Elessawy Noha A, El Nady J, Wazeer W, Kashyout A B
Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box 21934, Alexandria, Egypt.
Electronic Materials Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box 21934, Alexandria, Egypt.
Sci Rep. 2019 Feb 4;9(1):1129. doi: 10.1038/s41598-018-37369-x.
3D sponge nitrogen doped graphene (NG) was prepared economically from waste polyethylene-terephthalate (PET) bottles mixed with urea at different temperatures using green approach via a novel one-step method. The effect of temperature and the amount of urea on the formation of NG was investigated. Cyclic voltammetry and impedance spectroscopy measurements, revealed that nitrogen fixation, which affects the structure and morphology of prepared materials improve the charge propagation and ion diffusion. The prepared materials show outstanding performance as a supercapacitor electrode material, with the specific capacitance going up to 405 F g at 1 A g. An energy density of 68.1 W h kg and a high maximum power density of 558.5 W kg in 6 M KOH electrolytes were recorded for the optimum sample. The NG samples showed an appropriate cyclic stability with capacitance retention of 87.7% after 5000 cycles at 4 A g with high charge/discharge duration. Thus, the prepared NG herein is considered to be promising, cheap material used in energy storage applications and the method used is cost-effective and environmentally friendly method for mass production of NG in addition to opening up opportunities to process waste materials for a wide range of applications.
采用一种新颖的一步法绿色工艺，在不同温度下将废弃聚对苯二甲酸乙二酯（PET）瓶与尿素混合，经济地制备了3D海绵状氮掺杂石墨烯（NG）。研究了温度和尿素用量对NG形成的影响。循环伏安法和阻抗谱测量表明，影响所制备材料结构和形态的固氮作用改善了电荷传播和离子扩散。所制备的材料作为超级电容器电极材料表现出优异的性能，在1 A g时比电容高达405 F g。对于最佳样品，在6 M KOH电解质中记录到能量密度为68.1 W h kg，最大比功率密度为558.5 W kg。NG样品表现出适当的循环稳定性，在4 A g下循环5000次后电容保持率为87.7%，充放电持续时间长。因此，本文制备的NG被认为是用于储能应用的有前景的廉价材料，所采用的方法具有成本效益且环境友好，可用于大规模生产NG，此外还为将废料加工用于广泛应用开辟了机会。
