Ji Zhenyuan, Ma Dongwei, Dai Wenyao, Liu Kai, Shen Xiaoping, Zhu Guoxing, Nie Yunjin, Pasang Drolma, 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. 2021 May 15;590:614-621. doi: 10.1016/j.jcis.2021.01.102. Epub 2021 Feb 3.
With the ever-increasing demands for energy resources, the exploration of high energy density hybrid supercapacitors is urgently required. Herein, an effective hydrothermal strategy is demonstrated to construct advanced cathode of nickel carbonate hydroxide (NCH) ultrathin nanosheets anchored nitrogen-doped carbon quantum dots (NCQDs) for hybrid supercapacitors. It is revealed that the NCQDs are evenly deposited on the surface of NCH nanosheets, which provide abundant active sites for NCH nanosheets and endow them improved electrochemical characteristics. The NCH/NCQDs nanosheets deliver a decent electrochemical capacity of 727C g at 1 A g with ameliorative rate capability and cyclic stability. In addition, a hybrid supercapacitor device with an impressive energy density (49.1 Wh kg at 700.3 W kg) and stable cycling property (87.5% after 8000 cycles) is fabricated by employing NCH/NCQDs nanosheets and p-phenylenediamine functionalized reduced graphene oxide (PRGO) as cathode and anode. These results indicate the great potential of NCH/NCQDs nanosheets for renewable energy storage.
随着对能源资源的需求不断增加，迫切需要探索高能量密度混合超级电容器。在此，展示了一种有效的水热策略，用于构建用于混合超级电容器的碳酸氢氧化镍（NCH）超薄纳米片锚定氮掺杂碳量子点（NCQD）的先进阴极。结果表明，NCQD均匀沉积在NCH纳米片表面，为NCH纳米片提供了丰富的活性位点，并赋予其改善的电化学特性。NCH/NCQD纳米片在1 A g下具有727C g的良好电化学容量，同时具有改善的倍率性能和循环稳定性。此外，通过使用NCH/NCQD纳米片和对苯二胺功能化还原氧化石墨烯（PRGO）作为阴极和阳极，制备了具有令人印象深刻的能量密度（在700.3 W kg下为49.1 Wh kg）和稳定循环性能（8000次循环后为87.5%）的混合超级电容器装置。这些结果表明NCH/NCQD纳米片在可再生能源存储方面具有巨大潜力。
