Energy & Fuels, Vol.35, No.3, 2692-2703, 2021
Novel Robust Nanohybrids of Pompon-like MoS2 and N/S Dual-Doped Graphene for High-Performance Asymmetric Supercapacitors
The nanohybrids of pompon-like molybdenum disulfide (p-MoS2) and N/S dual-doped graphene (NSG) have been successfully synthesized through an in situ self-assembly by a hydrothermal method. The morphology, structure, and composition of the as-prepared products were analyzed by SEM, TEM, XPS, Raman, and XRD. The effect of p-MoS2 content on the properties of nanohybrids was studied and compared with that of ordinary molybdenum disulfide (o-MoS2). When the p-MoS2 mass ratio is 40%, the nanohybrids of p-MoS2 and NSG (p-MoS2/NSG40) formed a uniform and stable composite structure. The p-MoS2/NSG40 exhibits not only high specific capacitance (549.4 F g(-1) at 10 mV s(-1)) but also an excellent capacitance retained ratio of 93.2% after 10 000 constant current charge/discharge loops (at 20 A g(-1)), which is significantly higher than that of o-MoS2/NSG40 (488.6 F g(-1), 87.5%). An asymmetric supercapacitor assembled by using p-MoS2/NSG40 and NSG as the anode and cathode electrodes possesses a large voltage window (1.8 V vs SCE), high energy densities at all charge/discharge conditions (65.2 Wh kg(-1) at the power density of 900 W kg(-1)), and an excellent cycling stability (91.7% after 10 000 loops).