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

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 zinc-ion 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.