Hierarchical NiCo@NiOOH@CoMoO₄ Core–Shell Heterostructure on Carbon Cloth for High‐Performance Asymmetric Supercapacitors

Abstract

The fabrication of low‐cost, effective, and highly integrated nanostructured materials through simple and reproducible methods for high‐energy‐density supercapacitors is highly desirable. Herein, an activated carbon cloth (ACC) is designed as the functional scaffold for supercapacitors and treated hydrothermally to deposit NiCo nanoneedles working as internal core, followed by a dip‐dry coating of NiOOH nanoflakes core–shell and uniform hydrothermal deposition of CoMoO4 nanosheets serving as an external shell. The structured core–shell heterostructure ACC@NiCo@NiOOH@CoMoO4 electrode resulted in exceptional specific areal capacitance of 2920 mF cm−2 and exceptional cycling stability for 10 000 cycles. Moreover, the fabricated electrode is developed into an asymmetric supercapacitor which demonstrates excellent areal capacitance, energy density, and power density within the broad potential window of 1.7 V with a cycling life of 92.4% after 10 000 charge–discharge cycles, which reflects excellent cycle life. The distinctive core–shell structure, highly conductive substrate, and synergetic effect of coated material results in more electrochemical active sites and flanges for effective electrons and ion transportation. This unique technique provides a new perspective for cost‐efficient supercapacitor applications.

Design and construction of hollow metal sulfide/selenide core–shell heterostructure arrays for hybrid supercapacitor

“…Therefore, investigating the relationship between electrode surface properties and electrode activity is of paramount importance for the development of high-performance electrodes. 12,13 Heterostructure is currently a focal point in surface research. Multiple studies have indicated a significant interfacial coupling between highly conductive materials and large electrochemically active materials, enabling high-speed charge transfer and efficient pseudocapacitive activity.…”

Facile Solid-State Chemical Synthesis of CoMoO4 Nanorods for High-Performance Supercapacitors

“…Cobalt molybdate materials, a kind of two-element transitional metal oxide, facilitate reversible redox reactions due to their abundant reserves and variable valence states of cobalt and molybdenum ions, and their electrochemical performance is usually better than that of single-component oxides. Moreover, cobalt and molybdenum ions display rapid electron transfer and good electrical conductivity due to their abilities to form empty d-orbitals after hybridization; therefore, cobalt molybdate (CoMoO 4 ) has been considered one of the most prospective electrode materials for supercapacitors [ 23 , 24 ]. Therefore, using different methods to prepare CoMoO 4 nanomaterials and modify them to obtain high-capacity and high-stability electrode materials has become a research hotspot in the field of supercapacitors.…”

A ZIF-67 derived NiCo-LDH nanosheet–nanourchin 3D hierarchical nanostructure for high-performance supercapacitors

“…The structured core–shell heterostructure electrode showed a capacity of 2.92 F cm −2 at 1 mA cm −2 , while the complex synthesis process increased the uncontrollability of fabrication. 24 Therefore, how to controllably manufacture a 3D hierarchical electrode with high specific capacitance, excellent rate capability and high active material loading at the same time for advanced pseudocapacitance devices is still a huge challenge.…”