کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5435360 | 1509347 | 2017 | 9 صفحه PDF | دانلود رایگان |
- 2,3,5,6-tetrachloro-1,4-benzoquinone (TCBQ) as an electrode material is studied for supercapacitors.
- Addition of this quinolic substance to activated carbon showed a capacitance of 236Â FÂ gâ1.
- TCNQ/AC carbon electrode showed excellent supercapacitor performance.
Carbon materials have enjoyed wide applications in supercapacitors because of their high surface area which guarantees a high power output through the formation of an electric double layer (EDL). However the energy stored by this EDL mechanism is often insufficient and as such there is the need to upgrade them for higher energy applications. Quinone materials are attracting interest because of their pseudocapacitance contributions which help to boost the energy density of supercapacitors. In this study, composite supercapacitor electrodes are prepared by mechanically mixing 2,3,5,6-tetrachloro-1,4-benzoquinone (TCBQ) and activated carbon. An investigation of 5% w/w and 10% w/w of this quinolic material as a pseudocapacitance material to activated carbon in 1Â M HCl aqueous electrolyte delivers a specific capacitance of 236Â FÂ gâ1 and 240Â FÂ gâ1 comparable to 190Â FÂ gâ1 of just activated carbon over a potential range of â0.3Â V-0.9Â V vs Ag+/Ag. Contrary to what is commonly observed, this material is highly insoluble in the electrolyte medium and remains stable with cycling, recovering 99.57% (for 10% w/w addition) and 99.13% (for 5% w/w addition) of its initial capacitance after cycling at 500Â mVÂ sâ1 scan rate. The findings in this report potentially provides a cheaper yet efficient route to boost the energy density of activated carbon using TCBQ for high energy supercapacitor applications.
Journal: Synthetic Metals - Volume 231, September 2017, Pages 25-33