Facile fabrication of freestanding three-dimensional composites for supercapacitors

Abstract

A facile and highly efficient method for the fabrication of free-standing three-dimensional (3D) composites with different morphologies was designed by the combination of the electrospinning method and hydrothermal reaction. The controlled hierarchical nanoarrays showed excellent electrochemical performance for their potential use as supercapacitor electrodes.

Influence of Temperature on ZnO/Co3O4 Nanocomposites for High Energy Storage Supercapacitors

“…Anticipating these synergistic effects, various nanocomposites of different TMOs, such as WO 3 /TiO 2, Co 3 S 4 @Co 3 O 4, ZnO–NiO, and ZnCo 2 O 4 @MnCo 2 O 4, have been reported. To design the structures, metal–organic frameworks (MOFs) and TMOs derived from the MOFs are also reported. , In particular, Co 3 O 4 is an attractive hybrid component candidate because of its low cost, natural abundance, environmental friendliness, structures with high surface area, high redox activity, and high theoretical capacitance (approximately 3560 F g –1 ). ,, On the other hand, ZnO is also a promising candidate for supercapacitor applications due to its environmental friendliness, low cost, biocompatibility, high electrical conductivity, and excellent chemical and thermal stabilities. , Moreover, since ZnO is among the best semiconductor materials, its capacitance contribution is less, so the ZnO layer can be used as a powerful mechanical support for redox materials and offers a sufficient pathway for the electron transport of the electrode materials due to its high mechanical flexibility and chemical stability in alkaline and neutral electrolytes. , …”

“…18,19,36 On the other hand, ZnO is also a promising candidate for supercapacitor applications due to its environmental friendliness, low cost, biocompatibility, high electrical conductivity, and excellent chemical and thermal stabilities. 19,37 Moreover, since ZnO is among the best semiconductor materials, its capacitance contribution is less, so the ZnO layer can be used as a powerful mechanical support for redox materials and offers a sufficient pathway for the electron transport of the electrode materials due to its high mechanical flexibility and chemical stability in alkaline and neutral electrolytes. 38,39 For electrode preparation, Co 3 O 4 and its composite materials are mostly provided in powder form and then mixed with other conductive materials and binders to be placed as a slurry on current collectors.…”

Wearable Solid-State Supercapacitors Operating at High Working Voltage with a Flexible Nanocomposite Electrode

“…The formation of the flexible self-sustained carbon film is mainly ascribed to a large sum of macropores generated when PTA turned into gas and came out from the inside the nanofibers during carbonization. 29,30 Here, we clearly show many pores of about 50 nm (lighter areas) from the TEM images (Figures 2e and f) and SEM image (Figure 3a) of the TP-CNF. However, the CNF control in Figure 2g shows no porosity, i.e., no lighter areas.…”

Fabrication of bioinspired super-hydrophilic nano-fibrous membrane for oil-water separation and directional water transportation

“…Moreover, the one-dimensional nanofibers made via electrospinning obtain excellent structural mechanical strength, nanoscale pore size and large specific surface area coupled with remarkable porosity due to the interconnected pore structure. After decades of development, electrospun fibers have been utilized in many areas such as filtration (Liu, Wang et al 2013), tissue engineering (Zhan, Liu et al 2016), electronic and photonic devices (Li, Wang et al 2016) and also sensor technology (Senthamizhan, Celebioglu et al 2014).…”

“…Electrospun nano-fibers with high specific surface areas, nanoscale pore sizes and highly interconnected pore structures have promising application in oil-water separation . Moreover, active nanoscale structures can be induced on the surface of nano-fibers to obtain different properties (Li, Wang et al 2016). Thus, they have the potential to work like the micro-/nano-structured superhydrophilic surfaces using water as lubricating liquid to repel oil.…”