MOF-derived MoS2/nitrogen-doped graphene aerogel for supercapacitor electrodes

Abstract

MOFs-derived MoS₂ with 1T/2H mixed phase was synthesized by a simple one-step hydrothermal method, and MOFs-derived MoS₂/N-GA were formed by assembling them with nitrogen-doped graphene aerogel (N-GA). The morphology, structure and chemical composition of MOFs-derived MoS₂/N-GA were characterized by XRD, SEM, TEM, Raman, XPS and FTIR. In addition, the capacitive behavior, energy storage property, and charge transfer capability of the composites were analyzed using electrochemical tests (cyclic scanning voltammetry, constant current charge/discharge, and electrochemical impedance). The results showed that the use of N-GA as the carrier of MOFs-derived MoS₂ not only enhanced the electrical conductivity of the composites, but also reduced the volume expansion and contraction of MoS₂ in the process of charging and discharging due to its unique three-dimensional structure. As the doping amount of N-GA changed from 10 % to 30 %, the capacitive performance of MNGA20 (20 % N-GA) was superior to that of MNGA10 (10 % N-GA) and MNGA30 (30 % N-GA) at scanning rates from 5 to 100 mV/s. MNGA20 composites exhibited the smallest charge transfer resistance and optimal specific capacitance of 530 F/g at 1 A/g, and retained 80.2 % capacitance after 1000 charge-discharge cycles at 10 A/g. These results provided valuable insights for developing high-performance electrode materials, highlighting the promising application of MOFs-derived MoS₂/N-GA in supercapacitor devices.