One-Step Coprecipitation Synthesis of Titanium Hexacyanoferrate Nanosheet-Assembled Hierarchical Nanoflowers for Aqueous Zinc-Ion Batteries

Abstract

Constructing three-dimensional hierarchical nanostructures has been considered one of the most effective strategies to improve electrode material performance for electrochemical energy storage. Herein, titanium hexacyanoferrate hierarchical nanoflowers (TiHCF HNFs) assembled by TiHCF nanosheets have been synthesized through a facile one-step coprecipitation approach. As a cathode material of aqueous zincion batteries (AZIBs), TiHCF HNFs exhibit an operating voltage of 1.72 V and a reversible capacity of 67.8 mAh g −1 . Impressively, TiHCF HNFs deliver a specific capacity of 47.0 mAh g −1 after 500 cycles with a retention rate of 70.6% under 200 mA g −1 . This work may inspire the synthesis of Prussian blue analogue nanosheets and provide an understanding on the evolution of the TiHCF cathode for AZIBs.

Vanadium Oxide Cathode Coinserted by Ni2+ and NH4+ for High-Performance Aqueous Zinc-Ion Batteries

“…To date, the most studied cathode materials include manganese-based compounds, − Prussian blue and its analogs, − as well as some organic compounds. , However, the development of these materials has been hindered by various challenges. For instance, manganese-based compounds suffer from the irreversible phase transition and/or dissolution issue; Prussian blue has a limited capacity and the related organic compounds face the problem of dissolution of discharge products. − In the meantime, vanadium-based materials, such as vanadium oxides and vanadates have recently gained intensive attention due to their high theoretical capacities and low cost . Thereinto, hydrated vanadium pentoxide (V 2 O 5 ·nH 2 O) stands out as it has more active sites and tolerance to the insertion/extraction of Zn 2+ owing to the unique layered structure with a relatively large interlayer spacing .…”