Studies on the performances of silica aerogel electrodes for the application of supercapacitor

Abstract

Silica aerogel (SiO 2 aerogel) was prepared by solgel method from tetraethyl orthosilicate hydrolyzation and has been characterized by scanning electron microscopy and N 2 adsorption for its surface structure, surface area, and poresize distribution. Constant current charge-discharge technique, cyclic voltammetry, and electrochemical impedance spectrum were employed for its specific capacitance and equivalent series resistance. The results showed that the maximum specific capacitance of SiO 2 aerogel electrode in 1 M Et 4 NBF 4 /PC electrolyte was 62.5 F g −1 . In addition, the SiO 2 aerogel capacitor exhibits excellent long-term stability with no significant degradation after 500 charging and discharging cycles. Therefore, the application of high surface area SiO 2 aerogel as electrodes in supercapacitor devices is promising.

Effect of reduced graphene oxide–silica composite in polyaniline: electrode material for high-performance supercapacitor

“…Incorporation of silica into graphene will increase the hydrophilicity of the reduced graphene oxide-silica composite and facilitate the contact of electrode material with the electrolyte, thus, representing an opportunity for the design of materials with improved performance [4], besides increasing the surface area of the materials [5,6]. So, the incorporation of silica modified reduced graphene oxide in polyaniline is expected to offer better properties viz., mechanical strength, permeability, thermal stability [7], and supercapacitor performance [5,8].…”

Silica Aerogel: Synthesis, Characterization, Applications, and Recent Advancements

“…[83] Supercapacitors based on SiO 2 aerogel, manufactured by the sol-gel technique, were explored for the first time by Du et al Because of their mesoporous structure and large surface area, the SiO 2 aerogels investigated in this article were selected for further investigation. [84] According to Korkmaz and Kariper, increasing the roughness and surface area of electrodes increases the stored charge in supercapacitors. In contrast to aerogel graphene oxide, reduced graphene oxide may be made by chemists more readily and cost-effectively.…”

A perspective on graphene based aerogels and their environmental applications

“…Wang et al have incorporated alumina-silica ceramic fibers (A1 3 O 2 : 43-45 %; SiO 2 : 49-52 %; Fe 2 O 3 : 0.5-0.8 %) and TiO 2 particles (30 % TiO 2 + 3 wt% ceramic fibers) in the silica aerogel matrix, and the resulting material reached a thermal conductivity of 38 mWm -1 K − 1 at 800 K, while that value for a conventional insulating material, such as an alumina-fused brick, is around 100 mWm -1 K − 1 [39]. Moreover, the low dielectric constant makes silica aerogels excellent dielectrics in supercapacitors [40]. On the other hand, the structure of silica aerogels composed by cross-linking nanoparticles and weak connections is rigid and brittle, and their mechanical strength still is not adequate for them to resist and remain monolithic in some practical applications.…”