Fast energy storage performance of CoFe2O4/CNTs hybrid aerogels for potassium ion battery

We report CoFe2O4 and carbon nanotubes hybrid aerogels as a novel anode material for potassium ion batteries (KIBs). The synthetic route take the advantage of marine biobased materials as the precursor and facilely produce large-scale production of hybrid CoFe2O4 and carbon nanotubes aerogels as the advanced anode. The hybrid aerogels deliver a remarkable capacity of 180 mAh g(-1) with high stability over 200 cycles at a current density of 0.1 A g(-1). The high rate charge/discharge reveals a relatively high capacity of 83 mAh g(-1) even at the current density of 1.0 A g(-1). In-situ XRD investigations reveal the phase evolution during charge/discharge, demonstrating the high stability of hybrid aerogels for the potassium intercalation/extraction. The high specific surface area and large numbers of mesopores with more active sites can benefit the effective transmission of electrons and K ions, leading to an improved specific capacity and cycle stability. (C) 2021 Elsevier Inc. All rights reserved.

Automated summary

Novel hybrid aerogels of CoFe2O4 and carbon nanotubes were synthesized using marine biobased materials, delivering remarkable capacity and cycling stability as an advanced anode material for potassium ion batteries. The high specific surface area and large numbers of mesopores with more active sites benefit effective electron and K ion transmission, leading to improved specific capacity and cycle stability.