Ag@Activated Carbon Felt Composite as Electrode for Supercapacitors and a Study of Three Different Aqueous Electrolytes

Abstract

The main challenge for the development of a high efficiency supercapacitor is the electrode material. Developing electrode materials with high specific electrical capacitance and low electrical resistance enables an increase in the energy accumulated in the device. In addition, it is expected that the electrode material presents a simple procedure for preparation having low production cost and being environmentally friendly. This work is based on the deposition of silver nanoparticles on activated carbon felt (Ag@ACF) as a supercapacitor electrode. The samples were characterized by field emission gun scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and textural analysis. Supercapacitor behavior was evaluated by galvanostatic charge-discharge curves, cyclic voltammetry and electrochemical impedance spectroscopy using a symmetrical two-electrode Swagelok type cell, and three different aqueous solution electrolytes: 2 M H 2 SO 4 , 6 M KOH and 1 M Na 2 SO 4. Ag@ACF presented a high specific capacitance in KOH, about 170 F g-1 , which makes it an interesting material for supercapacitor electrodes and it showed good specific electrical capacitance, low resistance and high cyclability.

Process of converting human hair into hollow carbon filament for electrochemical capacitor

“…Current density J (measured in Ampere/gram) is related to the number of charges stored in reversible charge/discharge processes. The shape of the (rectangular) curve is related to non-faradaic processes and the more rectangular the closer to an ideal capacitor [23].…”

Synthesis and Characterization of Sucrose and Ammonium Dihydrogen Phosphate (SADP) Adhesive for Plywood

“…Results from this analysis are shown in Figure 9. Regarding the de-convoluted C 1s peak (Figure 9a), binding energy (BE) at 284.7 eV is believed to be derived from both C-C and C-H bonds, two covalent linkages that clearly serve as the dominate bond within the insoluble cured polymer [37]. The signal at 286.2 eV reveals the existence of a C-OH, C-N, or C=N bond [38][39][40].…”

Electrochemical Properties of Iron Oxide Decorated Activated Carbon Cloth as a Binder-Free Flexible Electrode

“…Besides, grafted transitional metal oxides are widely used with carbon, providing great electrochemical performances 12,28,29 through a redox contribution to the total capacitance, usually called pseudocapacitance 30 . This faradaic contribution to the energy storage might be easily obtained with the addition of metallic oxides, such as Zn, Co, Ti, Fe, Ag, and Mn [31][32][33] in the carbon matrix. Among these, iron oxides have advantages such as low cost, environmental friendliness, abundant availability, and non-toxicity 34 .…”