Engineering of electrodeposited binder-free organic-nickel hydroxide based nanohybrids for energy storage and electrocatalytic alkaline water splitting

Abstract

A binder-free electrodeposited organic–inorganic multifunctional nanohybrid electrode exhibits high specific capacitance with electrocatalytic water splitting performance.

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

“…Bioinspired hybrid nanomaterials have been explored in the area of sustainable energy storage considering their promising properties, such as ecofriendly behavior, flexible nature, low cost, high energy storage capacity, and cyclic stability. − Several electrode materials such as carbon materials, oxides, − hydroxides, and conducting polymers have been explored to fabricate energy-storage devices. Cobalt hydroxide-based hybrid materials have paramount importance, which provide a sustainable energy path for the generation of clean, cost-effective, and renewable energy storage properties. − Currently, researchers are engaged in the development of organic–inorganic nanohybrid materials. ,,− Organic molecules with acid functionalities have drawn considerable attention due to their binding with inorganic moieties, which form organic–inorganic nanohybrid materials. ,,− Therefore, structurally flexible and environmentally compatible self-assembling peptides with metal interacting functional groups have been used for the construction of nanohybrid materials. ,, In addition, the reported self-assembling peptides such as diphenylalanine and aromatic derivatives have exhibited immense mechanical, electrochemical, and optical properties. ,,, Rosenman et al have modified a carbon electrode with bioinspired diphenylalanine-based peptide nanotubes for supercapacitor (SC) applications . Furthermore, Wang et al have fabricated a device to light up a light-emitting diode (LED) by using a Fmoc-EF-NH 2 -based hydrogel and a thin layer of TiO 2 .…”

Engineered Nanoscale Single‐Metal‐Oxides Catalytic Thin Films for High‐Performance Water Oxidation

“…The catalyst deposited at glassy carbon (GC) electrode was shown to achieve a current density of 10 mA cm −2 at just 289 mV in 1 m potassium hydroxide (KOH) solution [19b] . Recently, FeSn 2 nanostructures electrophoretically deposited over nickel foam and fluorine‐doped tin oxide (FTO) surface were used as anode materials and presented good catalytic activity and stability for OER reaction under alkaline conditions [22b] . In separate research, pure phase and highly crystalline Cu 9 S 5 obtainable from molecular precursor was electrophoretically deposited over conducting nickel foam for catalytic applications.…”

“…In separate research, pure phase and highly crystalline Cu 9 S 5 obtainable from molecular precursor was electrophoretically deposited over conducting nickel foam for catalytic applications. The catalyst presents good OER performance and remarkable stability for OER under alkaline conditions [22c] . Likewise, plenty of methods have been practised for catalyst synthesis.…”

“…A variety of methods has been investigated to produce free‐standing thin‐film catalysts, including physical vapor deposition, [ 20 ] chemical vapor deposition, electro‐anodization, EPD, and electrochemical deposition method. [ 21–22 ] Previously, CoO nanoparticles obtainable from pyrolysis of Co oxalate nanoplates‐based precursors were used as a catalyst for OER reaction. The catalyst deposited at glassy carbon (GC) electrode was shown to achieve a current density of 10 mA cm −2 at just 289 mV in 1 m potassium hydroxide (KOH) solution [19b] .…”

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

“…Emerging as new class of advanced functional materials with nanoscale architectures and redox properties, organic–inorganic nanohybrids have been reported for several applications such as gas separation and storage, energy storage, sensors, and catalysis. − Organic–inorganic nanohybrids with an organic component cross-linked with an inorganic component through different covalent and noncovalent interactions lead to additional synergistic properties for diverse areas of applications. , Organic components such as biomolecules, π-conjugated molecules with various functionalities, offer molecular self-assembly and redox properties. , Molecular self-assembly in organic–inorganic nanohybrids with balanced hydrophobic–hydrophilic character of the organic component enables the formation of a cross-linked network with various nanoscale architectures. − However, the inorganic component provides various electrochemical properties and physical properties such as thermal stability. Therefore, organic–inorganic nanohybrid-based electrodes can be used as electrocatalysts for energy conversion .…”