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Keywords = spherical cobalt-based Prussian blue

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Article
Effect of Cobalt Content on the Microstructures and Electrochemical Performances of Cobalt-Based Prussian Blue Electrodes in a Sea Water Environment
by Chuanpei Sun, Huanyu Di, Rui Wang and Lianbo Wang
Coatings 2025, 15(12), 1405; https://doi.org/10.3390/coatings15121405 - 1 Dec 2025
Cited by 1 | Viewed by 661
Abstract
Cobalt-based Prussian blue hollow spheres (CoHCF HSs) with different Co contents were synthesized using a self-templated coprecipitation technology. The microstructure and electrochemical properties of CoHCF HSs were investigated. The results indicate that all samples exhibit a face-centered cubic crystal structure. With increasing cobalt [...] Read more.
Cobalt-based Prussian blue hollow spheres (CoHCF HSs) with different Co contents were synthesized using a self-templated coprecipitation technology. The microstructure and electrochemical properties of CoHCF HSs were investigated. The results indicate that all samples exhibit a face-centered cubic crystal structure. With increasing cobalt content in the Prussian blue analogues, the X-ray diffraction peaks shift toward higher angles due to the reduction in interplanar spacing. Computer simulations revealed that Na+ ions exhibit higher adsorption energies (ΔEa) at Co sites (ΔEa = 1.45 eV) compared to Fe sites (ΔEa = 1.18 eV), which enables Co sites to adsorb more Na+ ions, providing greater sodium storage capacity. With increasing cobalt content, the reduced aspect ratio of CoHCF HSs surface nanoscale protrusions decreases the specific surface area. Consequently, the overall average CoHCF HSs size decreases with increasing cobalt content, which predominates the increase in specific surface area, contributing to supplying more active sites. The best electrochemical properties showed an initial capacity of 121.16 mAh g−1 at a current density of 0.2 A g−1 but not at the largest specific surface area. These findings suggest that improving the electrochemical performance of CoHCF electrodes requires consideration of the synergistic effects between specific surface area and elemental composition. Full article
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