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Electrodeposition of Binder-Free Peptide/Co(OH)2 Nanohybrid Electrodes for Solid-State Symmetric Supercapacitors

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journal contribution
posted on 13.09.2021, 14:42 authored by Devraj Singh, Rohit G. Jadhav, Apurba K. Das
Organic–inorganic nanohybrids with diverse nanoarchitectures and intrinsic electronic properties are considered as efficient active materials for electrochemical charge storage applications. Herein, we have successfully electrodeposited peptide-based nanohybrids on carbon fiber paper (CP) substrates as the electrodes for the fabrication of symmetric supercapacitors (SCs). The electrodeposition technique has been used for in situ fabrication of a benzo­[2,1,3]­selenadiazole-5-carbonyl-protected BSeYY (BSe = benzo­[2,1,3]­selenadiazole; Y = tyrosine) dipeptide cross-linked with cobalt hydroxide (BSeYY/Co­(OH)2) on CP without any additives such as binder and conductive materials. The synthesized nanohybrid BSeYY/Co­(OH)2 has been well characterized. The electrochemical characterization of the nanohybrid electrode has been performed in alkaline electrolytes (1 M KOH and 1 M LiOH). The BSeYY/Co­(OH)2 nanohybrid shows paramount electrochemical performance in 1 M KOH compared to 1 M LiOH. The electrochemical measurements exhibit an outstanding capacitance of 974.78 F g–1 at 1 A g–1 current density and a capacitance retention of 78.62% after 3000 cycles at 18 A g–1 in 1 M KOH electrolyte. The assembled symmetric SC device exhibits a maximum energy density of 16.35 W h kg–1 at 0.5 A g–1 and the highest power density of 617.37 W kg–1 at 2 A g–1. The symmetric device represents excellent capacitance retention of 81.04% at 2 A g–1 after 5000 cycles. The symmetric energy-storage device has been utilized to light up a red light-emitting diode. The efficient charge storage performance of the nanohybrid could be attributed to the cross-linked nanosheet structure with charge-storage sites and fast charge-transport channels.