Preparation of Few Layer Three‐dimensional Graphene Networks by CVD for Energy Storage Applications

Abstract

Three-dimensional graphene networks (3DGNs) with a controllable number of layers (from monolayer to few layers) are fabricated by CVD on a Ni foam rod (NFR) template. The special morphology of the NFR and accompanying concentration gradients of CH 4 gas provide the necessary conditions to deposit the 3DGNs with varied thicknesses on different areas of one substrate. The high conductivity, large Brunner-Emmett-Teller (BET) area, and three-dimensional network of the 3DGNs make it a potential material for use in the electrochemical field. Supercapacitors with the 3DGNs-based electrode show a high energy density $34.2 Wh kg À1 at a current density of 100 mA g À1 , and a specific capacitance of 246 F g À1 is obtained in a 30 wt.-% KOH aqueous electrolyte solution. Moreover, the resultant devices maintain high performances under high current density conditions, indicating the outstanding stability of the prepared 3DGNs.

Application of graphene as filler to improve thermal transport property of epoxy resin for thermal interface materials

“…Detailed characterizations including morphology, BET surface areas and conductivities of the prepared 3DGNs and RGO have been reported by our group elsewhere [21][22][23][24]. Fig.…”

“…The value of d is very small for the RGO ($3.1 Â 10 À9 m 2 K W À1 ) and 3DGNs ($6.3 Â 10 À9 m 2 K W À1 ) modified composites (based on our previous study, the average thicknesses of RGO is about ten-layers $3.4 nm, and the 3DGNs is assumed with three-layers structure $1 nm) [21][22][23][24] , which are much smaller than that of other carbon materials modified epoxy resin (such as CNTs $10 À8 m 2 K W À1 , black carbon >10 À6 m 2 K W À1 and NG $3.8 Â 10 À7 m 2 K W À1 ). Moreover, the obtained values are in agreement with the molecular dynamics (MD) simulations [26,[31][32][33][34].…”

“…The 3DGNs and RGO are prepared by CVD and chemical exfoliation-reduction process, and more details have been reported in our previous reports [21][22][23][24].…”

“…The two steps are repeated for three or four times. The dropped epoxy resin penetrates into the 3DGNs easily because of the porosity of the 3DGNs [22,24]. Finally, the 3DGNs-epoxy resin mixture was cured at 110°C for 1 h. The RGO-epoxy resin was prepared by physical mixing.…”

RGO and Three-Dimensional Graphene Networks Co-modified TIMs with High Performances

“…Based on our recent report, a moderated amount of surface defects of the 3DGNs can play as a positive role to improve the contact between the graphene basal plane and matrix [10, 11]. However, some tedious adjustment processes including a precise CH 4 flow and a strict cooling rate of the substrate are needed during the CVD procedure [12]. Therefore, an idea on combining the RGO nanosheets and 3DGNs to utilize their advantages is naturally presented.…”