Liu Bingqiu, Zhang Qi, Wang Zhao, Li Lu, Jin Zhanshuang, Wang Chungang, Zhang Lingyu, Chen Lihua, Su Zhongmin
Department of Chemistry , Northeast Normal University , Changchun , Jilin 130024 , P. R. China.
Shandong Key Laboratory of Biochemical Analysis; College of Chemistry and Molecular Engineering , Qingdao University of Science and Technology , Qingdao 266042 , PR China.
ACS Appl Mater Interfaces. 2020 Feb 19;12(7):8225-8232. doi: 10.1021/acsami.9b20473. Epub 2020 Feb 5.
The carbon nanostructure with heteroatom doping having well-designed porosity and a large pore volume plays a vital role in high-performance supercapacitors. Herein, we synthesize hierarchical nitrogen and sulfur-codoped micromesoporous carbon nanospheres (N,S-HPCNSs) with an ultralarge pore volume of 3.684 cm g. The ultralarge pore volume in the N,S-HPCNSs can achieve fast charge storage and high electrochemical utilization due to the rapid mass transport. As a result, N,S-HPCNSs exhibit specific capacitances of 309.4 F g at 0.5 A g and 232.0 F g at 50 A g in a 1 M HSO electrolyte, suggesting a superior rate property. Moreover, the N,S-HPCNSs exhibit a splendid cycling performance after 10,000 cycles with 98.5% capacitance retention. Furthermore, a symmetric supercapacitor reaches an excellent energy density of 27.8 W h kg under 180.0 W kg in a 1 M NaSO electrolyte. The remarkable electrochemical properties of N,S-HPCNSs are caused by the ultralarge pore volume and hierarchical micromesoporous structures of the carbon NSs, which provide a significant way for designing energy storage systems.
具有精心设计的孔隙率和大孔体积的杂原子掺杂碳纳米结构在高性能超级电容器中起着至关重要的作用。在此，我们合成了具有3.684 cm³ g超大型孔体积的分级氮硫共掺杂微介孔碳纳米球（N,S-HPCNSs）。由于快速的质量传输，N,S-HPCNSs中的超大型孔体积可以实现快速电荷存储和高电化学利用率。结果，在1 M H₂SO₄电解质中，N,S-HPCNSs在0.5 A g时的比电容为309.4 F g，在50 A g时为232.0 F g，表明其具有优异的倍率性能。此外，N,S-HPCNSs在10000次循环后表现出出色的循环性能，电容保持率为98.5%。此外，在1 M Na₂SO₄电解质中，一个对称超级电容器在180.0 W kg下达到了27.8 W h kg的优异能量密度。N,S-HPCNSs卓越的电化学性能是由碳纳米球的超大型孔体积和分级微介孔结构引起的，这为设计储能系统提供了一条重要途径。
