Ethanol‐Induced Ni²⁺‐Intercalated Cobalt Organic Frameworks on Vanadium Pentoxide for Synergistically Enhancing the Performance of 3D‐Printed Micro‐Supercapacitors

Abstract

The synthesis of metal‐organic framework (MOF) nanocomposites with high energy density and excellent mechanical strength is limited by the degree of lattice matching and crystal surface structure. In this study, dodecahedral ZIF‐67 is synthesized uniformly on vanadium pentoxide nanowires. The influence of the coordination mode on the surface of ZIF‐67 in ethanol is also investigated. Benefitting from the different coordination abilities of Ni2+, Co2+, and N atoms, spatially separated surface‐active sites are created through metal‐ion exchange. Furthermore, the incompatibility between the d8 electronic configuration of Ni2+ and the three‐dimensional (3D) structure of ZIF‐67 afforded the synthesis of hollow structures by controlling the amount of Ni doping. The formation of NiCo‐MOF@CoOOH@V2O5 nanocomposites is confirmed using X‐ray absorption fine structure analysis. The high performance of the obtained composite is illustrated by fabricating a 3D‐printed micro‐supercapacitor, exhibiting a high area specific capacitance of 585 mF cm−2 and energy density of 159.23 µWh cm−2 (at power density = 0.34 mW cm−2). The solvent/coordination tuning strategy demonstrated in this study provides a new direction for the synthesis of high‐performance nanomaterials for electrochemical energy storage applications.

Defect-Induced and Synergistic Na-Ion Storage Capability of TiO2(B)@MoSe2/Carbon Trinity for Ultrafast and Ultralong Cycling

“…The b -values can be calculated from the slope of the linear fitting of log­( i ) vs. log­( v ) plots (Figure b). A b -value of 0.5 suggests a diffusion-controlled battery behavior, while a b -value of 1.0 suggests a surface-controlled capacitive behavior. − The b -values of peak 1, peak 2, peak 3, and peak 4 are 1.010, 0.984, 0.893, and 0.939, respectively. The values are all close to 1.0, indicating that the electrode reactions of N-TiO 2 (B)@MoSe 2 /N,P-C are mainly dominated by surface-controlled pseudocapacitive behavior.…”

Controlled preparation of CoNi2S4 nanorods derived from MOF-74 nanoarrays involving an exchange reaction for high energy density supercapacitors

“…23 However, the electrode materials prepared from MOF-74 are mostly in the powder form and tend to agglomerate during testing, resulting in poor stability and hindering their application in energy storage. 24 A common approach is that the connection between the conductive substrate and the electrode material can be improved by an in situ synthesis method. Although direct sulfidation allows the preparation of different morphologies of metal sulfides, it also leads to the destruction of the original structure.…”

Synergistic Enhancement of Capacitance of Amorphous CuBHT/MoS2 Hybrids

“…Metal–organic coordination polymers, a kind of polymer constructed alternately connected by an organic ligand and a metal ion, have been widely used in the field of electrochemical energy storage due to the high specific surface area, adjustable electronic structure, multiactive sites, and controllable morphology. , Furthermore, they can achieve relatively high conductivity by rational selection of organic and metal subunits . Therefore, hybridizing them with MoS 2 is expected to obtain hybrid materials with improved energy storage performance and the conductivity of MoS 2 .…”