Synergistic Assembly of Peptide-Metal Hydroxide Hybrid Nanostructures for Electrochemical Capacitors

Abstract

Electrochemical deposition of metal hydroxide in presence of peptide amphiphile results self-assembled nanoscale hybrid thin films. We demonstrate here the self-assembly of three small aromatic peptides (NmYW, NmFW and NmFY) with three transition metal hydroxides (Co(OH) 2 , Ni(OH) 2 and Zn(OH) 2 ). Here peptides are used as structure directing agent for the construction of organic/inorganic hybrid nanostructured materials. Electrodeposition of different peptide/metal hydroxides is carried out potentoiodynamically applying constant potential using indium tin oxide (ITO) as working electrode. Scanning electron microscopy (SEM) is used to visualize the surface morphology of peptide/metal hydroxide thin films. The interactions among peptides and peptides-metal hydroxides are exhibited using Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) studies. Electrochemical measurements are performed to examine the energy storage behavior of peptide/metal hydroxide nanohybrids. Porous nanostructure of peptide/Co(OH) 2 hybrid shows high capacitance of 3070 Fg -1 through electron transfer mechanism in the potential range -0.2 to 0.6 V at discharge current of 5 mA. Soft and porous nanostructure facilitates the electrochemical accessibility of electrolyte OHions to Co(OH) 2 thin films and fast diffusion rate within the redox phase. This study provides a useful platform for the construction of various electrochemically active peptide/metal hydroxide nanoscale hybrid materials which exhibit capacitive electrochemical performance in energy storage applications.[a] Prof.

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

“…A vibration mode assigned at ≈672 cm −1 is observed due to to δ‐Ni—O—H stretching deformation (Figure ), respectively . Remarkably, the carboxyl groups stretching band in between 3000–3100 cm −1 (—OH stretching vibration) and 1700–1720 cm −1 (C═O stretching frequencies) disappeared due to metal–carboxylate interactions between metal ions and carboxylate group of peptide moiety (Figure ), respectively …”

“…The layer formed over the flexible NF substrate indicates the deposition of peptide/Ni(OH) 2 ‐based nanohybrid material. The electrochemical conversion of the dipeptide and Ni(NO 3 ) 2 to peptide/Ni(OH) 2 can be expressed as follows …”

Electrodeposited Organic–Inorganic Nanohybrid as Robust Bifunctional Electrocatalyst for Water Splitting

“…Furthermore, the scanning transmission electron microscopy (STEM) with elemental analysis (Figure g–k) displays the uniform distribution of Ni, O, Se, and N over the cross-linked nanosheets of the BSeF/Ni­(OH) 2 nanohybrid. The synthesis and deposition of the BSeF/Ni­(OH) 2 nanohybrids can be explained by a nucleation growth mechanism. , The Ni 2+ ions present in 1:1 DMSO/deionized water solution interact with hydroxide ions accumulated on the CP for the deposition of Ni­(OH) 2 on the CP surface. Simultaneously, the deprotonation of carboxylic acid groups of organic BSeF occurs by hydroxide ions.…”

Peptide‐Based Assemblies for Supercapacitor Applications

“…[120] Electrodeposition of peptide/metal hydroxide hybrids have been performed wherein the peptides act as surfactants for the electrochemical growth of unique nanostructures. [121] In a similar study, the in situ fabrication of a dipeptide/cobalt hydroxide nanocomposite was developed as electrode materials for SCs. [122]…”