Generation of Monolayer MoS 2 with 1T Phase by Spatial‐Confinement‐Induced Ultrathin PPy Anchoring for High‐Performance Supercapacitor

Integrating with conducting polymer (CP) is one of the effective ways to enhance the capacitive properties for MoS 2 except for the controllable preparation of ultrathin MoS 2 nanosheets or appropriate phase. However, most of the MoS 2 /CP composites are synthesized by traditional chemical method, in which way the structural optimization of MoS 2 is limited. Here, a facile electrochemical method is demonstrated to optimize MoS 2 by spatial‐confinement‐induced polypyrrole (PPy) anchoring. Compared with MoS 2 /PPy (MP) nanocomposites synthesized by chemical method, the electrochemical prepared possesses a concomitant MoS 2 monolayer, together with a transition from semiconductor phase (2H‐MoS 2 ) to metallic phase (1T‐MoS 2 ) during the PPy coating. Consequently, the resultant MP nanocomposite shows a remarkable capacitive performance with a high capacitance of 613 F g −1 at a current density of 1 A g −1 . Meanwhile, it possesses a good rate capability that the specific capacitance retains 74%, as the current density is increased to 10 A g −1 . The outstanding capacitive performance should be attributed to the existence of 1T‐MoS 2 monolayer and ultrathin PPy layer as well as their effective contacts.