A wearable All-Solid-State supercapacitor with extremely high stability based on 2D Co-HCF/GO

Herein, nanocomposites (denoted as Co-HCF/GO) with 2D GO sheets supporting cobalt hexacyanoferrate (Co-HCF) nanocubes are successfully synthesized via a hydrothermal method. Due to the cross-linking networks and synergistic effects between GO and Co-HCF in Co-HCF/GO, a high-performance supercapacitor with a specific capacity of 410.9 F g(-1) @ 1 A g(-1) and an ultrahigh cycling stability of 99.6% @ 10 A g(-1) is achieved. With CoHCF/GO as positive and negative electrodes, a symmetric flexible solid-state supercapacitor (FSSC) is assembled, which exhibits a high working voltage of 2.0 V, a high energy density of 45.8 Wh kg(-1) at a power density of 2.1 kW kg(-1) and an extremely high stability of 98.9% after 10,000 cycles when the charge-discharge cycle test is carried out under the condition of 10 A g(-1). Furthermore, the FSSC assembled by Co-HCF/GO exhibits exceptional flexibility and wearability, with superhigh capacitance stability even goes bent at various angles (0 & DEG;, 60 & DEG;, 120 & DEG; and 180 & DEG;). Light emitting diodes (LEDs) can be easily lit up by the FSSC for a period of approximately 6.8 min. This approach offers promising opportunities for the development of energy storage materials and devices with excellent flexibility, excellent stability, high energy and power density.

Automated summary

In this study, nanocomposites with high-performance supercapacitors and ultrahigh cycling stability are successfully synthesized. By assembling as a flexible solid-state supercapacitor, the device achieves high working voltage, high energy density, and extremely high stability. The supercapacitor also demonstrates exceptional flexibility and wearability, and can easily light up LEDs.