One-step production of O-N-S co-doped three-dimensional hierarchical porous carbons for high-performance supercapacitors
One-step production of O-N-S co-doped three-dimensional hierarchical porous carbons for high-performance supercapacitors
复制标题
DOI：
10.1016/j.nanoen.2018.03.016
复制
发表时间：
2018-05
期刊：
影响因子：
17.6
通讯作者：
Gongyuan Zhao;Chong Chen;Dengfeng Yu;Lei Sun;Chenhui Yang;Hong Zhang;Ye Sun;F. Besenbacher
中科院分区：
文献类型：
--
作者：
Gongyuan Zhao;Chong Chen;Dengfeng Yu;Lei Sun;Chenhui Yang;Hong Zhang;Ye Sun;F. Besenbacher
除了复杂和低产率的合成之外，在保持高功率密度的同时获得高能量密度仍然是超级电容器应用的主要挑战。本文报道了以蚂蚁粉为原料一步合成O-N-S共掺杂分级多孔炭的方法。所得产物具有大的比表面积（2650 m2 g-1），典型的三维（3-D）骨架，其由具有合适孔径分布的互连的大孔、中孔和微孔组成，以及O、N和S的适当杂原子掺杂。这些独特的特性使其在三电极系统中在1.0 A g− 1的电流密度下具有576 F g− 1的超高比电容，在两电极系统中在0.1 A g− 1的电流密度下具有352 F g− 1的超高比电容，使用6 mol L− 1 KOH水溶液作为电解质。此外，从1.0 A g− 1到10.0 A g− 1的高倍率保持率为80%和高循环稳定性（超过10，000次循环的损耗为5%）也已得到证实。最重要的是，使用1-乙基-3-甲基咪唑四氟硼酸盐（EMIMBF 4）电解质制造的对称超级电容器在900 W kg−1的功率密度下提供高达107 Wh kg− 1的能量密度，并且即使在高达18，000 W kg−1的功率密度下也可以保持67 Wh kg− 1的显著能量密度。这些值代表了基于生物质衍生碳的超级电容器的新性能记录，表明这些HPC对于高性能电化学能量存储的巨大前景。
Besides the complex and low-yield synthesis, attaining high energy density whilst maintaining high power density remains as the major challenge for supercapacitor applications. Herein, we report one-step production of O-N-S co-doped hierarchical porous carbons (HPCs) from ant powder. The resultant product possesses a large specific surface area (2650 m2g−1), a typical three-dimensional (3-D) framework comprised of interconnected macro-, meso- and micropores with suitable pore size distribution, together with an appropriate heteroatom doping of O, N, and S. These distinct features have afforded an ultra-high specific capacitance of 576 F g−1at a current density of 1.0 A g−1in a three-electrode system and 352 F g−1at a current density of 0.1 A g−1in a two-electrode system, using 6 mol L−1KOH aqueous as electrolyte. Moreover, the high rate retention of ∼80% from 1.0 A g−1to 10.0 A g−1and the high cycling stability (∼ 5% loss over 10,000 cycles) have been also demonstrated. Most importantly, the fabricated symmetric supercapacitors using 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4) electrolyte delivered an energy density as high as 107 Wh kg−1at a power density of 900 W kg−1, and a remarkable energy density of 67 Wh kg−1can be retained even at a power density as high as 18,000 W kg−1. These values represent a new performance record for supercapacitors based on biomass-derived carbons, indicating the great promise of these HPCs for high-performance electrochemical energy storage.