Physik-Department ECS, Technische Universität München , James-Franck-Straße 1, 85748 Garching, Germany.
Nanosystems Initiative Munich (NIM) , Schellingstraße 4, 80799 Munich, Germany.
ACS Appl Mater Interfaces. 2017 Mar 8;9(9):8107-8112. doi: 10.1021/acsami.6b15666. Epub 2017 Feb 27.
The so-called Prussian blue analogues (PBAs) are spotlighted as promising cathode materials for aqueous Na-ion batteries regarding their good performance for the application in future large-scale energy storage systems. In this work, we demonstrate that one of the PBA representatives, namely NaVO[Fe(CN)] thin films (VHCFs), is a promising cathode material for aqueous Na-ion batteries with very positive intercalation/deintercalation potentials, which might likely designate a new benchmark in the field. To maximize the material utilization, we have formed VHCF thin films on model current collectors from aqueous solutions. The resulting films demonstrated a very positive half-charge potential (ΔE ≈ 0.91 V vs Ag/AgCl reference electrode) in acidic media with a specific capacity of ∼80 mAh g recorded at high C-rates (30 C) in 1 M LiNO, 3 M NaNO and 3 M KNO electrolytes in the presence of 3.6 M HSO. It is also shown that well-known solvation effects related to the nature of the alkali metal cations during intercalation and deintercalation are surprisingly not pronounced in the case of VHCFs.
所谓普鲁士蓝类似物（PBAs）因其在未来大规模储能系统中的应用具有良好的性能而被视为水钠电池有前途的阴极材料。在这项工作中，我们证明了 PBA 代表之一，即 NaVO[Fe(CN)] 薄膜（VHCFs），是一种很有前途的水钠电池阴极材料，具有非常正的嵌入/脱嵌电位，这可能在该领域设定一个新的基准。为了最大限度地提高材料的利用率，我们已经从水溶液中在模型集电器上形成 VHCF 薄膜。在酸性介质中，所得薄膜在 30 C 的高 C 率下在 1 M LiNO、3 M NaNO 和 3 M KNO 电解质中具有非常正的半充电位（ΔE≈0.91 V 相对于 Ag/AgCl 参比电极），并且记录了约 80 mAh g 的比容量。还表明，在 VHCFs 的情况下，与嵌入和脱嵌过程中碱金属阳离子性质相关的众所周知的溶剂化效应出乎意料地不明显。
