연구 Highlight
[초청강연]“Prussian blue analogues for diverse rules in batteries”
Prussian Blue and its analogues (PBAs) have garnered attention due to their unique properties that arise from the continuous chemical bonds between transition metal ions and ligand molecules. These compounds, due to the presence of cyanide (CN) ligands, enable long-range charge transport, which contributes free electrons for electrical conduction. Due to such flexibility in their design and resultant properties, they can have a wide variety of applications including energy storage, harvesting, catalysis, and magnetic applications. In this talk, I will introduce the multiple uses of PBAs, including their role in electrodes for energy storage, thermo-charging systems, surface coatings, and redox mediator materials. As an example, I will introduce a Cr-based negolyte that is coordinated with strong-field ligands. The complex of [Cr(CN)6]4− prefers low-spin states, facilitating a stable and fast redox reaction, capable of mitigating strong Jahn–Teller effects, thereby facilitating low redox potential, high stability, and rapid kinetics. This complex has the potential to be utilized in aqueous redox-flow batteries, exhibiting a high-energy density of 11.4 Wh L−1 and a long-lasting lifetime of thousands of cycles. Furthermore, the compound of manganese hexacyanometallates (MnHCMn) exhibits a monoclinic crystal structure composed of nonlinear Mn–N≡C–Mn bonds and containing eight large interstitial sites occupied by Na+ ions. The experiments demonstrate a high specific capacity exceeding 200 mAh g-1 and a novel mechanism wherein small lattice distortions allow for the unprecedented storage of 50% more sodium cations than in the undistorted case. Overall, I will present a comprehensive overview of applications for PBAs in the context of various battery technologies.
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