Decoration of green synthesized S, N-GQDs and CoFe2O4 on halloysite nanoclay as natural substrate for electrochemical hydrogen storage application

Abstract

Halloysite nanotubes (HNTs) with high active sites are used as natural layered mineral supports. Sulfur- and nitrogen-co doped graphene quantum dots (S, N-GQDs) as conductive additive and CoFe2O4 as the electrocatalyst was decorated on a HNT support to design an effective and environmentally friendly active material. Herein, an eco-friendly CoFe2O4/S, N-GQDs/HNTs nanocomposite is fabricated via a green hydrothermal method to equip developed hydrogen storage sites and to allow for quick charge transportation for hydrogen storage utilization. The hydrogen storage capacity of pure HNTs was 300 mAhg−1 at a current density of 1 mA after 20 cycles, while that of S, N-GQD-coated HNTs (S, N-GQDs/HNTs) was 466 mAhg−1 under identical conditions. It was also conceivable to increase the hydrogen sorption ability through the spillover procedure by interlinking CoFe2O4 in the halloysite nanoclay. The hydrogen storage capacity of the CoFe2O4/HNTs was 450 mAhg−1, while that of the representative designed nanocomposites of CoFe2O4/S, N-GQDs/HNTs was 600 mAhg−1. The halloysite nano clay and treated halloysite show potential as electrode materials for electrochemical energy storage in alkaline media; in particular, ternary CoFe2O4/S, N-GQD/HNT nanocomposites prove developed hydrogen sorption performance in terms of presence of conductive additive, physisorption, and spillover mechanisms.

Sonochemical synthesized BaMoO4/ZnO nanocomposites as electrode materials: A comparative study on GO and GQD employed in hydrogen storage

“…Recently, researchers studied N, S-GQDs in hydrogen storage. The results exhibited that N -GQDs and S-GQDs improved hydrogen storage performance [43] .…”

Bimetallic MnFe2-MOF and Its Derived MnFe2O4 Nanostructures for Supercapacitive Applications

“…13−15 Based on their charge-storing operation, supercapacitors are classed as electric double-layer capacitors or pseudocapacitors and the supercapacitor device is characterized as symmetric, asymmetric, or hybrid based on the electrode materials employed in its fabrication. 16,17 Metal−organic frameworks (MOFs) are crystalline porous materials with attractive features like enormous surface area, well-defined crystalline structure, low density, effortlessly tunable structure, and highly organized pores/channels. Metal−ligand coordination, metal cluster copolymerization, and interactions between hydrogen bonds have all been used in assembling these frameworks.…”

“…In addition, the capacitance and voltage can be enhanced by combining a pseudocapacitive electrode with an electric double-layer electrode, as in a hybrid supercapacitor device. Utilizing porous materials in supercapacitors boosts energy density by enhancing specific capacitance and extending the operating potential window of electrode materials. − Based on their charge-storing operation, supercapacitors are classed as electric double-layer capacitors or pseudocapacitors and the supercapacitor device is characterized as symmetric, asymmetric, or hybrid based on the electrode materials employed in its fabrication. , …”

Synthesis of Bone Meal-derived 4-Carboxyphenylboronic Acid Functionalized Sulfur and Nitrogen Co-doped Graphene Quantum Dots Nanoprobe for Sialic Acid Sensing

“…12 As explained, heteroatom doping in GQDs raised the aggregate capability of fluorescence-based sensors for extremely sensitive and selective analyte recognition. 15,16 For the design of heteroatom-doped GQDs, the preference for green precursor has been reported 17 to avoid exposure to chemicals followed by toxicity. 10 Moreover, the use of biomass such as honey, orange juice, green tea extract, rice husk, etc.…”