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This content will become publicly available on February 22, 2019

Title: Design and Synthesis of 3D Potassium-Ion Pre-Intercalated Graphene for Supercapacitors

Here in this paper, a novel material—3D potassium-ion preintercalated graphene—was designed and synthesized via one step using a new reaction between K and CO. Furthermore, this material exhibited excellent performance as electrodes for aqueous symmetrical supercapacitors. When the electrode was scaled up from 3.0 to 8.0 mg/cm 2, negligible capacitance degradation was observed, leading to a very high areal capacitance of 1.50 F/cm 2 at 1 A/g. Furthermore, even if a large operating temperature of -15 or 55 °C was employed, its excellent electrochemical performance remained with specific capacitances of 208 F/g at 55 °C, 184 F/g at 25 °C, and 98 F/g at -15 °C. This could be attributed to 3D structure and K+ preintercalation of the material, which provides rich active sites for electric double-layer formation, lower ion transport resistance, and shorter diffusion distance.
Authors:
 [1] ; ORCiD logo [2] ; ORCiD logo [3]
  1. Michigan Technological Univ., Houghton, MI (United States). Dept. of Materials Science and Engineering
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  3. Michigan Technological Univ., Houghton, MI (United States). Dept. of Materials Science and Engineering; Shanghai Jiao Tong Univ. (China). School of Environmental Science and Engineering
Publication Date:
Report Number(s):
BNL-203641-2018-JAAM
Journal ID: ISSN 0888-5885
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 57; Journal Issue: 10; Journal ID: ISSN 0888-5885
Publisher:
American Chemical Society (ACS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1436450