A facile method for synthesizing MOF derived ZnCo2O4 particles on MXene nanosheets as a novel anode material for high performance hybrid supercapacitors. (10th February 2023)

• Record Type: Journal Article
• Authors: Kitchamsetti, Narasimharao; Kim, Daewon
• Is Part Of: Electrochimica acta. Volume 441(2023)
• Publication Date: 2023-02-10
• Subjects: MXene -- ZnCo-MOF -- ZnCo2O4 particles -- Hybrid supercapacitors; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2023.141824
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: MOF derived ZnCo2 O4 and MXene composite (MXene/ZCO) was facilely synthesized with the help of a hydrothermal technique. The fabricated HSC device delivered a high specific capacity of 260 mAh g −1 at a current density of 1 mA g −1 . A high energy density of 63.8 Wh kg −1 and a power density of 10.3 kW kg −1 were obtained for HSC device. The HSC device maintained excellent cycling stability with a retention of 91.3% capacitance after 15, 000 continuous GCD cycles. The HSC device could effectively light up a red LED, exhibiting the outstanding electrochemical properties. Abstract: MXene (MX) is a capable material for future generation supercapacitor devices. But, the attraction between active functional groups and hydrogen bonds on the surface of MX make the interlayer agglomerate obviously. In this work, we present a ZnCo-MOF (ZCM) derived ZnCo2 O4 (ZCO) particles to adsorb on the (MX) nanosheets and form a mesoporous structure which may provide the flexible ion diffusion pathways. The as obtained MXene@ZnCo2 O4 (MX@ZCO) composite is investigated using XRD, XPS, HRTEM, FESEM, and nitrogen adsorption and desorption isotherm analysis. The ZCO particles not only provide activation sites for free movement of charges but also help to avoid the agglomeration of MX nanosheets. Benefitted from this novel composite structure, MX@ZCO holds a great specific capacity of 260 mAh g −1 at the current density of 1 mA g −1 . Further, the MX@ZCO electrode exhibits a good cyclic stability of 78.9% even after 5000 cycles at the current density of 10 mA g −1, which can be ascribed to excellent electronic conductivity and short ion transport path. Furthermore, the fabricated aqueous HSC device with MX@ZCO/NF as a positive electrode and AC/NF as a negative electrode revealed a high energy density of 63.8 Wh kg −1 at power density of 3512.2 W kg −1, along with the outstanding capacitance retention of 91.3% even after 15, 000 GCD cycles. This work offers an excellent approach for the preparation of MX and ZCO composite material as an electrode for hybrid supercapacitors. Graphical abstract: Image, graphical abstract