A hybrid of MnO2 nanowires and MWCNTs as cathode of excellent rate capability for supercapacitors

A hybrid electrolyte energy storage device with high energy and long life using lithium anode and MnO2 nanoflake cathode

“…The specific capacitance calculated from the CV curves is 232 and 150 F g -1 for scan rates of 1 mV s -1 and 20 mV s -1 , respectively. The data is matched very well with our previous report on the aqueous supercapacitor system [11,24,25].…”

“…For example, supercapacitors based on MnO 2 active materials in aqueous electrolyte can be cycled up to 30,000 cycles with capacity retention higher than 80%, but the energy density is less than 10% of the energy density of LIBs [11].…”

A reduced graphene oxide/Co3O4 composite for supercapacitor electrode

“…Therefore, pseudocapacitors are being developed to improve the energy density of devices since pseudocapacitors store and deliver energy through redox reactions, leading to high specific capacitance [11,12]. Transition metal oxides such as MnO 2 , NiO, Fe 2 O 3 and Co 3 O 4 are being studied as candidate materials for pseudocapacitor electrodes [11][12][13][14][15][16][17][18]. Although metal oxides alone offer high specific capacitance, they deliver low power density and poor rate capability (dramatic drop of specific capacitance with an increase at a high scan rate) due to poor electronic conductivity [19][20][21][22].…”

Controlled growth of nanostructured MnO2 on carbon nanotubes for high-performance electrochemical capacitors

“…In this respect, various A C C E P T E D M A N U S C R I P T carbonaceous supports including activated carbons [32,33], carbon nanotubes (CNTs) [34][35][36][37][38][39][40], carbon nanofibers (CNFs) [41][42][43][44], graphenes [45][46][47][48][49][50][51] and carbon aerogels [52,53], etc. have been employed to integrate with MnO 2 for fabricating hybrid electrode materials.…”