Electrodeposited Stable Binder‐Free Organic Ni(OH)₂ Flexible Nanohybrid Electrodes for High‐Performance Supercapacitors

Abstract

Organic–inorganic hybrid materials with nanoscale morphologies gain significant attention as a potential candidate for energy storage applications. Herein, nickel hydroxide (Ni(OH)2) and benzo[2,1,3]selenadiazole (BSe)‐capped dipeptide amphiphiles are electrodeposited over flexible nickel foam (NF) substrates to fabricate organic–inorganic nanohybrids. The in situ electrochemical deposition of organic–inorganic nanohybrids is investigated by Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy, energy dispersive‐electron microscopy, and elemental mapping. The nanostructured morphology of the nanohybrid material is investigated by field‐emission scanning electron microscopy and transmission electron microscopy. The electrochemical performance and supercapacitor properties are examined in 1 m KOH aqueous solution. Aromatic diphenylalanine (FF)‐based nanohybrid BSeFF/Ni(OH)2 deposited on the NF electrode exhibit a specific capacitance of 1250 F g−1, whereas dileucine (LL)‐based nanohybrids BSeLL/Ni(OH)2 show a specific capacitance of 689 F g−1 at a current density of 2 A g−1.

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

“…For the exploration and advancement of these types of nanohybrid materials, we have synthesized benzo­[2,1,3]­selenadiazole (BSe)-protected dityrosine peptide (BSeYY) by a simple liquid-phase synthesis method. BSeYY and cobalt nitrate hexahydrate [Co­(NO 3 ) 2 ·6H 2 O] have been used for the fabrication of BSeYY/Co­(OH) 2 /CP-based nanohybrids using a one-step electrodeposition method. ,− The electrochemical performances of the hybrid electrode have been analyzed in alkaline electrolytes, and efficient charge storage performance has been observed in 1 M KOH compared to 1 M LiOH electrolyte solution. For the practical application, a symmetric SC device has been assembled by using two BSeYY/Co­(OH) 2 /CP nanohybrid electrodes.…”