Resolving the Seeming Contradiction between the Superior Rate Capability of Prussian Blue Analogues and the Extremely Slow Ionic Diffusion

• DOI: 10.1021/acs.jpclett.2c00482
• Publication Date: 2022-04-04T12:00:22Z
• Authors: Alena I. Komayko; Natalya A. Arkharova; Denis E. Presnov; Eduard E. Levin; Victoria A. Nikitina
• Keywords: Prussian blue

The superior rate capabilities of metal ion battery materials based on Prussian blue analogues (PBAs) are almost exclusively ascribed to the extremely fast solid-state ionic diffusion, which is possible due structural voids and spacious three-dimensional channels in PBA structures. We performed a detailed electroanalytical study alkali diffusivities nanosized cation-rich cation-poor PBAs obtained as particles or electrodeposited films both aqueous non-aqueous media, resulted solid conclusion about exceptionally slow transport. show that impressive capability determined solely by small size primary PBAs, while apparent diffusion coefficients 3-5 orders magnitude lower than those reported earlier studies. Our finding calls for reconsideration facility transport deeper analysis charge carrier-host interactions PBAs.