Journal
NANO ENERGY
Volume 24, Issue -, Pages 158-164Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.04.019
Keywords
Hierarchical nanoporous graphene; Hydrogenated graphite; Solid-state supercapacitor; Nanoporous copper; Chemical vapor deposition
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Funding
- Key Program of the National Natural Science Foundation of China [51531004]
- National Natural Science Foundation of China [51472177]
- Tianjin Research Program of Application Foundation and Advanced Technology [14JCYBJC20900, 14JCYBJC19600]
- China-EU Science and Technology Cooperation Project [SQ2013ZOA100006]
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT) of the Ministry of Education of China [IRT13084]
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Continuously hierarchical nanoporous graphene (hnp-G) films are synthesized by a combination of low-temperature CVD growth of hydrogenated graphite (HG) coating on nanoporous copper (NPC) and rapid catalytic pyrolysis of HG at high temperature. Low-temperature growth of HG coating on NPC can obviously delay the coarsening evolution of NPC at high temperature, providing the precondition to obtain hnp-G with small pore size (1-150 nm) by catalytic pyrolysis at high temperature. The high specific surface area (1160 m(2)/g) of hnp-G are mainly originated from the external surface (954.7 m(2)/g), resulting in fully accessible channels for ion transport. More importantly, the continuously 3D hierarchical nanoporous structure and fully wettability of the hnp-G with gelled electrolyte not only effectively prevent the restacking of graphene even under dramatic squeezing but also guarantee the continuous and short electron/ion diffusion pathway in the whole electrodes, resulting in ultrahigh specific capacitance (38.2 F/cm(3) based on the device) and excellent rate performance. The symmetric SC offers ultrahigh energy density (2.65 mW h/cm(3)) and power density (20.8 W/cm(3)) and exhibits almost identical performance at various curvatures and excellent lifetime (94% retention after 10,000 cycles), suggesting its wide application potential in powering wearable/miniaturized electronics. (C) 2016 Elsevier Ltd. All rights reserved.
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