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Fabrication of thickness controllable free-standing sandwich-structured hybrid carbon film for high-rate and high-power supercapacitor.

Wei H, Wei S, Tian W, Zhu D, Liu Y, Yuan L, Li X - Sci Rep (2014)

Bottom Line: Here we demonstrate a simple approach to fabricate free-standing sandwich-structured hybrid carbon film composed of porous amorphous carbon film and multilayer graphene film by chemical vapor deposition in a controllable and scalable way.Supercapacitors assembled by hybrid carbon films exhibit ultrahigh rate capability, wide frequency range, good capacitance performance, and high-power density.Moreover, this approach may provide a general path for fabrication of hybrid carbon materials with different structures by using different metals with high carbon solubility, and greatly expands the application scope of carbon materials.

View Article: PubMed Central - PubMed

Affiliation: School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei. 430074, PR China.

ABSTRACT
Hybrid carbon films composed of graphene film and porous carbon film may give full play to the advantages of both carbon materials, and have great potential for application in energy storage and conversion devices. Unfortunately, there are very few reports on fabrication of hybrid carbon films. Here we demonstrate a simple approach to fabricate free-standing sandwich-structured hybrid carbon film composed of porous amorphous carbon film and multilayer graphene film by chemical vapor deposition in a controllable and scalable way. Hybrid carbon films reveal good electrical conductivity, excellent flexibility, and good compatibility with substrate. Supercapacitors assembled by hybrid carbon films exhibit ultrahigh rate capability, wide frequency range, good capacitance performance, and high-power density. Moreover, this approach may provide a general path for fabrication of hybrid carbon materials with different structures by using different metals with high carbon solubility, and greatly expands the application scope of carbon materials.

No MeSH data available.


Metallographic microscope topographies of Ni foil surface.(a) Pure Ni foil. Ni foil is corroded in ferric chloride solution after (b) 5 minutes, (c) 10 minutes, (d) 20 minutes, (e) 30 minutes, and (f) 40 minutes. Insets are enlarged microscope topographies. The scale bar represents 20 μm.
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f3: Metallographic microscope topographies of Ni foil surface.(a) Pure Ni foil. Ni foil is corroded in ferric chloride solution after (b) 5 minutes, (c) 10 minutes, (d) 20 minutes, (e) 30 minutes, and (f) 40 minutes. Insets are enlarged microscope topographies. The scale bar represents 20 μm.

Mentions: Surface topographies of the Ni foil at the initial stage of corrosion process are investigated by metallographic microscope, and shown in Figure 3. Figure 3a shows the surface topography of pure Ni foil before APCVD growth, which is gray and shows pronounced striations. Immersing the Ni foil into ferric chloride solution, the striation lines are still clearly shown after 5 minutes (Figure 3b), implying the Ni foil is slightly corroded. Noteworthy, part of the surface is covered by a layer of discontinuous film-like structure, which is pale brown yellow (inset in Figure 3b). The surface morphology and elemental composition of the film-like structure are observed by SEM and EDS, and shown in Figure S1 (Supplementary information). The SEM image shows two regions with different colors (dark and gray), and the EDS analysis clearly shows the carbon content in dark region is 35.58%, five times higher than that in gray region (7.12%). This result indicates that the film-like structure is carbon film. With the increase in corrosion time, the surface is almost covered by the carbon film, which becomes brown (Figure 3c and inset). It is interesting to note that the carbon film close to the grain boundaries of Ni foil becomes light blue color (inset in Figure 3c). Further increasing corrosion time, the surface is totally covered by carbon film (Figure 3d). The area of the blue region gradually increases, and the color becomes gradually from light blue to dark blue, and then to dark purple (Figure 3d–f), implying the increase of the carbon film thickness.


Fabrication of thickness controllable free-standing sandwich-structured hybrid carbon film for high-rate and high-power supercapacitor.

Wei H, Wei S, Tian W, Zhu D, Liu Y, Yuan L, Li X - Sci Rep (2014)

Metallographic microscope topographies of Ni foil surface.(a) Pure Ni foil. Ni foil is corroded in ferric chloride solution after (b) 5 minutes, (c) 10 minutes, (d) 20 minutes, (e) 30 minutes, and (f) 40 minutes. Insets are enlarged microscope topographies. The scale bar represents 20 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4231341&req=5

f3: Metallographic microscope topographies of Ni foil surface.(a) Pure Ni foil. Ni foil is corroded in ferric chloride solution after (b) 5 minutes, (c) 10 minutes, (d) 20 minutes, (e) 30 minutes, and (f) 40 minutes. Insets are enlarged microscope topographies. The scale bar represents 20 μm.
Mentions: Surface topographies of the Ni foil at the initial stage of corrosion process are investigated by metallographic microscope, and shown in Figure 3. Figure 3a shows the surface topography of pure Ni foil before APCVD growth, which is gray and shows pronounced striations. Immersing the Ni foil into ferric chloride solution, the striation lines are still clearly shown after 5 minutes (Figure 3b), implying the Ni foil is slightly corroded. Noteworthy, part of the surface is covered by a layer of discontinuous film-like structure, which is pale brown yellow (inset in Figure 3b). The surface morphology and elemental composition of the film-like structure are observed by SEM and EDS, and shown in Figure S1 (Supplementary information). The SEM image shows two regions with different colors (dark and gray), and the EDS analysis clearly shows the carbon content in dark region is 35.58%, five times higher than that in gray region (7.12%). This result indicates that the film-like structure is carbon film. With the increase in corrosion time, the surface is almost covered by the carbon film, which becomes brown (Figure 3c and inset). It is interesting to note that the carbon film close to the grain boundaries of Ni foil becomes light blue color (inset in Figure 3c). Further increasing corrosion time, the surface is totally covered by carbon film (Figure 3d). The area of the blue region gradually increases, and the color becomes gradually from light blue to dark blue, and then to dark purple (Figure 3d–f), implying the increase of the carbon film thickness.

Bottom Line: Here we demonstrate a simple approach to fabricate free-standing sandwich-structured hybrid carbon film composed of porous amorphous carbon film and multilayer graphene film by chemical vapor deposition in a controllable and scalable way.Supercapacitors assembled by hybrid carbon films exhibit ultrahigh rate capability, wide frequency range, good capacitance performance, and high-power density.Moreover, this approach may provide a general path for fabrication of hybrid carbon materials with different structures by using different metals with high carbon solubility, and greatly expands the application scope of carbon materials.

View Article: PubMed Central - PubMed

Affiliation: School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei. 430074, PR China.

ABSTRACT
Hybrid carbon films composed of graphene film and porous carbon film may give full play to the advantages of both carbon materials, and have great potential for application in energy storage and conversion devices. Unfortunately, there are very few reports on fabrication of hybrid carbon films. Here we demonstrate a simple approach to fabricate free-standing sandwich-structured hybrid carbon film composed of porous amorphous carbon film and multilayer graphene film by chemical vapor deposition in a controllable and scalable way. Hybrid carbon films reveal good electrical conductivity, excellent flexibility, and good compatibility with substrate. Supercapacitors assembled by hybrid carbon films exhibit ultrahigh rate capability, wide frequency range, good capacitance performance, and high-power density. Moreover, this approach may provide a general path for fabrication of hybrid carbon materials with different structures by using different metals with high carbon solubility, and greatly expands the application scope of carbon materials.

No MeSH data available.