Abstract
Prussian blue analogues are considered as a class of extremely promising electrode materials for various energy storage devices. Here, the potassium cobalt hexacyanoferrate (K2CoFe(CN)6) with a nanocubic assembled structure was successfully synthesized via a one-step hydrothermal method and low-temperature calcination operation; this material is employed as the working electrode for aqueous aluminum ion batteries (AIBs). To some extent, such a 3D open-framework structure accelerated the electronic and ionic transmission and optimized the electrochemical properties. The as-prepared K2CoFe(CN)6 demonstrated a reversible discharge capacity of 50 mA h g−1 at a of 0.1 A/g and showed a desirable cycling stability, which makes it a feasible electrode material for aqueous AIBs.
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