Electrochemically induced deposition method to prepare γ-MnO2/multi-walled carbon nanotube composites as electrode material in supercapacitors

In-situ hydrothermal synthesis of three-dimensional MnO2–CNT nanocomposites and their electrochemical properties

“…It is well known that the power characteristics of an electrode material strongly depend on the electrochemical kinetics of the redox reaction. Since the capaci- tive current response of the electrodes is mainly contributed by the redox reaction of MnO 2 , it can be presumed that the 3-D network structure of the HE electrode can significantly facilitate the penetration of protons or other cations into the whole electrode matrix [21,29,41]. The specific capacitance (C s , F g −1 ) of the electrode was calculated from the CVs according to the following equation [42]:…”

“…Nevertheless, a major drawback of MnO 2 is its poor electrical conductivity, which limits its power-delivery capability. An effective approach to overcome this disadvantage is the introduction of electronically conductive materials, such as graphite [8], carbon nanofibers [9] and CNTs [3,[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Among them, CNTs have been intensively investigated for their excellent conductivity, large intrinsic area, and chemical stability.…”

Optimization of MnO2/vertically aligned carbon nanotube composite for supercapacitor application

“…Among them, manganese dioxide exhibits promising electrochemical properties, has a lower cost and is considered environmentally friendlier than other metal transition oxides. The combination of CNTs and MnO 2 has already been reported for its use as supercapacitors [11,12,[15][16][17][18][19][20][21][22][23][24][25]. However, almost all these reports deal with misaligned and disordered CNTs and do not optimize their morphology.…”

Manganese oxide nanoflakes/multi-walled carbon nanotubes/chitosan nanocomposite modified glassy carbon electrode as a novel electrochemical sensor for chromium (III) detection

“…The preparation of CNTs-based nanocomposites by modification of CNTs with metals or meta oxides will lead to new composite materials possessing the properties of each component or their synergistic effects, which would be useful in electroanalysis, electrocatalysis and supercapacitors [41-45]. Some nanocomposites containing MnOx and CNTs prepared by A C C E P T E D M A N U S C R I P T 5 mechanical mixing, chemical and mechanical deposition [46]. Since, CNTs are not easy to be dispersed and difficult to form a uniform mixture with metal oxide particles, lack of stability and poorsolubility of CNTs and homogeneity of MnOx/CNTs directly immobilized on the electrode can be a problem [47], so, it is necessary to find a new method to make an uniformly MnOx/CNTs nanocomposite.…”

“…mechanical mixing, chemical and mechanical deposition [46]. Since, CNTs are not easy to be dispersed and difficult to form a uniform mixture with metal oxide particles, lack of stability and poorsolubility of CNTs and homogeneity of MnOx/CNTs directly immobilized on the electrode can be a problem [47], so, it is necessary to find a new method to make an uniformly MnOx/CNTs nanocomposite.…”