Facile synthesis of MnO2/CNT nanocomposite and its electrochemical performance for supercapacitors

In-situ synthetize multi-walled carbon nanotubes@MnO2 nanoflake core–shell structured materials for supercapacitors

“…Wang and Peng synthesized MnO 2 /CNTs by a facile direct redox reaction between potassium permanganate (KMnO 4 ) and CNTs without any other oxidant or reductant addition. The composite kept 90% of its SC after 2000 cycles at the current density of 5 A g À1 [21]. Similar approach was also demonstrated by Ma and his co-workers.…”

“…The initial MWCNTs were activated by stirring in 65 wt% nitric acid at 25 C for 24 h [21]. After stirring, the activated-MWCNTs (a- MWCNTs) were obtained by rinsing with deionized water and drying in the air at 100 C. The typical synthesis process of the MWCNTs@MnO 2 composite can be described as follows.…”

Manganese-Containing Supercapacitors for Future Energy Storage

“…In 1 M Na 2 SO 4 aqueous electrolyte (pH=9) at room temperature, it shows 33 Wh kg -1 energy density at 1000 W kg -1 power density [14]. Carbon nanotubes (CNT) also met nice use, Jian Yang got MnO 2 and CNT nanocomposite, which reaches 162.2 F g −1 at the current density of 0.2 A g −1 with excellent cycling stability with 90% of its specific capacitance left after 2000 cycles [15]. Junlei Qifabricated vertically standing graphene-MnO 2 nanoparticle hybrids as electrode materials, exhibits a high specific capacitance of 1176 F g -1 at 2 mV s -1 , and a long cycling lifetime with negligible capacitance loss after 10000 cycles.…”

Fabrication and Microhardness Analysis of MWCNT/MnO2Nanocomposite

“…MnO 2 /CNT nanocomposite was successfully synthesized by soft template method and the products had poor crystalline characteristics, and the adjacent nanorods were fused to each other irregularly to form spherical-like agglomerations and MnO 2 nanorods were absorbed on CNTs in the CNT/MnO 2 composite [7]. MWCNT/MnO 2 composite with different contents of birnessite-type MnO 2 coated on carbon nanotubes through a facile, simple, and green method of the redox reaction between KMnO 4 and carbon nanotubes without any other oxidant or reductant addition [8]. Using a simple hydrothermal treatment, MWCNT/MnO 2 nanocomposite with a unique nanoarchitecture was successfully synthesized [9].…”