration in voids are studied for 300 SEIs. The distributions of these three parameters across the SEIs show the heterogeneity in the pore structure.

Delineation of diffusion pathways in nanostructured porous media by applying lattice Boltzmann modeling on scanning electron microscope images