Kim Keon-Woo, Park Bomi, Kim Jun, Seok Hyunho, Kim Taesung, Jo Changshin, Kim Jin Kon
National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea.
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk 37673, Republic of Korea.
ACS Appl Mater Interfaces. 2023 Dec 20;15(50):57905-57912. doi: 10.1021/acsami.3c02791. Epub 2023 Apr 11.
Ordered mesoporous carbons (OMCs) are promising materials for cathode materials of a Zn ion hybrid capacitor (Zn HC) due to their high surface area and interconnected porous structure. Graphitization of the framework and nitrogen doping have been used to improve the energy storage performance of the OMCs by enhancing electrical conductivity, pseudocapacitive reaction sites, and surface affinity toward aqueous electrolytes. Thus, when both methods are simultaneously implemented to the OMCs, the Zn HC would have improved energy storage performance. Herein, we introduce a facile synthetic method for N-doped mesoporous graphitic carbon (N-mgc) by utilizing polystyrene--poly(2-vinlypyridine) copolymer (PS--P2VP) as both soft-template and carbon/nitrogen sources. Co-assembly of PS--P2VP with Ni precursors for graphitization formed a mesostructured composite, which was converted to N-doped graphitic carbon through catalytic pyrolysis. After selective removal of Ni, N-mgc was prepared. The obtained N-mgc exhibited interconnected mesoporous structure with high nitrogen content and high surface area. When N-mgc was employed as a cathode material in Zn ion HC, excellent energy storage performance was achieved: a high specific capacitance (43 F/g at 0.2 A/g), a high energy density of 19.4 Wh/kg at a power density of 180 W/kg, and reliable cycle stability (>3000 cycles).
有序介孔碳（OMC）因其高比表面积和相互连接的多孔结构，是锌离子混合电容器（Zn HC）阴极材料的理想选择。通过提高电导率、赝电容反应位点以及对水性电解质的表面亲和力，框架石墨化和氮掺杂已被用于改善OMC的储能性能。因此，当这两种方法同时应用于OMC时，Zn HC的储能性能将会得到提升。在此，我们介绍一种简便的合成方法，利用聚苯乙烯-聚（2-乙烯基吡啶）共聚物（PS-P2VP）作为软模板和碳/氮源来制备氮掺杂介孔石墨碳（N-mgc）。PS-P2VP与用于石墨化的镍前驱体共组装形成一种介观结构复合材料，通过催化热解将其转化为氮掺杂石墨碳。选择性去除镍后，制备得到N-mgc。所获得的N-mgc呈现出具有高氮含量和高比表面积的相互连接的介孔结构。当N-mgc用作锌离子混合电容器的阴极材料时，实现了优异的储能性能：在0.2 A/g时具有高比电容（43 F/g），在功率密度为180 W/kg时具有19.4 Wh/kg的高能量密度，以及可靠的循环稳定性（>3000次循环）。
