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This content will become publicly available on October 11, 2018

Title: Direct conversion of CO 2 to meso/macro-porous frameworks of surface-microporous graphene for efficient asymmetrical supercapacitors

CO 2 conversion to useful materials is the most attractive approach to control its content in the atmosphere. An ideal electrode material for supercapacitors should possess suitable meso/macro-pores as electrolyte reservoirs and rich micro-pores as places for the adsorption of electrolyte ions. In this paper, we designed and synthesized such an ideal material, meso/macro-porous frameworks of surface-microporous graphene (MFSMG), from CO 2via its one-step exothermic reaction with potassium. Furthermore, the MFSMG electrode exhibited a high gravimetric capacitance of 178 F g -1 at 0.2 A g -1 in 2 M KOH and retained 85% capacitance after increasing current density by 50 times. The combination of the MFSMG electrode and the activated carbon (AC) electrode constructed an asymmetrical AC//MFSMG capacitor, leading to a high capacitance of 242.4 F g -1 for MFSMG and 97.4 F g -1 for AC. With the extended potential, the asymmetrical capacitor achieved an improved energy density of 9.43 W h kg -1 and a power density of 3504 W kg -1. Finally, this work provides a novel solution to solve the CO 2 issue and creates an efficient electrode material for supercapacitors.
Authors:
 [1] ;  [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
  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-203294-2018-JAAM
Journal ID: ISSN 2050-7488
Grant/Contract Number:
SC0012704; CBET-0931587; CMMI-1661699
Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 5; Journal Issue: 44; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Research Org:
Michigan Technological Univ., Houghton, MI (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1425088