In situ growth of Chrysanthemum-like NiCo2S4 on MXene for High-performance Supercapacitors and Non-enzymatic H2O2 Sensor
In this work, we developed a novel strategy to couple chrysanthemum-like NiCo2S4 in situ grown MXene hybrids into three-dimensional (3D) sandwich architecture hybrid as electrode materials for high performance asymmetric supercapacitor and non-enzymatic H2O2 sensor. In the 3D sandwich architecture hybrid, the NiCo2S4 particles are encapsulated by the MXene layers which could enhance the interlayer space of MXene, significantly improving the electrochemical properties. Especially, the MXene/NiCo2S4 1:2 electrode has achieved a specific capacitance of 1266 F g-1 at 0.5 A g-1 and maintained 95.21% of its initial values after 10000 cycles. Furthermore, asymmetrical supercapacitor has also been fabricated using MXene/NiCo2S4 1:2 as positive electrode and activated carbon (AC) as negative electrode (MXene/NiCo2S41:2//AC) which exhibits exceptional electrochemical performance. The MXene/NiCo2S41:2//AC exhibits a large specific capacitance of 621 F g-1 at 0.5 A g-1, and energy density of 72.82 Wh kg-1 at a power density of 0.635 kW kg-1. In addition, the MXene/NiCo2S4 1:2 is also employed as nonenzymatic sensors for the electrochemical detection of H2O2, which exhibit a high sensitivity of 0.267 µA µM-1cm-2 and noteworthy lower detection limit 0.193 µM based on 3 signal-noise ratios. The research provides a facile routine for developing in situ growing of bimetallic sulfide on MXene as the electrode materials in energy storage and electrochemical detection.