Kale Sayali B, Mahadadalkar Manjiri A, Kim Chang Hyo, Kim Yoong Ahm, Jayswal Manish S, Yang Kap Seung, Kale Bharat B
Technology Department, Savitribai Phule Pune University Pune 411008 India.
Centre for Materials for Electronics Technology (C-MET), Ministry of Electronics and Information Technology, Govt. of India Panchwati Pune-411008 India
RSC Adv. 2019 Nov 5;9(62):36075-36081. doi: 10.1039/c9ra05780c. eCollection 2019 Nov 4.
Nitrogen enriched carbon nanofibers have been obtained by one-step carbonization/activation of PAN-based nanofibers with various concentrations of melamine at 800 °C under a N atmosphere. As synthesised carbon nanofibers were directly used as electrodes for symmetric supercapacitors. The obtained PAN-MEL fibers with 5% melamine stabilised at 280 °C and carbonized at 800 °C under a nitrogen atmosphere showed excellent electrochemical performance with a specific capacitance of up to 166 F g at a current density of 1A g using 6 M KOH electrolyte and a capacity retention of 109.7% after 3000 cycles. It shows a 48% increase as compared to pristine carbon nanofibers. Two electrode systems of the CNFM5 sample showed high energy densities of 23.72 to 12.50 W h kg at power densities from 400 to 30 000 W kg. When used as an anode for Li-ion battery application the CNFM5 sample showed a high specific capacity up to 435.47 mA h g at 20 mA g, good rate capacity and excellent cycling performance (365 mA h g specific capacity even after 200 cycles at 100 mA g). The specific capacity obtained for these nitrogen enriched carbon nanofibers is higher than that for pristine carbon nano-fibers.
通过在氮气气氛下于800℃对不同浓度三聚氰胺的聚丙烯腈基纳米纤维进行一步碳化/活化，制备出了富氮碳纳米纤维。合成的碳纳米纤维直接用作对称超级电容器的电极。在氮气气氛下，含5%三聚氰胺的聚丙烯腈-三聚氰胺纤维于280℃稳定化处理并在800℃碳化，使用6 M氢氧化钾电解质时，在1 A g的电流密度下表现出优异的电化学性能，比电容高达166 F g，3000次循环后容量保持率为109.7%。与原始碳纳米纤维相比，其容量增加了48%。CNFM5样品的双电极系统在400至30000 W kg的功率密度下显示出23.72至12.50 W h kg的高能量密度。当用作锂离子电池的阳极时，CNFM5样品在20 mA g下显示出高达435.47 mA h g的高比容量、良好的倍率性能和优异的循环性能（即使在100 mA g下循环200次后比容量仍为365 mA h g）。这些富氮碳纳米纤维获得的比容量高于原始碳纳米纤维。
