Non-Enzymatic Hydrogen Peroxide Electrochemical … · /CF1 MnO 2 /CF2 MnO 2 /CF3 MnO 2 /CF5 001...
Transcript of Non-Enzymatic Hydrogen Peroxide Electrochemical … · /CF1 MnO 2 /CF2 MnO 2 /CF3 MnO 2 /CF5 001...
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Electronic Supplementary Information
Non-Enzymatic Hydrogen Peroxide Electrochemical Sensor Based
on Three-Dimensional MnO2 Nanosheets/Carbon Foam Composite
Shuijian He, a, b Boya Zhang, a Minmin Liu a, b and Wei Chen a, *
aState Key Laboratory of Electroanalytical Chemistry, Changchun institute of Applied
Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China, and
bUniversity of Chinese Academy of Sciences, Beijing 100039, China
Corresponding author: [email protected], Tel. +86-431-85262061
Electronic Supplementary Material (ESI) for RSC Advances.This journal is © The Royal Society of Chemistry 2014
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F
1 μm
1 m
A
1 μm
E
B
1 m
C
1 m
D
1 m
Fig. S1 Cross section view SEM images of the as-prepared 3D porous nanomaterials, carbon foam
(CF, A), MnO2/CF0.5 (B), MnO2/CF1 (C), MnO2/CF2 (D), MnO2/CF3 (E) and MnO2/CF5 (F).
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Fig. S2 (A) EDS spectrum of MnO2/CF0.5. (B) XRD patterns of the carbon foam (CF) and the
MnO2/CF composites. (C, D) XPS survey spectra of MnO2/CF0.5 (C) and the core-level XPS
signals of Mn 2p (D).
660 655 650 645 640 635
11.7 eV
Mn 2p3/2
Mn 2p1/2
Inte
nsit
y (a
.u.)
2 (degree)
20 40 60 80
C foam
MnO2
Inte
nsity
(a.
u.)
2 (degree)
JCPDS 42-1317 CF MnO
2/CF0.5
MnO2/CF1
MnO2/CF2
MnO2/CF3
MnO2/CF5
001
002
111
100020
B
C D
A
0 2 4 6
Mn
C
O
K MnMn
Binding Energy (keV)
700 600 500 400 300 200
C 1
sO 1
s
Mn
2p
Binding Energy (eV)
Inte
nsit
y (a
.u.)
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Fig. S3 Thermogravimetric (TG) plots of CF and MnO2/CF composites.
0 150 300 450 6000
20
40
60
80
100
Wei
ght p
erce
nt (
%)
Temperature (oC)
MnO2/CF0.5
MnO2/CF1
MnO2/CF2
MnO2/CF3
MnO2/CF5
5
-0.6 -0.3 0.0 0.3
-1.8
-1.2
-0.6
0.0
0 mM 1 mM 2 mM 3 mM 4 mM 5 mM
Cur
rent
(10
-4 A
)
Potential (V)-0.6 -0.3 0.0 0.3
-9
-6
-3
0
3
0 mM 1 mM 2 mM 3 mM 4 mM 5 mM
Cur
rent
(10
-4 A
)
Potential (V)
-0.9 -0.6 -0.3 0.0 0.3-9
-6
-3
0
3
Cur
rent
(10
-4 A
)
Potential (V)
0 mM 1 mM 2 mM 3 mM 4 mM 5 mM
-0.9 -0.6 -0.3 0.0 0.3
-1.5
-1.0
-0.5
0.0
Cur
rent
(10
-4 A
)
Potential (V)
0 mM 1 mM 2 mM 3 mM 4 mM 5 mM
A B
C D
Fig. S4 CVs of MnO2/CF0.5 (A), MnO2/CF1 (B), MnO2/CF3 (C) and MnO2/CF5 (D) in 0.1 M
PBS solution (pH=7.4) with the absence and presence of H2O2 at the scan rate of 0.02 V/s.
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-0.6 -0.3 0.0 0.3
-9
-6
-3
0
3
MnO2/CF2, 0 mM H
2O
2
MnO2/CF3, 0 mM H
2O
2
MnO2/CF2, 3 mM H
2O
2
MnO2/CF3, 3 mM H
2O
2
Cur
rent
(1
03 A/g
)
Potential (V)
Fig. S5 CVs of MnO2/CF2 and MnO2/CF3 electrodes in 0.1 M PBS solution (pH=7.4) with
absence and presence of 3 mM H2O2. Potential scan rate 0.02 V/s. The currents are normalized to
the mass loading of MnO2.
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0 300 600 900 1200 1500
-1.2
-0.9
-0.6
-0.3
0.0
200 300 400 500 600
-1.2
-1.0
-0.8
-0.6
Cur
rent
(10
- 4 A
)
Time (s)
a cb d ef
Cur
rent
(10-
5 A)
Time (s)
0 500 1000 1500-2.0
-1.5
-1.0
-0.5
0.0
200 300 400 500 600-4.6
-4.5
-4.4
-4.3
-4.2
Cur
rent
(10
- 4 A
)
Time (s)
a b c d ef
Cur
rent
(10-5
A)
Time (s)
0 300 600 900 1200
-0.6
-0.5
-0.4
-0.3
-0.2
200 300 400 500 600-2.8
-2.7
-2.6
-2.5
Cur
rent
(10
- 4 A
)
Time (s)
a b c de
f
Cur
rent
(10-5
A)
Time (s)
0 1 2 3 4 5-8
-6
-4
-2
Cur
rent
(10-
5 A)
Concentration of H2O
2 (mM)
0 2 4 6 8
-16
-12
-8
-4
Cur
rent
(10-
4 A)
Concentration of H2O
2 (mM)
0 1 2 3 4
-5.6
-4.8
-4.0
-3.2
-2.4
Cur
rent
(10-
5 A)
Concentration of H2O
2 (mM)
E
A B
C D
F
Fig. S6 The amperometric responses of the electrode to H2O2, MnO2/CF0.5 (A), MnO2/CF1 (C),
MnO2/CF3 (E), with 10 μL 7.5 mM, 15 mM, 60 mM, 0.15 M, 0.6 M and 1.5 M H2O2 added into
the PBS solution at a, b, c, d, e, f, respectively. Insets are the corresponding amperometric
responses to low H2O2 concentrations at the MnO2/CF electrodes. (B, D, F) The corresponding
plots of the response current vs. the H2O2 concentration obtained from the MnO2/CF0.5,
MnO2/CF1, and MnO2/CF3 electrodes, respectively.
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0 20 40 60 80 1000
15
30
45
60
Z' ()
-Z" (
)
MnO2/CF0.5
MnO2/CF1
MnO2/CF2
MnO2/CF3
MnO2/CF5
0 400 800 1200 16000
400
800
1200
1600 MnO
2/CF0.5
MnO2/CF1
MnO2/CF2
MnO2/CF3
MnO2/CF5
-Z" (
)
Z' ()
A B
Fig. S7 (A) Nyquist electrochemical impedance spectra of the sensors based on the MnO2/CF
composites (B) the enlarge view of Nyquist plots at high frequency region in (A).