Three-Dimensional MoS₂/Graphene Hybrid Aerogel as Free-Standing, High-Performance Electrode for Supercapacitor

Abstract

Carbon materials are generally employed as supercapacitor electrodes due to their low- cost, high-chemical stability and environmental friendliness. However, the design of carbon structures with large surface area and controllable porous structure remains a daunt challenge. In this work, a three-dimensional (3D) hybrid aerogel with different contents of MoS2 nanosheets in 3D graphene aerogel (MoS2-GA) was synthesized through a facial hydrothermal process. The influences of MoS2 content on microstructure and subsequently on electrochemical properties of MoS2-GA are systematically investigated and an optimized mass ratio with MoS2: GA of 1:2 is chosen to achieve high mechanical robustness and outstanding electrochemical performance in the hybrid structure. Due to the large specific surface area, porous structure and continuous charge transfer network, such MoS2-GA electrodes exhibit high specific capacitance, good rate capability and excellent cyclic stability, showing great potential in large-scale and low-cost fabrication of high-performance supercapacitors.

Carbon nanomaterials and their composites for supercapacitors

“…The prepared films have high capacitance (300 F/g), superior rate performance (199 F/g at 500 A/g), and good cycle stability (10,000 cycles at 20 A/g, the capacitance remains 92%). Meng et al 89 prepared a 3D hierarchical nanostructure decorated with MoS 2 on GA nano template by surface hydrothermal method and used it as a high‐performance electrode of supercapacitor. MoS 2 ‐GA hybrid electrode has high area capacitance (0.32 F/cm 2 ), good rate performance, and good cycle stability (the capacitance is maintained at 92% at 5000 cycles).…”

MXene/Silver Nanowire-Based Spring Frameworks for Highly Flexible Waterproof Supercapacitors and Piezoelectrochemical-Type Pressure-Sensitive Sensor Devices

“…In Figure 3c, AgMX presents an outstanding specific capacitance of 497 F g −1 at 0.5 A g −1 , exhibiting superior than recent reports, such as MXenereduced graphene oxide aerogel (128.6 F g −1 ), 21 thionine-functionalized 3D graphene aerogel (384 F g −1 ), 22 and MoS 2 -GA (336 F g −1 ). 23 The outstanding performance depends on synergistic effects of well conductivity and cross-linking porosity for AgMX, which favors the electron transport and ion transfer during the electrochemical energy storage process. This is proved by EIS results, illustrating low contact and charge-transfer resistance in Figure 3d.…”

Preparation and properties of aminated MXene cross-linked polyimide aerogels

“…[1][2][3][4][5][6] Because of its unique nanoporous network structure, [7][8][9][10] aerogel has the characteristics of low density, high porosity, and low thermal conductivity and is widely used in aerospace, electronic communication, flame retardant and thermal insulation, energy storage, adsorption, catalysis and sensing. [11][12][13][14] Polyimide (PI) and other organic aerogels with excellent properties have received a lot of attention. [15][16][17][18] In addition, PI aerogel also has the following characteristics superior to other organic aerogels:…”