International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Nanoscale. 2018 Jul 9;10(26):12398-12406. doi: 10.1039/c8nr02647e.
Ordered mesoporous nitrogen-doped carbon (OMNC) materials are considered as the most promising material for supercapacitors. In this study, a highly ordered two-dimensional (2D) hexagonal mesostructured polymer was synthesized through a facile assembly of triblock polymer micelles and phenol-melamine/formaldehyde resin via an organic-organic assembly process in aqueous solution. After calcination, the novel OMNC materials with 2D hexagonal mesostructures were obtained. By further KOH activation, the surface area and the porosity of the OMNC significantly improved, and the internal mesoporous structures were maintained. The activated OMNC-800A displayed a specific capacitance as high as 475.75 F g-1 at 0.5 A g-1 with an outstanding cycling stability (over 100% capacitance retention during 2000 cycling tests at 100 mV s-1). These results confirm that the tubular mesochannels inside the OMNC are very beneficial in providing an accessible path for diffusion of the electrolyte, thereby improving the specific capacitance of OMNC at a high current density.
有序介孔氮掺杂碳（OMNC）材料被认为是超级电容器最有前途的材料。在这项研究中，通过在水溶液中通过两亲性嵌段共聚物胶束和酚醛-三聚氰胺/甲醛树脂的有机-有机组装过程，合成了高度有序的二维（2D）六方介孔聚合物。煅烧后，得到具有 2D 六方介孔结构的新型 OMNC 材料。通过进一步的 KOH 活化，OMNC 的比表面积和孔隙率显著提高，同时保持了内部介孔结构。在 0.5 A g-1 的电流密度下，活化后的 OMNC-800A 具有高达 475.75 F g-1 的比电容，并且具有出色的循环稳定性（在 100 mV s-1 的 2000 次循环测试中，电容保持率超过 100%）。这些结果证实，OMNC 内部的管状介孔通道非常有利于电解质的扩散，从而提高了 OMNC 在高电流密度下的比电容。
