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Title: Ultrafast hydrothermal assembly of nanocarbon microfibers in near-critical water for 3D microsupercapacitors
Authors: Zhai, Shengli
Wei, Li.
Karahan, Huseyin Enis
Wang, Yanqing
Wang, Chaojun
Montoya, Alejandro
Shao, Qian
Wang, Xin
Chen, Yue
Keywords: Engineering::Chemical engineering
Issue Date: 2018
Source: Zhai, S., Wei, L., Karahan, H. E., Wang, Y., Wang, C., Montoya, A., . . . Chen, Y. (2018). Ultrafast hydrothermal assembly of nanocarbon microfibers in near-critical water for 3D microsupercapacitors. Carbon, 132, 698-708. doi:10.1016/j.carbon.2018.02.089
Journal: Carbon
Abstract: Translating the advantages of carbon nanomaterials into macroscopic energy storage devices is challenging because the desirable nanoscale properties often disappear during assembly processes. Here we describe a new nonequilibrium subcritical hydrothermal method capable of independently manipulating the temperature and pressure to create unique assembly conditions crossing the commonly used liquid-vapor boundary. Highly conductive and dense-packed yet ion-accessible nanocarbon microfibers can be obtained from graphene oxide sheets, single-walled carbon nanotubes, and a nitrogen-doping crosslinker under 20 min of hydrothermal assembly, 80% energy saving compared to standard hydrothermal methods, and one of the shortest time in the field of hydrothermal processing of carbon nanomaterials. Using those microfibers, we built microsupercapacitors that reach a high volumetric capacitance of 52 F cm−3, energy density of 7.1 mWh cm−3, and power density of 1645.7 mW cm−3, respectively. We further demonstrate the 3D integration of multiple fiber microsupercapacitors that reduces the device footprint by 75% while expanding the operational voltage and current window. This strategy is a promising tool for harmoniously assembling carbon nanostructures as energy storage components for various energy applications.
ISSN: 0008-6223
DOI: 10.1016/j.carbon.2018.02.089
Rights: © 2018 Elsevier Ltd. All rights reserved
Fulltext Permission: none
Fulltext Availability: No Fulltext
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