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

Abstract

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.

Synergistic Effect of ZnO and Acid‐Functionalised Carbon Nanotubes on Improving the Specific Capacitance of Poly(ortho‐Phenylenediamine‐co‐Aniline)‐Based Wearable Electronics

“…PVA/KOH was used as the electrolyte and the separator. It was then placed carefully inside a typical Swagelok cell setup for further electrochemical studies [33] . A schematic representation of the whole process is represented in Figure 1.…”

“…It was then placed carefully inside a typical Swagelok cell setup for further electrochemical studies. [33] A schematic representation of the whole process is represented in Figure 1. The potential window of À 0.2-0.4 V and the scan rate of 5-100 mV s À 1 was used to measure the cyclic voltammograms.…”

Synthesis and Structural Studies of Nucleobase Functionalized Hydrogels for Controlled Release of Vitamins

“…A recent review described the biomedical applications of such dynamic boronate esters cross-linked guanosine-quadruplex hydrogels . The supramolecular functional materials developed via the self-assembly of peptide biomolecules have been studied thoroughly over the past few years. − The self-assembly of the peptide-based molecules including peptide bolaamphiphiles, aromatic N-terminal capped peptides, and short hybrid peptides led to the formation of different varieties of supramolecular nanostructures like vesicles, nanofibers, micelles, nanotubes, and ribbons. − Therefore, these peptide-based supramolecular architectures find promising applications in various fields like drug delivery, cancer therapy, and tissue engineering. − We envisioned the synthesis of an epitope assembled from a nucleobase and an amino acid resulting in biomaterial with a unique self-assembling behavior. Guanine, a purine nucleobase, potentially forms a G-quadruplex skeleton in the presence of suitable monovalent alkali metal ions because of the presence of multiple hydrogen bonding donor and acceptor sites.…”

Reticulated TiO2-Modified Carbon Fiber Enabling as a Supercapacitor Electrode Material for Photoelectric Synergistic Charge Storage

“…They showed that the electrode only presented a lower specific capacitance of 19 mF cm –2 . Fortunately, coupling TiO 2 to remarkable conductivity materials is one of the most effective measures to optimize the conductivity of TiO 2 . , CF is one of the prime candidates due to its low cost and remarkable conductivity. − However, due to its insufficient specific surface area (SSA), it is impractical to employ CF as an active ingredient for advanced energy storage devices. Both the activation and template methods are two of the most common efforts to increase the SSA. , For instance, Bonso et al prepared a flexible carbon fiber by the pyrolysis of electrospun polymers.…”