Prussian Blue Analogue‐Derived ZnO/ZnFe₂O₄ Core‐Shell Nanospheres as High‐Performance Anodes for Lithium‐Ion and Potassium‐Ion Batteries

Abstract

Herein, core-shell nanostructured ZnO/derived from self-sacrifice template method with Prussian blue analogue (i. e., Zn 3 [Fe-(CN) 6 ] 2 ) as precursor has been successfully synthesized by controlling the calcination temperatures and heating rates. The formation mechanism of core-shell nanostructures has been explored through the morphology transformation under different synthetic conditions. Impressively, ZnO/ZnFe 2 O 4 hybrid material with core-double shell nanostructure shows good cycling performance as anodes of lithium-ion batteries (1137 mAh g À 1 at 1 A g À 1 after 80 cycles) and potassium-ion batteries (217 mAh g À 1 at 0.1 A g À 1 after 400 cycles). The excellent performances can be attributed to the unique coredouble shell nanostructure as well as synergistic effects of ZnO and ZnFe 2 O 4 . The results indicate that the strategy of designing nanostructures could successfully improve the electrochemical performances of ZnO/ZnFe 2 O 4 and effectively expand the commercial application of transition metal oxides.

Recent advances in rational design for high-performance potassium-ion batteries

“…346,551 To overcome these shortcomings, commonly used tools include nanofabrication, carbon coating, and surface engineering. 336,[389][390][391][392][552][553][554] In 2019, Fang et al 390 converted 2D Ti 2 C MXene nanosheets into TiO 2 nanoparticles and composited them with rGO to create negative electrodes for PIBs. Due to enhanced electrical conductivity and capacitance capacity, the TiO 2 /rGO composite exhibits large capacity and excellent rate capability.…”

Flexible g‐C3N4 Enhancing Superior Cycling Stability of ZnFe2O4‐Fe2O3 Nanosheet Composites as High‐Capacity Anode Materials for Lithium‐Ion Batteries

“…The authors have cited additional references within the Supporting Information. [20,33,[51][52][53][54][55][56][57][58][59][60][61][62]…”

Synthesis and Characterization of Zinc/Iron Composite Oxide Heterojunction Porous Anode Materials for High-Performance Lithium-Ion Batteries

“…In addition, synthesis can also be based on Prussian Blue Analogue (PBA). For example, Xing et al directly prepared high-performance anode materials with ZnO/ZnFe 2 O 4 core-shell structures using PBA derivatives [32]; Yuan et al synthesized high-performance ZnO/ZnFe 2 O 4 @C by adding dopamine on the basis of oxides formed by PBA materials and anode material [33]. Marcella Bini et al reviewed ZnFe 2 O 4 as a high-performance anode material for lithium-ion batteries [34].…”