GO based nanocomposite hydrogel enabled high performance wearable all-solid supercapacitor based on hierarchical structure electrodes derived from ZIF-67

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2024-05, Vol.961, p.118236, Article 118236
• Main Authors: Liu, Dongxu, Wang, Junhao, Wang, Mengyan, Sultana, Rabia, Cui, Lili, Zhang, Xin, Han, Yinghui
• Format: Article
• Language: English
• Subjects: All solid-state supercapacitor; Hierarchical structure; Hydrogel electrolyte; NiCo2O4; ZIF-67
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2024.118236

Hierarchically structured nanocomposites derived from ZIF-67 as electrodes Configured with GO-based hydrogel as electrolytes for all-solid flexible and wearable supercapacitors were prepared. The supercapacitor exhibited a high specific capacitance with high conductivity, ultrahigh stretchability, and powerful adhesiveness. [Display omitted] •The all solid flexible and wearable supercapacitor was prepared.•Co3O4 derived from ZIF-67 growth on NiCo2O4 nanowires were prepared as electrode.•Graphene oxide based hydrogel were prepared as the solid electrolyte.•The supercapacitor exhibited a high specific capacitance. The flexible and wearable supercapacitors have attracted wide interest because of their widespread application in smart electronic devices with rapid charging and discharging. As an important part of supercapacitor, the electrode materials with a hollow structure, especially those with hierarchical structures that provide an array of continuous hollow cages, are considered promising. Because of its porous shell which is rich in redox reaction sites for supercapacitors. In this work, we fabricated a ZIF-67 derived hollow Co3O4 growth on the surface of 1D NiCo2O4 to assemble into a beaded structure. In this case, NiCo precursor acted as a structure-directing agent to grow a ZIF-67, a promising electroactive material of electrochemical capacitors to provide capacitance after calcination. Combined with the grapheneoxide (GO) based high conductivity hydrogel as the solid electrolyte, the capacitance of the flexible supercapacitor exhibited a high specific capacitance of 90F g−1 at 0.5 A/g, and it was sturdy and durable. There was no significant loss of capacitance while suffering from bending and pressing. The outstanding electrochemical properties of the all-solid supercapacitor can be attributed to the unique nanostructure of the electrode that created more reactive active sites, increased the diffusion pathway for electrolyte ions, along with the high conductivity of the hydrogel electrolyte.