In‐situ nano‐engineering of amorphous MoS ₂ nanosheets with carbon dots for enhanced supercapacitor performances

Abstract

Amorphous materials have snatched special attention for electrochemical energy storage applications owing to the presence of plenty of activate sites for energy storage. Herein, we report the microwave-assisted-hydrothermal synthesis of amorphous MoS 2 with some 1T phase and in-situ-nano-engineering with C-dots for energy storage application. The specific capacitance (C s ) of a-MoS 2 /C-dots was found to be 1368 F g À1 (at 1 A g À1 ), which is $ 2.9 and 1.65 times higher than a-MoS 2 (without C-dots) and crystalline c-MoS 2 /C-dots. Capacitance is also strongly dependent on synthesis methods: C s of a-MoS 2 /Cdots is 2.15 times higher than h-MoS 2 /C-dots produced by the normalhydrothermal method. The asymmetric supercapacitor was designed using a-MoS 2 /C-dots as cathode and activated-carbon as anode showing C s 180.82 F g À1 at a maximum potential of 1.5 V. Energy density (ED) of 56.5 W h kg À1 at a power density (PD) of 750 W kg À1 with excellent capacitance retention was observed. The high C s of a-MoS 2 /C-dots can be attributed to amorphous MoS 2 , formation of metallic 1T phase, good charge transport, and strong catalyst support interaction. This synthesis and in-situ nano engineering method of MoS 2 may provide a promising technique for developing a high-performance supercapacitor for energy storage applications. K E Y W O R D S alkaline medium, amorphous MoS 2 , carbon dot, energy storage applications, MoS 2 , supercapacitor

One-Dimensional Ni-MIL-77 Metal–Organic Framework as an Efficient Electrode Nanomaterial for Asymmetric Supercapacitors

“…Thus, it is crucial to create energy storage systems that are effective. , Between all the energy storage systems, like conventional capacitors and batteries, supercapacitors fill the gap . Due to their good sustainability and environmental friendliness, supercapacitors have emerged as attractive contenders in the field of electrochemical energy storage . Supercapacitors, having several advantages, like high power density (PD), short discharge/charge times, and exceptional cycling capability, are considered efficient renewable energy storage devices compared to other conventional energy storage devices. − Low energy density (ED), however, continues to be an obstacle to the widespread usage of supercapacitors .…”