Free-Standing Molybdenum Disulfide Composite Film Electrode for High Performance and Waterproof Flexible Supercapacitor

Abstract

Molybdenum disulfide (MoS 2 ) has been studied extensively for energy storage because of its excellent electrical properties and unique structure. In this work, the freestanding flexible composite films were prepared by reduced graphene oxide (RGO), polyaniline (PANI), and MoS 2 via a facile method. The all-solid-state flexible supercapacitor based on the ternary composite film shows good electrochemical properties. The special capacitance of supercapacitor is 643.3 mF/cm 2 (∼2144.3 F/cm 3 ). And the all-solid-state flexible supercapacitor presents no particularly obvious fading after bending 200 times. Furthermore, the ternary composite film electrode has certain waterproof effect due to the high content of MoS 2 . The ternary composite film remained high capacitance (614.9 mF/cm 2 ) after soaking in water for 8 h. This work not only develops a facile approach to prepare MoS 2 composite film with flexibility, but also provides a guideline for preparing functional supercapacitor by utilizing properties of MoS 2 such as photoelectric conversion, catalytic function and so on.

Flexible and Stretchable Energy Storage Device Based on Ni(HCO3)2 Nanosheet Decorated Carbon Nanotube Electrodes for Capacitive Sensor

“…Figure 3a demonstrates top view of pure PVA film which shows smooth surface. 9 Compared with pure PVA, the rough surface of PVA/CNT@Ni(HCO 3 ) 2 film could be observed as shown in Figure 3b and Figure S2. The cross-sectional view in Figure 3c indicates the interwoven network which could be attributed to the connection between PVA and CNTs network.…”

“…The PVA/CNT@Ni(HCO 3 ) 2 film exhibits tensile strength of 0.37 MPa with elongation at break of 450%. 9 The significant increase in tensile strength for PVA/CNT@Ni(HCO 3 ) 2 film could be attributed to the addition of CNTs. Figure S3a and b exhibit that the PVA/CNT@Ni(HCO 3 ) 2 film has strong endurance to stretching, bending, and twisting.…”

“…[5][6][7][8] Moreover, resistance to mechanical deformation such as stretching, bending, and folding is very important for flexible electronic devices due to the specific operating environment of wearable devices. 9 Supercapacitor as a novel energy storage device is attracting great attention because of excellent cycling stability and high power density. [10][11][12] Due to the diversity of electrode materials, the fabrication of supercapacitor into flexible device has been explored.…”

Performance and future directions of transition metal sulfide‐based electrode materials towards supercapacitor/supercapattery

“…The obtained electrochemical properties echoed their potential as suitable electrode materials for practical applications in next generation SCs. Wang, Hu, Ji, and Zheng (2019) prepared RGO/PANI@MoS 2 free-standing flexible ternary composite film by simple hydrothermal process. The binder-free composite material showed impressive electrochemical properties with maximum capacitance of 643.3 mF cm À2 at scan rate 10 mV s À1 with an excellent capacitance retention rate of 80% after 1000 charge-discharge cycle.…”

Facile Synthesis and Outstanding Supercapacitor Performance of Ternary Nanocomposite of Silver Particles Decorated N/S Dual-Doped Graphene and MoS2 Microspheres Stabilized by Graphene Quantum Dots

“…By combining MoS 2 with graphene, its properties can be improved. [33][34][35][36] For example, Liu's group 37 prepared MoS 2 /nitrogen-doped graphene (NG) composite by hydrothermal method. At 1 A•g −1 , the capacitance of the composite is 532 F•g −1 , which is significantly higher than both MoS 2 (80.9 F•g −1 ) and NG (350 F•g −1 ).…”