Ji Zhenyuan, Liu Kai, Li Na, Zhang Hongyan, Dai Wenyao, Shen Xiaoping, Zhu Guoxing, Kong Lirong, Yuan Aihua
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
J Colloid Interface Sci. 2020 Nov 1;579:282-289. doi: 10.1016/j.jcis.2020.06.070. Epub 2020 Jun 18.
Herein, we demonstrate an advanced cathode of nitrogen-doped carbon dots (NCDs) anchored NiO/CoO ultrathin nanosheets for hybrid supercapacitors by a facile hydrothermal-calcination route. Owing to the well defined thin-plate structure and ternary composition, the optimized NiO/CoO/NCDs nanosheets demonstrate a high specific capacity of 976.3 C g (1775 F g) at 1 A g, and a splendid cycling stability of approximately 95.7% retention over 10,000 continuous cycles (15 A g). In addition, a hybrid supercapacitor is constructed by using NiO/CoO/NCDs nanosheets as cathode and reduced graphene oxide (RGO) supported NCDs composites as anode. The obtained NiO/CoO/NCDs//RGO/NCDs hybrid supercapacitor delivers a maximum energy density of 41.6 Wh kg, together with outstanding cycling stability (no decay after 10,000 cycles at 10 A g). Therefore, the ultrathin sheet-like structured NiO/CoO/NCDs cathode presents a great potential for supercapacitor application.
在此，我们通过简便的水热-煅烧路线展示了一种用于混合超级电容器的先进阴极，该阴极由氮掺杂碳点（NCDs）锚定的NiO/CoO超薄纳米片组成。由于具有明确的薄板结构和三元组成，优化后的NiO/CoO/NCDs纳米片在1 A g下表现出976.3 C g（1775 F g）的高比容量，以及在10,000次连续循环（15 A g）中约95.7%的出色循环稳定性。此外，通过使用NiO/CoO/NCDs纳米片作为阴极和还原氧化石墨烯（RGO）负载的NCDs复合材料作为阳极，构建了一种混合超级电容器。所获得的NiO/CoO/NCDs//RGO/NCDs混合超级电容器具有41.6 Wh kg的最大能量密度，以及出色的循环稳定性（在10 A g下10,000次循环后无衰减）。因此，超薄片状结构的NiO/CoO/NCDs阴极在超级电容器应用中具有巨大潜力。
