Composite cathode with low-defect NiFe Prussian blue analogue on reduced graphene oxide for aqueous sodium-ion hybrid supercapacitors

Tianyu Miao; Jingyuan Zhang; Yang Wang; Kun Fang; Zhuo Wang; Ke Zhan; Bin Zhao

doi:10.1016/j.jcis.2023.06.035

Composite cathode with low-defect NiFe Prussian blue analogue on reduced graphene oxide for aqueous sodium-ion hybrid supercapacitors

J Colloid Interface Sci. 2023 Oct 15:648:768-777. doi: 10.1016/j.jcis.2023.06.035. Epub 2023 Jun 10.

Authors

Tianyu Miao¹, Jingyuan Zhang¹, Yang Wang¹, Kun Fang¹, Zhuo Wang¹, Ke Zhan¹, Bin Zhao¹

Affiliation

¹ School of Materials & Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China.

PMID: 37321096
DOI: 10.1016/j.jcis.2023.06.035

Abstract

Although sodium-ion hybrid supercapacitor (Na-ion HSC) has attracted great interest, exploitation of suitable cathode materials for reversible Na⁺ insertion reaction remains a challenge. Herein, a novel binder-free composite cathode with highly crystallized NiFe Prussian blue analogue (NiFePBA) nanocubes in-situ grown on reduced graphene oxide (rGO) was fabricated via sodium pyrophosphate (Na₄P₂O₇)-assisted co-precipitation and the subsequent ultrasonic spraying and chemical reduction. Profiting from the low-defect PBA framework and close interface contact of PBA and conductive rGO, the NiFePBA/rGO/carbon cloth composite electrode exhibits a high specific capacitance of 451F g^-1, remarkable rate performance and satisfactory cycling stability in aqueous Na₂SO₄ electrolyte. Impressively, the aqueous Na-ion HSC assembled with the composite cathode and activated carbon (AC) anode manifests a high energy density of 51.11 Wh kg^-1, superb power density of 10 kW kg^-1 and the intriguing cycling stability. This work may open a door for scalable fabrication of binder-free PBA cathode material for aqueous Na-ion storage.

Keywords: Composite cathode; Na-ion HSC; NiFePBA; rGO.