Oxygen-Incorporated and Polyaniline-Intercalated 1T/2H Hybrid MoS₂ Nanosheets Arrayed on Reduced Graphene Oxide for High-Performance Supercapacitors

This work synthesizes the hybrid 1T/2H phase MoS 2 nanosheets array on reduced graphene oxide for high-performance supercapacitors under extreme environmental temperature via oxygen incorporation and polyaniline intercalation method. The oxygen incorporation, which leads to the formation of MoS 2 with hybrid phase of 1T and 2H structure, and polyaniline intercalation provide excellent conductivity and expand the interlayer distance of MoS 2 . Meanwhile, the sandwiched oxygen-incorporated MoS 2 /polyaniline nanosheet array aligns on reduced graphene oxide, creating sufficient heterointerface among polyaniline, MoS 2, and reduced graphene oxide, which constructs a conducting network that is beneficial for charge transfer and structure stability. The obtained oxygen-incorporated MoS 2 /polyaniline/reduced graphene oxide hierarchical nanosheets exhibit a capacitance of 752.0 F g –1 at 1 A g –1 in 1 M H 2 SO 4 in a three-electrode system. When cycles at 50 A g –1 for 50 000 cycles, it has a capacitance retention of 80.4 % for the initial cycle (282.3 F g –1 ). The material shows excellent performance in an extremely wide range of temperatures. The symmetric cell has capacitances of 79.6, 100.1, and 122.0 F g –1 at 2 A g –1 at 0 °C, room temperature, and 50 °C and maintains about 89.9, 86.1, and 73.9% of the initial capacitance, respectively, after 30 000 cycles.