Two-dimensional molybdenum disulfide (MoS 2 ) is a promising electrode material for supercapacitors, attributing to attractive physical properties, outstanding electrical properties, and ultrahigh exposed surface area. However, MoS 2 bulk suffers from low capacity due to the overlaying of the layers and the poor electric conductivity. Covalent functionalization of MoS 2 is a promising, yet challenging, approach to overcome the drawbacks and boost electrochemical performance. Here, we report a series of sandwich-like 4-aminophenyl functionalized MoS 2 /polyaniline (MoS 2 –NH 2 /PANI) nanosheets by in situ growth of PANI on MoS 2 –NH 2 templates. The optimized MoS 2 –NH 2 /PANI nanosheets express a high capacitance of 326.4 F g –1 at 0.5 A g –1 and a superior rate retention of 63.1% when the current density increased from 0.5 A g –1 to 1000 A g –1 in a three-electrode system. Impressively, the corresponding symmetric supercapacitors deliver an electrochemical cycling stability with 96.5% retention after 10000 cycles at 5 A g –1 . Our strategy of covalent linking PANI onto functional MoS 2 provides a feasible approach to improve the electrochemical performance of MoS 2 -based materials for energy storage.
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Zeng et al. (2019) studied this question.