Improvement of electrochemical double-layer capacitance by fast and clean oxygen plasma treatment on activated carbon as the electrode material from walnut shells

被引：41

作者：

Saka, Cafer ^{[1
]}

Baytar, Orhan ^{[2
]}

Yardim, Yavuz ^{[3
]}

Sahin, Omer ^{[2
]}

机构：

[1] Siirt Univ, Fac Hlth Sci, Siirt, Turkey

[2] Siirt Univ, Fac Engn, Siirt, Turkey

[3] Van Yuzuncu Yil Univ, Dept Analyt Chem, Fac Pharm, TR-65080 Van, Turkey

来源：

BIOMASS & BIOENERGY | 2020年 / 143卷

关键词：

Electric double-layer capacitors; Plasma; Walnut shells; Activated carbon; HIERARCHICAL POROUS CARBON; SURFACE FUNCTIONAL-GROUPS; PORE STRUCTURE; ENERGY-STORAGE; NANOTUBES; REMOVAL; COMPOSITES; NANOSHEETS; CHEMISTRY; BEHAVIOR;

D O I：

10.1016/j.biombioe.2020.105848

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

In this study, a simple, fast, and clean oxygen plasma method is presented to increase the surface area of activated carbon from walnut shells (WAC) and to connect functional groups containing oxygen to the carbon sample surface. X-ray photoelectron spectroscopy (XPS), nitrogen adsorption technique, Fourier-transform infrared spectroscopy (FTIR), X-Ray Diffraction (XRD), and scanning electron microscope (SEM) analyses to investigate the properties of the WAC and WACP are performed. Cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) measurements are used to investigate the capacitance properties of the supercapacitors. A significant increase in the surface area of the WAC was increased from 22 m(2) g(-1) to 78 m2 g(-1) after oxygen plasma treatment. The specific capacitance was improved from 6.98 F g(-1) to 76.89 F g(-1) at 2.5 mV s(-1). The devices with functionalized electrodes exhibited cyclic stability of 78% after 5000 cycles.

引用

页数：10