In situ growth of chrysanthemum-like NiCo2S4 on MXenes for high-performance supercapacitors and a non-enzymatic H2O2 sensor. Issue 23 (28th May 2020)

• Record Type: Journal Article
• Authors: Li, Yue; Kamdem, Pascal; Jin, Xiao-Juan
• Is Part Of: Dalton transactions. Volume 49:Issue 23(2020)
• Page Start: 7807
• Page End: 7819
• Publication Date: 2020-05-28
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d0dt01030h
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Schematic of the process for the growth of MXene/NiCo2 S4 hybrid. Abstract : In this work, we developed a novel strategy to couple chrysanthemum-like NiCo2 S4 in situ -grown MXene hybrids into a three-dimensional (3D) sandwich architecture hybrid as an electrode material for high-performance asymmetric supercapacitors and non-enzymatic H2 O2 sensors. In the 3D sandwich architecture hybrid, the NiCo2 S4 particles were encapsulated by MXene layers, which enhanced the interlayer space of MXene, significantly improving the electrochemical properties. In particular, the MXene/NiCo2 S4 1 : 2 electrode achieved a specific capacitance of 1266 F g −1 at 0.5 A g −1 and maintained 95.21% of its initial value after 10 000 cycles. Furthermore, an asymmetrical supercapacitor was also fabricated using MXene/NiCo2 S4 1 : 2 as the positive electrode and activated carbon (AC) as the negative electrode (MXene/NiCo2 S4 1 : 2//AC), which exhibited exceptional electrochemical performance. MXene/NiCo2 S4 1 : 2//AC exhibited a large specific capacitance of 621 F g −1 at 0.5 A g −1 and energy density of 72.82 W h kg −1 at a power density of 0.635 kW kg −1 . In addition, MXene/NiCo2 S4 1 : 2 was employed as a non-enzymatic sensor for the electrochemical detection of H2 O2, which exhibited a high sensitivity of 0.267 μA μM −1 cm −2 and noteworthy low detection limit of 0.193 μM based on 3 signal-noise ratios. This research provides a facile route for the in situ growth of bimetallic sulfides on MXenes as electrode materials for energy storage and electrochemical detection.