Mn_0.5Co_2.5O₄ Nanofibers Intercalated into Graphene Frameworks with Mesoporous Structure for Batteries and Supercapacitors

Abstract

Self‐assembled manganese cobalt oxide (Mn0.5Co2.5O4) nanofibers intercalated into graphene frameworks (Mn0.5Co2.5O4@G) with a mesoporous structure are successfully synthesized by a hydrothermal treatment and annealing process. The unique structure can effectively prevent volume changes of Mn0.5Co2.5O4 nanofibers and graphene layers from restacking, and enhance the electrode kinetics, so the composite demonstrates superior electrochemical performances for lithium‐ion batteries (LIBs) and supercapacitors. As an anode material for LIBs, the Mn0.5Co2.5O4@G composite shows a large reversible specific capacity of 950 mAh g−1 after 100 cycles at a current density of 0.2 A g−1. In a three‐electrode system, it achieves specific capacitances of 1926 F g−1 at a current density of 10 A g−1, and capacitances of 1575 and 1211 F g−1 at ultrahigh current densities of 30 and 40 A g−1, respectively. For an asymmetric supercapacitor, Mn0.5Co2.5O4@G//AC (AC=activated carbon) can achieve high energy densities of 64.9 and 14.6 Wh kg−1 at power densities of 75.2 and 3754.3 W kg−1, respectively.

Synthesis and mechanism of MoS2 and graphene oxide insertion in porous multi metal ion modified MnO2 nanorods for dye degradation

“…In the present study, congo red dye is tested as model compound for catalytic degradation reaction. The Congo red compound has been considered an organic azo dye that causes carcinogenicity and other related detrimental severe effects toward human and aquatic life [9,10]. Hence, the objective of the present study is to develop new additive (MoS 2 ) deposition on Ni-Co MnO 2 is for dye degradation by sono-catalytic method.…”

“…Incorporating various metal ions into the mesoporous matrix enhances its catalytic potential. Metal ion-doped MnO 2 matrices have been utilized for the degradation of volatile organic compounds and the removal of persistent organic pollutants in water [9][10][11][12]. The mentioned composite shows promise for sorption of large dye molecules.…”

Role of Halide Substitution in Perovskite‐Based Asymmetric Hybrid Supercapacitor

“…Therefore, scientists are looking into developing new electrode and electrolyte materials to increase the efficiency and stability of supercapacitors. [14][15][16] Several low-dimensional materials, including carbon, have been tested for EDLC-type supercapacitors application, yet the energy density is not promising. [13,17,18] Recently, hybrid halide perovskites have been used in asymmetric supercapacitors application due to their high ionic conductivity as well as high charge carrier mobility.…”