Tang Jing, Wang Tao, Salunkhe Rahul R, Alshehri Saad M, Malgras Victor, Yamauchi Yusuke
World Premier International (WPI) Research Center for Materials, Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan).
Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555 (Japan).
Chemistry. 2015 Nov 23;21(48):17293-8. doi: 10.1002/chem.201503590. Epub 2015 Oct 14.
A facile and sustainable procedure for the synthesis of nitrogen-doped hierarchical porous carbons with a three-dimensional interconnected framework (NHPC-3D) was developed. The strategy, based on a colloidal crystal-templating method, utilizes nitrogenous dopamine as the precursor due to its unique properties, including self-polymerization under mild alkaline conditions, coating onto various surfaces, a high carbonization yield, and well-preserved nitrogen doping after heat treatment. The obtained NHPC-3D possesses a high surface area of 1056 m(2) g(-1) , a large pore volume of 2.56 cm(3) g(-1) , and a high nitrogen content of 8.2 wt %. The NHPC-3D is implemented as the electrode material of a supercapacitor and exhibits a specific capacitance as high as 252 F g(-1) at a current density of 2 A g(-1) . The device also shows a high capacitance retention of 75.7 % at a higher current density of 20 A g(-1) in aqueous electrolyte due to a sufficient surface area for charge accommodation, reversible pseudocapacitance, and minimized ion-transport resistance, as a result of the advantageous interconnected hierarchical porous texture. These results showcase NHPC-3D as a promising candidate for electrode materials in supercapacitors.
开发了一种简便且可持续的方法来合成具有三维互连框架的氮掺杂分级多孔碳（NHPC-3D）。该策略基于胶体晶体模板法，利用含氮多巴胺作为前驱体，这是由于其独特的性质，包括在温和碱性条件下的自聚合、在各种表面上的包覆、高碳化产率以及热处理后良好保留的氮掺杂。所获得的NHPC-3D具有1056 m² g⁻¹的高比表面积、2.56 cm³ g⁻¹的大孔体积以及8.2 wt%的高氮含量。NHPC-3D被用作超级电容器的电极材料，在2 A g⁻¹的电流密度下表现出高达252 F g⁻¹的比电容。由于具有有利的互连分级多孔结构，该器件在水性电解质中于20 A g⁻¹的较高电流密度下也显示出75.7%的高电容保持率，这归因于有足够的表面积用于电荷容纳、可逆的赝电容以及最小化的离子传输电阻。这些结果表明NHPC-3D是超级电容器电极材料的一个有前途的候选者。
