Kim Keon-Woo, Kim Jun, Choi Chungryong, Yoon Hyeong Keon, Go Myeong Cheol, Lee Jaeyong, Kim Jin Kon, Seok Hyunho, Kim Taesung, Wu Kaibin, Kim Se Hyun, Kim Yong Min, Kwon Jin Han, Moon Hong Chul
National Creative Research Initiative Center for Hybrid Nano Materials By High-level Architectural Design of Block Copolymer Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk790-784, Republic of Korea.
Department of Polymer Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk39177, Republic of Korea.
ACS Appl Mater Interfaces. 2022 Oct 19;14(41):46994-47002. doi: 10.1021/acsami.2c12948. Epub 2022 Oct 6.
Graphene is a promising active material for electric double layer supercapacitors (EDLCs) due to its high electric conductivity and lightweight nature. However, for practical uses as a power source of electronic devices, a porous structure is advantageous to maximize specific energy density. Here, we propose a facile fabrication approach of mesoporous graphene (-G), in which self-assembled mesoporous structures of poly(styrene)--poly(2-vinylpyridine) copolymer (PS--P2VP) are exploited as both mesostructured catalytic template and a carbon source. Notably, the mesostructured catalytic template is sufficient to act as a rigid support without structural collapse, while PS--P2VP converts to graphene, generating -G with a pore diameter of ca. 3.5 nm and high specific surface area of 186 m/g. When the EDLCs were prepared using the obtained -G and ionic liquids, excellent electrochemical behaviors were achieved even at high operation voltages (0 ∼ 3.5 V), including a large specific capacitance (130.2 F/g at 0.2 A/g), high-energy density of 55.4 W h/kg at power density of 350 W/kg, and excellent cycle stability (>10,000 cycles). This study demonstrates that -G is a promising material for high-performance energy storage devices.
由于具有高电导率和轻质特性，石墨烯是一种很有前景的用于双电层超级电容器（EDLC）的活性材料。然而，对于作为电子设备的电源的实际应用而言，多孔结构有利于使比能量密度最大化。在此，我们提出一种制备介孔石墨烯（-G）的简便方法，其中聚（苯乙烯）-聚（2-乙烯基吡啶）共聚物（PS-P2VP）的自组装介孔结构被用作介孔结构催化模板和碳源。值得注意的是，介孔结构催化模板足以作为刚性支撑而不发生结构坍塌，而PS-P2VP转化为石墨烯，生成孔径约为3.5 nm且比表面积为186 m²/g的-G。当使用所制备的-G和离子液体制备EDLC时，即使在高工作电压（0至3.5 V）下也能实现优异的电化学性能，包括大的比电容（在0.2 A/g时为130.2 F/g）、在功率密度为350 W/kg时55.4 W h/kg的高能量密度以及优异的循环稳定性（>10,000次循环）。这项研究表明-G是一种用于高性能储能器件的有前景的材料。
