Facile self-assembly of sandwich-like MXene/graphene oxide/nickel–manganese layered double hydroxide nanocomposite for high performance supercapacitor

A sandwich-like CoNiLDH@rGO@CoNi2S4 electrode enabling high mass loading and high areal capacitance for solid-state supercapacitors

“…The above results reveal that CoNiLDH is semiconductive and CoNi 2 S 4 has stronger metallic properties; due to the different energy band structures, electrons are spontaneously transferred from CoNi 2 S 4 with a higher Fermi level to CoNiLDH through the heterogeneous interface. 32 When forming a heterogeneous junction, the electric displacement at the boundary is continuous, but the electric field is different (the two materials have different dielectric constants), and the sudden change of the energy band can lead to sharp peaks or depressions, thus affecting the carrier transport. 26…”

“…As shown in Fig.S1, † the d-orbitals of Co and Ni and the p-orbitals of O are the main sources of valence bands and conduction bands in CoNiLDH, while for CoNi 2 S 4 in Fig.S2, † the d-orbitals of Co and Ni atoms are the main components of the valence band, and the p-orbitals of S make a small contribution. The above results reveal that CoNiLDH is semiconductive and CoNi 2 S 4 has stronger metallic properties; due to the different energy band structures, electrons are spontaneously transferred from CoNi 2 S 4 with a higher Fermi level to CoNiLDH through the heterogeneous interface 32. When forming a heterogeneous junction, the electric displacement at the boundary is continuous, but the electric eld is different (the two materials have different dielectric constants), and the sudden change of the energy band can lead to sharp peaks or depressions, thus affecting the carrier transport 26.…”

Flower-like Heterogeneous Phosphorus-Doped Co3S4@Ni3S4 Nanoparticles as a Binder-free Electrode for Asymmetric All-Solid-State Supercapacitors

“…In recent years, researchers have been trying to find new electrode materials that can greatly improve the electrochemical performance of all-solid-state supercapacitors. Transition metal-based materials have attracted extensive attention due to their rich redox reactions, various oxidation states, environmental friendliness, abundance of resources, and low cost. , Among transition metal-based materials, transition metal oxides/hydroxides are highly sought after because of their high theoretical specific capacitance and simple preparation method. , The porous single-crystal NiO nanosheet array was in-situ synthesized on nickel foam by a simple hydrothermal method, which combined with the cross-linked single-crystal structure and the porous structure. The prepared NiO electrode material showed a specific capacitance of 716 F g –1 at 1 A g –1 .…”

“…4,5 Among transition metal-based materials, transition metal oxides/hydroxides are highly sought after because of their high theoretical specific capacitance and simple preparation method. 6,7 The porous single-crystal NiO nanosheet array was in-situ synthesized on nickel foam by a simple hydrothermal method, 8 which combined with the cross-linked single-crystal structure and the porous structure NiO electrode material showed a specific capacitance of 716 F g −1 at 1 A g −1 . Fang et al prepared three-dimensional flowerlike MnO 2 /Ni(OH) 2 composites by simple microwave irradiation, 9 which has a high specific capacitance of 506 F g −1 at 16.7 A g −1 .…”

Progress of layered double hydroxide-based materials for supercapacitors

“…The MXene/graphene oxide/NiMn-LDH (MGL) material prepared by Chen et al 242 also makes reasonable use of the advantages of the heterostructure (Fig. 18(d)).…”