Abstract
Although graphene has been widely used as a nano-filler to enhance the conductivity of porous materials, it is still an unsatisfactory requirement to prepare graphene-based sponge porous materials by simple and low-cost methods to enhance their mechanical properties and make them have good sensing and capacitive properties. Graphene platelets (GnPs) were prepared by the thermal expansion method. Graphene-based sponge porous materials were prepared by a simple method. A flexible sensor was formed and supercapacitors were assembled. Compared with other graphene-based composites, the graphene-based composite sponge has good electrical response under bending and torsion loading. Under 180° bending and torsion loading, the maximum resistance change rate can reach 13.9% and 52.5%, respectively. The linearity under tension is 0.01. The mechanical properties and capacitance properties of the sponge nanocomposites were optimized when the filler fraction was 1.43 wt.%. The tensile strength was 0.236 MPa and capacitance was 21.4 F/g. In cycles, the capacitance retention rate is 94.45%. The experimental results show that the graphene-based sponge porous material can be used as a multifunctional flexible sensor and supercapacitor, and it is a promising and multifunctional porous nanocomposite material.
Highlights
In recent years, porous materials have been widely used in superhydrophobic materials, adsorption materials, electronics, and other fields owing to their porous, loose, and flexible characteristics [1,2,3].Conductive porous materials have unique porous structure and demonstrate excellent electrical conductivity, enabling them to have a broad prospective application in various fields such as flexible sensing, electrochemistry, and supercapacitors [4,5,6]
The graphite intercalation compounds were heat-treated in a muffle furnace at processing such as ultrasonication separates stacked graphene layers until a few layers remain, which
Graphene platelets (GnPs) were synthesized by thermal expansion and peeling
Summary
Conductive porous materials have unique porous structure and demonstrate excellent electrical conductivity, enabling them to have a broad prospective application in various fields such as flexible sensing, electrochemistry, and supercapacitors [4,5,6]. Conductive porous materials have their own limitations such as uneven pore size distribution and weak adhesion between the filler and pore structure. The porous materials prepared by pyrolysis [7], polymer solidification [8], or aerogel preparation [9] will produce low porosity and weak adhesion [10,11,12]. The preparation process of porous materials is complex, and their properties may be unstable. Compared with other porous materials, the pore distribution of sponge is uniform and its structure is stable [13]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
