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Synthesis of Microscopic 3D Graphene for High‐Performance Supercapacitors with Ultra‐High Areal Capacitance

Journal Article · · Small Methods
 [1];  [2];  [1];  [1];  [1];  [2]
  1. National Energy Technology Laboratory 626 Cochran Mill Road Pittsburgh PA 15236 USA; NETL Support Contractor 626 Cochran Mill Road Pittsburgh PA 15236 USA
  2. National Energy Technology Laboratory 626 Cochran Mill Road Pittsburgh PA 15236 USA
AbstractDespite graphene being considered an ideal supercapacitor electrode material, its use in commercial devices is limited because few methods exist to produce high‐quality graphene at a large scale and low cost. A simple method is reported to synthesize 3D graphene by graphenization of coal tar pitch with a K2CO3 catalyst. This produces 3D graphenes with high specific surface areas up to 2113 m2 g−1 and exceptional crystallinity (Raman ID/IG as low as ≈0.15). The material has an outstanding specific capacitance of 182.6 F g−1 at a current density of 1.0 A g−1. This occurs at a mass loading of 30 mg cm−2 which is 3 times higher than commercial requirements, yielding an ultra‐high areal capacitance of 5.48 F cm−2. The K2CO3 is recycled and reused over 10 cycles with material quality and electrocapacitive performance of 3D graphene retained and verified after each cycle. The synthesis method and resulting electrocapacitive performance properties create new opportunities for using 3D graphene more broadly in practical supercapacitor devices.
Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy and Carbon Management (FECM); USDOE Office of Fossil Energy and Carbon Management (FECM), Office of Carbon Management
OSTI ID:
2371808
Alternate ID(s):
OSTI ID: 2429340
Journal Information:
Small Methods, Journal Name: Small Methods Journal Issue: 9 Vol. 8; ISSN 2366-9608
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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