Abstract
Nitrogen doped porous activated carbon was synthesized from coffee waste for flexible supercapacitor applications. Nitrogen of 8.0 at% was doped, and specific capacitance of 139F g−1 at 0.5 A/g with specific energy of 12.5 Wh kg−1 and specific power of 202 W kg−1 was obtained for flexible supercapacitors. Eventually, high specific capacitance retention (90.5 %) as well as high coulombic efficiency (84.5 %) after 5,000 cycles with reliable flexibility were shown. The results demonstrated that the synthesized nitrogen-doped coffee waste derived carbon electrode could be used for the flexible supercapacitor electrodes.
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