Characterization of carbon pastes as matrices in composite electrodes for use in electrochemical capacitors
Journal Title: Carbon - Science and Technology - Year 2008, Vol 1, Issue 1
Abstract
Carbon paste electrodes (CPEs) were prepared from carbon black powder with different binders (Silicon Oil or Nujol). Cyclic voltammetry, chronoamperometry and chronopotentiometry techniques and different electrolytes (1M HClO4 and 1M LiClO4) were used to characterize the capacitive response and evaluate the capacitance (F/cm2, F/g) of CPEs, with and without surface modification. The surface modification was carried out by applying a potential pulse (1.35 V vs. saturated calomel electrode, SCE) at a time of 300 s, where the growth of carbon-oxygen (C-O) species were induced on the surface of the electrode. The results show that modified electrodes enhanced the capacitance and the electrolytic system has an important influence in the stability and reactivity of electrodes. The modified electrodes shows an important pseudocapacitive behavior as result of a diffusion processes that involved an interfacial reaction between the C-O species formed during the electrochemical surface treatment and the protons present in the electrolyte.
Authors and Affiliations
O. Martinez-Alvarez, M. Miranda-Hernandez
Keywords
Related Articles
- EP ID EP45928
- DOI -
- Views 334
- Downloads 0
Dry fermentation technology for utilization of Bio-energy crops/crop residues for biogas production
Indian state Punjab produces 160 lakh tones of paddy every year. More than this quantity of paddy, straw is also produced which is not properly utilized. Paddy is burnt in the farmer’s fields itself, which produces lot o...
Thermo-physical properties measurment of water based Fe3O4 nanofluids
Two-step method was used to prepare nanofluids in which nanoparticles were first prepared and then dispersed in basefluid. This paper presents the effect of different volume fractions of magnetic Fe3O4 on thermal conduct...
Oxygen reduction activity of carbon fibers cathode, and application for current generation from the NAD+ and NADH recycling reaction
Carbon fibers treated at 700 oC for 10 min. were found to have O2 reduction activity when being used as a cathode. The special type of partition combined with both cationic and anionic exchange membranes was applied betw...
Semiconducting, Magnetic or Superconducting Nanoparticles encapsulated in Carbon Shells by RAPET method.
An efficient, solvent-free, environmentally friendly, RAPET (Reactions under Autogenic Pressure at Elevated Temperature) synthetic approach is discussed for the fabrication of core-shell nanostructures. The semiconductin...
Pyrolytic carbon film deposit as an electrochemical interface
A pyrolytic carbon (PC) film was grown on planar substrate (graphite rods) by chemical vapor deposition from gaseous feed of methane using a vertical hot-wall deposition reactor. Scanning electron microscopy was used to...