Cho Sanghyun, Jung Insub, Zhang Liqiu, Yoo Sungjae, Won Ji Hye, Jung Sang Baek, Liu Lichun, Park Sungho
Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Republic of Korea. Center for Computational Science Korea Institute of Science and Technology 02792 Seoul, Republic of Korea.
Nanotechnology. 2019 Oct 18;30(42):425401. doi: 10.1088/1361-6528/ab31e5. Epub 2019 Jul 13.
In this work, we demonstrate the synthesis of edge-rich vertical multilayer graphene nanotube arrays and edge density-dependent capacitance in a supercapacitor application. We employ Ni-Au multi-block vertical nanotubes fabricated by anodic aluminum oxide template-assisted electrodeposition as a designer substrate for multilayer graphene growth. This edge generation of graphene relies on the distinct carbon solubility of Au and Ni under chemical vapor deposition. Therefore the graphene edge density is tailorable by controlling the total number of bimetallic interfaces of alternating electrodeposited Ni and Au blocks. In supercapacitor applications, we found that the capacitance heavily correlates to the graphene edge densities. Multilayer graphene nanotubes with 18 bimetallic interfaces exhibit 8.4 times higher capacitance than those without interfaces. This experimental evaluation shows great promise to significantly enhance the supercapacitor capacitance by creating high-density edges on multilayer graphene.
在这项工作中，我们展示了富含边缘的垂直多层石墨烯纳米管阵列的合成以及在超级电容器应用中边缘密度依赖的电容。我们采用通过阳极氧化铝模板辅助电沉积制备的镍 - 金多块垂直纳米管作为多层石墨烯生长的定制衬底。石墨烯的这种边缘生成依赖于化学气相沉积下金和镍不同的碳溶解度。因此，通过控制交替电沉积的镍和金块的双金属界面总数，可以调整石墨烯的边缘密度。在超级电容器应用中，我们发现电容与石墨烯边缘密度密切相关。具有18个双金属界面的多层石墨烯纳米管的电容比没有界面的高出8.4倍。该实验评估显示出通过在多层石墨烯上创建高密度边缘来显著提高超级电容器电容的巨大潜力。
