Supporting Information - rsc. · PDF fileSupporting Information . Facile synthesis of MnO....
Transcript of Supporting Information - rsc. · PDF fileSupporting Information . Facile synthesis of MnO....
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Supporting Information
Facile synthesis of MnO2-Ag hollow microspheres with sheet-like
subunits and their catalytic properties
Dan-Ling Zhou,a De-Jun Chen,b Pei-Pei Zhang,b Fang-Fang Li,b Jian-Rong Chen,a Ai-Jun Wanga*
and Jiu-Ju Feng a*
a College of Geography and Environmental Science, College of Chemistry and Life Science,
Zhejiang Normal University, Jinhua 321004, China
b College of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007,
China
*Corresponding author: Tel./Fax: 86-579-82282273; E-mail: [email protected] (AJW) and
E-mail: [email protected] (JJF)
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A
C D
B
Fig. S1. SEM images of the products prepared at different reaction temperature: room
temperature without hydrothermal treatment (A), 100 ºC (B), 160 ºC (C), and 200 ºC
(D).
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Fig. S2. (A) SEM image and XRD pattern (B) of the products prepared without
AgNO3.
30 μm
20 30 40 50 60 70 80
122211
024202
113110
006018
012
104
Inte
nsity
, cou
nts
2-Theta, degree
MnCO3
A
B
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Fig. S3. TEM image of the product obtained at 130 ºC for 0.5 h.
10 nm
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Fig. S4. High–magnification TEM image of the product obtained at 130 ºC for 2 h.
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A
D C
B
Fig. S5. SEM images of the products prepared at different reaction time: 1 h (A), 2 h
(B), 5 h (C), and 10 h (D).
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A B
C
D
Fig. S6. SEM images of the products prepared with different amount of urea: 0.024 g
(A), 0.144 g (B), 0.48 g (C), and 4.80 g (D).
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A
C
B
Fig. S7. SEM images of the products obtained with different molar ratios of Mn2+/Ag+:
2:1 (A), 1:1 (B), and 1:3 (C) at 130 ºC.
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Fig. S8. X–ray diffraction pattern of the product using the molar ratio (Mn2+/Ag+) of
2:1.
0 10 20 30 40 50 60 70 80 900
500
1000
1500
2000
2500MnCO3
AgAgAg
Ag
Inte
nsity
(a.u
.)
2Theta (degree)
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Fig. S9. Effects of the applied potentials on the steady-state responses of the
MnO2–Ag HMs modified CPE in a 25 mM phosphate solution (pH 7.0) containing
1.25 mM H2O2.
0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7
0
2
4
6
8
10
12
Curr
ent (µA
)
Potential (V)
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0 100 200 300 400 500 600
-150
-125
-100
-75
-50
-25
0
hgf
edcb
i
a
a
a
a
aa
aa
a. H2O2b. glucosec. SO42-
d. NO3-
e. CO32-
f. Cl-
g. ClO3-
h. UAi. AA
Curr
ent (µA
)
Time (s)
Fig. S10. Amperometric i-t curve of the MnO2–Ag HMs modified CPE with
successive addition of 1.0 mM H2O2, ClO3–, UA, and AA, as well as 10 mM glucose,
SO42–, NO3
–, CO32–, and Cl– ions in a 25 mM phosphate solution (pH 7.0) at –0.4 V.
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Table S1. Comparison of the MnO2–Ag HMs sensor with other MnO2 based H2O2
sensors.
Materials Stability
Linear ranges Detection
limit/ μM Refs.
MnO2–Ag HMs/CPE 90% (4 weeks) 1.31 µM ~ 36.71 mM 1.31 Our work β–MnO2 nanorods 90% (30 days) 2.45 μM ~ 42.85 mM 2.45 1
Ag–MnO2–MWCNTs 90% (3 days) 5.0 μM ~ 10.4 mM 1.7 2 MnO2 microspheres 89.0% (4 weeks) 10.0 μM ~ 0.15 mM 2.0 3
MnO2/graphene oxide
90% (4 weeks) 5 μM ~ 0.6 mM 0.8 4
MnO2/carbon fiber not detected 12 μM ~ 0.26 mM 5.4 5 MnO2–mesoporous
carbon 92% (1 month) 0.5 μM ~ 0.6 mM 0.07 6
MnO2–VACNTs 92% (30 days) 1.2 µM ~ 1.8 mM 0.8 7
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