One‐Step Preparation of NiV‐LDH@CNT Hierarchical Composite for Advanced Asymmetrical Supercapacitor

Abstract

As one of the supercapacitor materials, nickel–vanadium layered double hydroxide (NiV‐LDH) has received wide attention, but poor electrochemical stability and capacitance constrain their applications. Carbon nanotubes (CNTs) enable solving these issues. Herein, NiV‐LDH@CNT is well designed and prepared through a facile one‐step refluxing method, which is free of high temperature and complicated equipment. Benefiting from the hierarchical and accessible structure, the NiV‐LDH@CNT composite indicates a high specific capacitance (1493 F g−1 at a current density of 1 A g−1 and 432 F g−1 at 50 A g−1). It also has 68.8% cycling durability after 1000 charge/discharge cycles at 20 A g−1, compared with that of NiV‐LDH of 28.1%. Furthermore, the asymmetric supercapacitors (ASCs) with activated carbon (AC) and NiV‐LDH@CNT are fabricated by the screen‐printing method. Surprisingly, the as‐fabricated NiV‐LDH@CNT//AC ASC device can achieve an ideal specific capacitance (85 F g−1 at 2 A g−1) and a large energy density (95.6 Wh kg−1 at a power density of 5417.8 W kg−1), which can be a great promising candidate for electrodes in the energy storage device.

Layered Double Hydroxide with Interlayer Quantum Dots and Laminate Defects for High‐Performance Supercapacitor

“…Figure S14 (Supporting Information) displays the CV curves of CuCo-LDH-S/ZnS-QDs at the scan rates from 2 to 50 mV s −1 , where the obvious symmetric anodic and cathodic peaks imply a fast and reversible redox reaction described in the following formula and electrochemical diffusion-controlled process. [38] Moreover, the quite similar shapes of the CV curves for different scan rates display an excellent rate performance with effective charge transfer kinetics.…”

Facile fabrication of NiCo-LDH on activated rice husk carbon for high-performance all-solid-state asymmetric supercapacitors

“…It is an effective method to improve this situation by combining it with a carbon material to form a 3D structural composite. [23][24][25][26][27] Activated carbon is an electrode material commonly used in supercapacitors. It stands out among many carbon materials due to its good electrical conductivity, low cost, and good chemical stability.…”

Carbon Nanotube@Nickel Hydroxide Nanosheets Core–Shell Nanostructures Enabling Thermally Assisted 3D‐Printed Solid‐State Microsupercapacitors

“…[8,[12][13][14] It is common knowledge that electrode materials also have a significant impact on the performance of MSCs. [15][16][17] Nickel hydroxide (Ni(OH) 2 ) materials stand out among various materials as a wise choice because of their fulfilling specific capacity, affordability, ease of acquisition, and environmental compatibility. [2] However, the application of Ni(OH) 2 materials into utilization is severely constrained by their poor electrical and ion conductivity.…”