03 supporting information - royal society of chemistry · 2011-01-27 · 1 supporting information...

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Supporting Information Flexible Energy Storage Devices Based on Graphene Paper Hyeokjo Gwon, a Hyun-Suk Kim,§a Kye Ung Lee, a Dong-Hwa Seo, a Yun Chang Park,b Yun-Sung Leec, Byung Tae Ahn, a and Kisuk Kang*a,d a Department of Materials Science and Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejon, 305-701, Republic of Korea. Fax: +82 42 350 3310; Tel: +82 42 350 3381; E-mail: [email protected] or [email protected] §Present Address: Display Laboratory, Samsung Advanced Institute of Technology, Mt. 14-1, Nongseo-Dong, Giheung-Gu, Yongin-si, Gyeonggi-Do 446-712, Republic of Korea b National Nano Fab Center, 291 Daehak-ro, Yuseong-gu, Daejon, 305-806, Republic of Korea. cFaculty of Applied Chemical Engineering, Chonnam National University, Gwang-ju, 500-757, Republic of Korea dDepartment of Materials Science and Engineering, Seoul National University, Gwanak-gu, Seoul, 151-742, Republic of Korea

Supporting figures

Figure S1. The XRD spectra of (a) pristine graphite, (b) graphene paper, and (c) V2O5/graphene paper.

The broad peak labeled with an asterisk (*) comes from the sample holder tape.

10 20 30 40 50

Inte

nsity

(arb

. uni

ts)

2 Theta (degree)

(a) Pristine graphite

(002)

(b) graphene paper

(c) V2O5/graphene paper

*

**

Supplementary Material (ESI) for Energy & Environmental ScienceThis journal is © Royal Society of Chemistry 2011

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Figure S2-1. The Raman spectra of (a) pristine graphite, (b) graphene powder, (c) graphene paper (as-

fabricated), and (d) graphene paper (after 150 cycles).

D/G =1.15

D/G =1.03

D/G = 1.13

Raman Shift (cm-1)

Inte

nsity

(arb

. uni

ts)

Pristine graphite

Graphene powder

Graphene paper(as-fabricated)

Graphene paper(after 150 cycles)

d

c

b

a

1000 1200 1400 1600 1800

G

DD/G = 0.21


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Figure S2-2. The Raman spectroscopy of V2O5/graphene paper.

200 400 600 800 1000 1200

Inte

nsity

(a.u

.)

Raman Shift (cm-1)

922 cm-1


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Figure S3. AFM images of (a) graphene paper and (b) V2O5 film grown on graphene paper.

μm

μm

μm

μm

b

a


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Figure S4. The top left panel represents the plan-view SEM image of V2O5 film, grown on graphene

paper. Other panels show the elemental mapping for vanadium, oxygen, and carbon in the scanned

region.

V Kα

C Kα O Kα

2 μm


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Figure S5. Nitrogen adsorption and desorption isotherms for reduced graphene powder. The shape of

the isotherms shows that the reduced graphene has both micro and mesoporous structures.

0.0 0.2 0.4 0.6 0.8 1.00

100

200

300

400

Ads

orpt

ion

capa

city

(cm

3 /g)

at S

TP

Relative pressure

Nitrogen Adsorption Isothermal

Adsorption

Desorption


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Figure S6. Specific capacity of the battery device cycled between 3.8 and 1.7 V at a constant current of

10 μA/cm2.

0 5 10 151.0

1.5

2.0

2.5

3.0

3.5

4.0

Capacity (μAh cm-2)

Volta

ge (V

)

Cathode - V2O5 film on graphene paperAnode - Lithiated graphene paper

Cycle increase


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Supporting Information

The percentage of V2O5 in the V2O5/graphene composite

The weight of V2O5/graphene paper before and after deposition was measured. (Sartorius, Model

ME5; resolution 1 μg). The mass of graphene paper substrate (0.6 mm by 0.6 mm) was ~100 μg and that

of V2O5/graphene paper was ~120 μg. From these two values, we could confirm the percentage of V2O5

in the V2O5-graphene composite. (~20%)


03 supporting information - royal society of chemistry · 2011-01-27 · 1 supporting information...

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