High performance hydrogel electrodes based on sodium alginate-g-poly (AM-c o-ECA-co-AMPS for supercapacitor application

Electrochemical conductive hydrogels are being extensively explored in the fabrication of portable batteries and high-performance supercapacitors. Herein, the rational design of a new polyanionic electrically conductive hydrogels based on sodium alginate-g-poly(AM-co-ECA-co-AMPS) are described. rGO was incorporated into the hydrogel during the polymerization process generating rGO@ sodium alginate-g-poly(AM-co-ECA-co-AMPS) composite hydrogels to study the impact of rGO on the performance of the hydrogels. FT-IR, XRD, and SEM-EDX characterized the chemical composition, crystalline, and morphological structure of the new synthesized hydrogels. The electrochemical performance of as-synthesized hydrogels was investigated by cyclic voltammetry, galvanostatic, charge-discharge rate, and electrochemical impedance spectroscopy. The supercapacitor perfor-mance for ECH2.5 composite hydrogel showed a capacitance of 753 F. g(-1) at 1 A. g(-1) with good rate capability and cycling stability up to 5000 cycles. Thus, ECH2.5 hydrogel is a good candidate as electrode material in supercapacitor applications.

Automated summary

This study describes the rational design of a new polyanionic electrically conductive hydrogel based on sodium alginate-g-poly(AM-co-ECA-co-AMPS) and investigates the impact of rGO on the performance of the hydrogels. The chemical composition, crystalline, and morphological structure of the synthesized hydrogels were characterized using various techniques, and their electrochemical performance was evaluated through different tests. The ECH2.5 composite hydrogel exhibited promising capacitance, rate capability, and cycling stability, making it a good candidate for electrode material in supercapacitor applications.