The typically reported diffusion coefficients for both modifications range from 10 -9 to 10 -12 cm 2 s -1 . 149 There are a few reports that state drastically lower diffusion coefficients of 10 -13 cm 2 s -1 and below. Komayko et al. showed that for nanosized materials one does not need the assumption of a fast ionic / electronic transport in the bulk lattice, as even low apparent diffusion coefficients translate into impressive rate capabilities. They argue that Prussian blue powders easily disperse when in contact with electrolyte and that the agglomerates are highly permeable for the electrolyte. Consequently, shortest way of diffusion during (de-)intercalation is through the primary particles instead of diffusion though interparticle grain boundaries within the agglomerate. They suggest that one should use the size of the primary particle instead of the agglomerate size for the calculation of diffusivities, which would lower the apparent diffusion coefficients by 3-5 orders of magnitude. An overview over many experimental results can be found in the account of Furthermore, the diffusivities of some Prussian blue analogue structures might be limited by their effective electronic conductivity within the agglomerates, instead of slow solid state diffusion rates. 151