title: Electrodeposited Na2VOx[Fe(CN)6] films As a Cathode Material for Aqueous Na-Ion Batteries.
abstract: 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 Na2VOx[Fe(CN)6] 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 (ΔE1/2≈ 0.91 V vs Ag/AgCl reference electrode) in acidic media with a specific capacity of ∼80 mAh g-1recorded at high C-rates (30 C) in 1 M LiNO3, 3 M NaNO3and 3 M KNO3electrolytes in the presence of 3.6 M H2SO4. 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.
authors.affiliation: Physik-Department ECS, Technische Universität München , James-Franck-Straße 1, 85748 Garching, Germany.
authors.forename: Bianca
authors.initials: B
authors.lastname: Paulitsch
authors.affiliation: Physik-Department ECS, Technische Universität München , James-Franck-Straße 1, 85748 Garching, Germany.|Nanosystems Initiative Munich (NIM) , Schellingstraße 4, 80799 Munich, Germany.
authors.forename: Jeongsik
authors.initials: J
authors.lastname: Yun
authors.affiliation: Physik-Department ECS, Technische Universität München , James-Franck-Straße 1, 85748 Garching, Germany.|Nanosystems Initiative Munich (NIM) , Schellingstraße 4, 80799 Munich, Germany.
authors.forename: Aliaksandr S
authors.identifier: http://orcid.org/0000-0002-5970-4315
authors.initials: AS
authors.lastname: Bandarenka
keywords: Na-ion battery; Prussian blue analogues; cathode battery materials; intercalation; vanadium hexacyanoferrate