Construction of KCu7S4@NiMoO4 three-dimensional core-shell hollow structure with high hole mobility and fast ion transport for high-performance hybrid supercapacitors

Construction of Binder‐Free, Self‐Supported, Hetero‐Core–Shell Honeycomb Structured CuCo2O4@Ni0.5Co0.5(OH)2 with Abundant Mesopores and High Conductivity for High‐Performance Energy Storage

“…Moreover, in the CCO@N 0.5 C 0.5 OH/NF composite, the intensity of the Cu 2p feature peak shows a decrease, which can be attributed to the generation of N 0.5 C 0.5 OH nanosheet arrays that increase the thickness of the as‐formed composite, thereby causing the Cu element to be embedded deeper within the material. [ 20 ] High‐resolution spectra of the respective elements were obtained using Gaussian fitting analysis. In the C 1s spectrum of CCO@N 0.5 C 0.5 OH/NF (Figure 4b), three distinct characteristic peaks are observed at 288.48, 286.48, and 284.88 eV, corresponding to C═O, C─O, and C─C, respectively.…”

“…[14][15][16] In recent years, researchers have focused on developing and investigating new ecofriendly electrode materials (e.g., graphene, titanium dioxide nanotubes, and metal oxide nanoparticles) with high theoretical specific capacitance. [17][18][19] However, these active materials require additional nonconductive adhesives for the electrode assembly, [20] which leads to a significant amount of "dead volume" inside the electrode material, [21] impeding ion/electron conduction, [22] resulting in slow reaction kinetics and aggravated agglomeration of the active material. [23] The optimal design strategy for electrode materials is to grow the active material directly on a multinetwork conductive substrate with certain mechanical strength and robust conductivity to constitute a binder-free and self-supported electrode material.…”

Road Map for In Situ Grown Binder‐Free MOFs and Their Derivatives as Freestanding Electrodes for Supercapacitors

“…The setbacks from carbonaceous materials with poor capacitance and low energy density and in the pursuit of suitable alternative hollow structures gained the attention of researchers due to their fascinating features such as large surface area, short diffusion length, and ample reactive sites for faradaic redox reactions. [151] Inspired by the previous works on bimetallic sulfides with hollow mesoporous architecture drawing inspiration from hollow carbonaceous catalysts and combining the advantage of multi-ion doping, Haung et al [152] designed ternary sulfide using ZnCo-MOF as a sacrificial template on NF, and sulfurized along with Ni to have NiZnCoS/NF by varying amount of Zn precursor. The electrocatalyst grown from the ZnCo-MOF template retained its structure after sulfurization and acquired a unique hollow structure with pores as depicted in Figure 14A.…”

Scalable Synthesis of Ni3B2O6 Nanograins and Fabrication of a Coin Cell Supercapacitor for Powering Temperature Sensor Devices

“…14−16 Theoretically, all transition metals are capable of combining with boron to form a variety of borates and borides. 17,18 So far, various experimental approaches such as electrodeposition, solvothermal, solid-state chemical reaction, in situ co-reduction, microwave irradiation, direct precipitation, liquid-phase reaction, hydrothermal techniques, and direct precipitation have been adopted to synthesize them. Nickel-based composite materials such as Ni(OH) 2 , 19 NiS, 20 and Ni 2 P 21 have been examined broadly and employed as electrode materials for supercapacitors exhibiting remarkable electrochemical performance.…”

“…Various attempts were made to develop nickel-based electrode materials due to their greater theoretical specific capacity, variable oxidation states, excellent electrochemical stability, and environmental friendliness. − Henceforth, oxides, sulfides, and selenides of nickel materials are exhaustively studied for electrochemical energy conversion and storage applications. − As compared to other compounds, transition metal borates have been rarely used in batteries, supercapacitors, electrocatalysis, and electrochemical sensors, even though borates are good candidates for these applications. − Theoretically, all transition metals are capable of combining with boron to form a variety of borates and borides. , So far, various experimental approaches such as electrodeposition, solvothermal, solid-state chemical reaction, in situ co-reduction, microwave irradiation, direct precipitation, liquid-phase reaction, hydrothermal techniques, and direct precipitation have been adopted to synthesize them. Nickel-based composite materials such as Ni­(OH) 2 , NiS, and Ni 2 P have been examined broadly and employed as electrode materials for supercapacitors exhibiting remarkable electrochemical performance. , However, these materials, when used alone, often exhibit low electrochemical conductivity, which cannot fulfill the high power density requirement, and hence, carbon or conductive polymers must be added to them .…”