کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
197345 | 459882 | 2005 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Capacitance behavior of activated carbon fibers with oxygen-plasma treatment Capacitance behavior of activated carbon fibers with oxygen-plasma treatment](/preview/png/197345.png)
Modified activated carbon fibers (ACFs) were used as the electrodes of an electric double-layer capacitor and showed an enhanced capacitance effect after a RF-plasma treatment. The capacitance and the surface functional groups of the ACFs were studied. For the plasma-treated ACFs having a specific surface area of 1500 m2 g−1, the capacitance increased by 28% compared to the untreated sample and the highest electric capacitance value of 142 F g−1 was achieved with an oxygen feed concentration of 10 vol.%. The Brunauer–Emmett–Teller (BET) surface area was 2103 m2 g−1, which was 34% higher than that of the untreated sample. The pore volume was similarly increased to 483.1 cm3 g−1 STP, and from the pore distribution plot, quantities of mesopores of 10 nm or less and micropores also increased. However, in order to enhance the capacitance, the quinone functional group had a significant influence in addition to the BET surface area. The correlation between the capacitance and the number of quinone functional groups was confirmed because quinone is an electron acceptor.
Journal: Electrochimica Acta - Volume 50, Issue 11, 1 April 2005, Pages 2227–2231