Binder Free and Flexible Asymmetric Supercapacitor Exploiting Mn3O4 and MoS2 Nanoflakes on Carbon Fibers

Abstract

Emerging technologies, such as portable electronics, have had a huge impact on societal norms, such as access to real time information. To perform these tasks, portable electronic devices need more and more accessories for the processing and dispensation of the data, resulting in higher demand for energy and power. To overcome this problem, a low cost high-performing flexible fiber shaped asymmetric supercapacitor was fabricated, exploiting 3D-spinel manganese oxide Mn3O4 as cathode and 2D molybdenum disulfide MoS2 as anode. These asymmetric supercapacitors with stretched operating voltage window of 1.8 V exhibit high specific capacitance and energy density, good rate capability and cyclic stability after 3000 cycles, with a capacitance retention of more than 80%. This device has also shown an excellent bending stability at different bending conditions.

High-Performance Supercapacitor Electrodes Based on Composites of MoS2 Nanosheets, Carbon Nanotubes, and ZIF-8 Metal–Organic Framework Nanoparticles

“…It is worth noting that even at the high scan rate (100 mV/s), nearly half of the charge storage depends on the diffusion-controlled process in our experiment. It has been reported that the CNT- ,, and MoS 2 -based ,,, supercapacitors similar to our samples (but no intermediate ZIF layer) mostly rely on the surface-controlled process at high scan rates (e.g., above a few tens of mV/s). Table summarizes such studies in the literature.…”

“…Figure f shows that the power density increases with the increasing scan rate, while the energy density exhibits the opposite trend. The energy density of our composite electrode is greater than those reported in many other studies adopting CNT, ZIF, and/or MoS 2 as electrode materials. ,,− …”

“…Figure shows that the supercapacitor shows an exceptionally stable charge/discharge behavior with approximately 99% of the initial specific capacitance after 20 000 cycles. It should be noted that such a performance has not been achieved in most carbon-, ,, TMD-, ,, ZIF-based ,,, devices. The difference may be attributed to the stable chemistry between the constituent materials.…”

Facile Construction of Three-Dimensional Architectures of a Nanostructured Polypyrrole on Carbon Nanotube Fibers and Their Effect on Supercapacitor Performance

“…Figure g shows a comparison of the specific capacitance of the supercapacitor in this study and recently reported FSSCs based on carbon-based fiber electrodes. The specific capacitance reported in this work is larger than many previously reported FSSCs, including supercapacitors based on ACF (54.2 at 0.2 A g –1 ), MnO 2 /CNTF (17.1 at 1 A g –1 ), Mn 3 O 4 and MoS 2 /CF (70 at 0.5 A g –1 ), NCHrGO/CF//NQrGO/CF (69.1 at 0.41 A g –1 ), MWCNT/MOF (151.1 at 1 A g –1 ), CF/CNT/MnO 2 //CF/CNT/PPy (59.7 at 0.5 A g –1 ), and FHRCF (122.2 at 1 A g –1 ) …”

Efficient Flexible All-Solid Supercapacitors with Direct Sputter-Grown Needle-Like Mn/MnOx@Graphite-Foil Electrodes and PPC-Embedded Ionic Electrolytes

“…Reduced graphene Oxide (RGO)-mediated synthesis of Mn 3 O 4 electrode for ASC by Gao et al also results in a potential window of 1.6 V [ 25 ]. Rafique et al reported a manganese oxide-based asymmetric supercapacitor displaying stable potential window up to 1.8 V [ 26 ]. Saha et al also fabricated an asymmetric supercapacitor with MnO 2 microfiber electrodes which were synthesized by Rotary-Jet Spin method and obtained a potential window of 1.6 V [ 27 ].…”