Manganese dioxide nanofibers with length ranged from 0.1 to 1 μm and a diameter of about 4-6 nm were prepared by a chemical precipitation method. Composite electrodes for electrochemical supercapacitors were fabricated by impregnation of the manganese dioxide nanofibers and multiwalled carbon nanotubes (MWCNT) into porous Ni plaque current collectors. Obtained composite electrodes, containing 8...

In this paper we study the transient behaviour of RC circuits with supercapacitors, varying R between 1 and 100 . We demonstrate that supercapacitors behave as ideal capacitors in series with an internal resistance (r ∼ 8 for C = 0.2 F, 5.5 V). This result is important to optimize the demonstration of RC circuits using a supercapacitor in series with a light bulb, because the r value is compara...

A mixed ionic-electronic conductor based on nanofibrillated cellulose composited with poly(3,4-ethylene-dioxythio-phene):-poly(styrene-sulfonate) along with high boiling point solvents is demonstrated in bulky electrochemical devices. The high electronic and ionic conductivities of the resulting nanopaper are exploited in devices which exhibit record values for the charge storage capacitance (1...

In this critical review, binders for electrochemical supercapacitors are introduced and current technologies on the preparation of binders are reviewed in detail. Different types of materials for binder preparation are reviewed by comparing their advantages, disadvantages, and performance with active materials in ES electrodes. Several new trends for the future development of binder preparation...

We present the design and development of hybrid organic – inorganic materials with improved electrochemical performance to be used in energy storage applications (e.g. supercapacitors). The systematic study carried out shows various carbon–based materials (e.g. activated carbons, graphene based materials) working as active substrates where the anchoring of inorganic species takes place (i.e. po...

Wearable electronics offer the combined advantages of both electronics and fabrics. In this article, we report the fabrication of wearable supercapacitors using cotton fabric as an essential component. Carbon nanotubes are conformally coated onto the cotton fibers, leading to a highly electrically conductive interconnecting network. The porous carbon nanotube coating functions as both active ma...

Supercapacitors, with the merits of both capacitors for safe and fast charge batteries high energy storage have drawn tremendous attention. Recently, laser scribed graphene has been increasingly studied supercapacitor applications due to its unique properties, such as flexible fabrication, large surface area electrical conductivity. With direct writing process, can be directly fabricated patter...