A nanocomposite of needle-like MnO2 nanowires arrays sandwiched between graphene nanosheets for supercapacitors

Nanostructured MnO2 as Electrode Materials for Energy Storage

“…The specific capacitance after the MnO 2 deposition was 328 F·g −1 at a charging current of 1 mA with an energy density of 11.4 Wh·kg −1 [187]. Song et al [188] fabricated a nanocomposite for a supercapacitor composed of needle-like MnO 2 nanowire arrays on graphene synthesized by in-situ growth of MnO 2 nanowires on the surface of graphene nanosheets (GNS). The preparation is a simple redox reaction between KMnO 4 and GNS, which can produce the composite at large scale at low cost.…”

Solvothermal synthesis of graphene–MnO2 nanocomposites and their electrochemical behavior

“…(iii) The 1D MnO 2 nanorods and graphene sheets forming a cross-link sandwiched structure as shown in the FE-SEM images ( Figure 3) can provide more micropores and prevent restacking of graphene thereby improving ϭϰ the adsorption/desorption of ions on the graphene sheet [23]. The resultant specific capacitance of graphene-MnO 2 composites is significantly higher than previous reported on graphene-MnO 2 [18,24,50].…”

Biowaste-Derived Three-Dimensional Porous Network Carbon and Bioseparator for High-Performance Asymmetric Supercapacitor

“…Among electrode materials for pseudocapacitors, MnO 2 has many advantages, such as its low cost, natural abundance, large theoretical capacity (∼1370 F g –1 ), and low toxicity . Moreover, MnO 2 can be used to prepare high-performance composite with carbon materials and other capacitive materials for active electrode materials. − SEM images of MnO 2 /AC-300 and MnO 2 /AC-KOH are shown in Figure a,b, respectively. On the surface of samples, MnO 2 NPs distributed homogeneously.…”