Reduced graphene oxide-mediated synthesis of Mn₃O₄ nanomaterials for an asymmetric supercapacitor cell

Abstract

The existence presence of rGO can affect the morphology of an Mn3O4/rGO composite, and the asymmetric supercapacitor cell created with this composite exhibits good capacitive performance.

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

“…A series of CV measurements ( Figure 2 a) of this symmetric pouch-cell supercapacitor device were performed by applying different potential windows varying from 0–1.4 to 0–2.4 V at 80 mV/s to estimate the maximum stable operating potential window of this FSC. It is well-known that a higher stable potential window extends the desired output as an alternative to the series combination of devices [ 25 , 38 ]. In this present case, no obvious increase in positive current (anodic current) due to any polarization has been observed even at 2.2 V for this SC, which implies that this SC device can be performed up to a wide stable potential window of 0–2.2 V. Therefore, this potential window (e.g., 0–2.2 V) is chosen for safe and stable results at further electrochemical investigations of the FSC with a polymer gel electrolyte in 1:1 ratio of [EMIM][TFSI]:PPC.…”

“…Recent studies with MnO x report relatively low potential windows: The MnO x /Au-based, all-solid-state microsupercapacitor of Si et al [ 23 ] shows a potential window of only 1.0 V, while Tian et al prepared a carbon fiber paper-supported Co/Ni-layered double hydroxide MnO x electrode by a simple two-step electrochemical deposition process for asymmetric supercapacitor (ASC) application exhibiting a potential window of 1.6 V [ 24 ]. 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 ]. Therefore, it is crucial to design advance flexible binder-free electrodes to improve the stable potential window as well as enhancing the overall conductivity of the active electrode materials [ 19 , 25 , 28 ].…”

“…Recent studies with MnO x report relatively low potential windows: The MnO x /Au-based, all-solid-state microsupercapacitor of Si et al [23] shows a potential window of only 1.0 V, while Tian [27]. Therefore, it is crucial to design advance flexible binder-free electrodes to improve the stable potential window as well as enhancing the overall conductivity of the active electrode materials [19,25,28].…”

Incorporating Ni-MOF structure with polypyrrole: enhanced capacitive behavior as electrode material for supercapacitor

“…With rapid population growth and socio-economic development, environmental problems caused by the use of nonrenewable resources have become more and more serious. Research and development of a new highly efficient and environmentally friendly renewable resource have become important choices for the sustainable development of society, 1,2 which in turn causes the rapid development of energy storage and energy conversion systems, such as supercapacitors, 3 fuel cells, 4 and lithium-ion batteries. 5,6 Conventional batteries possess high energy density and long energy life, but the power density is normally poor.…”