An active carbon/graphene oxide/acid nanocomposite electropolymerized via a thiophene monomer: supercapacitor device performances in a 2032 coin cell

Küçük Resim Yok

Tarih

2024

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Springer Heidelberg

Erişim Hakkı

info:eu-repo/semantics/closedAccess

Özet

High-performance energy storage devices, such as portable electronic devices and electrically powered cars, need high electrochemical performances (energy and power densities). Supercapacitors are high-performance energy storage devices that have high specific capacitances and power densities. A new electrode design is compulsory to reach the target. So, its surface morphology, surface area, pore structures and charge carrier properties can be controlled to obtain a high-performance energy storage devices. In this study, bicyclo (2.2.1)-hept-5-en-2-carboxylic acid was chemically synthesized for use as a dopant in electrode materials. Furthermore, graphene oxide (GO) was synthesized by the modified Hummers method. The functional end groups of GO were activated by the acid dopant. Activated carbon (AC) was used as an electrode component for the biomass material of walnut sheels. AC/GO/acid was formed as a slurry using N-methyl-2-pyrrolidone. This mixture was electropolymerized with a thiophene (Th) monomer on an Au electrode with a 3-electrode system by the CV method. After removing the AC/GO/acid/PTh active materials on the Au electrode (called as C-1; C-2; C-3 with changing of acid content in the nanocomposite), the electrode was fabricated as a symmetrical 2 electrode supercapacitor device. Each component of the active materials was characterized by solid-state conductivity, SEM-EDX, FTIR-ATR, TGA-DTA, and BET analyses. Moreover, the electrochemical performance of supercapacitors, including CR2032 coin cells, was tested by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) methods. The highest specific capacitance was obtained at C-sp = 743.70 F/g at 2 mV/s for AC/GO/PTh nanocomposite (C-4), which does not contain a dopant agent (acid). The highest conductivity was observed as sigma = 2.61 x 10(-5) S/cm in the highest acid content (18%) in the nanocomposite for C-3. The conductivity of C-3 is similar to 13.0 times greater than that of C-4. In addition, long-term stability tests (1000 and 5000 cycles) and equivalent circuit model analysis (Randless circuit, (R-s(CRct))) were carried out with 4 different composite materials for supercapacitor devices.

Açıklama

Anahtar Kelimeler

Nanocomposite, Graphene oxide, Supercapacitor, Bile acid, Active carbon, CR2032 coin cell

Kaynak

Ionics

WoS Q Değeri

N/A

Scopus Q Değeri

Q2

Cilt

30

Sayı

9

Künye