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

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).