کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5431961 | 1508825 | 2017 | 9 صفحه PDF | دانلود رایگان |
Heteroatom-doped porous carbons have currently been regarded as the promising materials for supercapacitors because of their outstanding contributions in Faradaic capacitance and electrolyte accessibility. In the present study, O/N co-doped porous carbons have been prepared by carbonization of ammonium citrate single precursor followed by KOH activation. The as-synthesized carbon (ACA-800) has a finely-layered schistose architecture together with a high surface O and N-containing functionalities (6.82Â at.% O and 1.37Â at.% N), a high micropore surface area (1522Â m2Â gâ1) and a balanced mesopore surface area (1138Â m2Â gâ1). Due to their synergistic effects, the ACA-800 electrode displays high-rate capacitive performance with specific capacitance of 297Â FÂ gâ1Â at 100Â AÂ gâ1, at least 85% of its capacitance (349Â FÂ gâ1) at 1Â AÂ gâ1. Moreover, symmetric supercapacitor assembled with such ACA-800 exhibits high energy density of 25.5Â WÂ h kgâ1Â at 923Â WÂ kgâ1 as well as excellent cycling stability (only 4% of capacitance loss after 10000 cycles with a cell voltage of 1.8Â VÂ at a current load of 2Â AÂ gâ1). Considering the global abundance and low price of ammonium citrate, it can serve as a novel precursor for the mass production of O/N-enriched porous carbons for advanced supercapacitors.
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Journal: Carbon - Volume 122, October 2017, Pages 538-546