Nano Res.
Electronic Supplementary Material
A bio-inspired Co3O4-polypyrrole-graphene complex as
an efficient oxygen reduction catalyst in one-step ball
milling
Guangyuan Ren1,2, Yunan Li1, Zhaoyan Guo1, Guozheng Xiao1, Ying Zhu1 (), Liming Dai3 (), and Lei Jiang1
1
Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and
Environment, Beihang University, Beijing 116023, China
2
School of Chemistry, Biology and Materials Science, East China Institute of Technology, Nanchang 330013, China
3
Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA
Supporting information to DOI 10.1007/s12274-015-0844-5
Figure S1 (a) Size analysis of the Co3O4-PPy/GN composite in ultrapure water measured from dynamic light scattering, (b) the AFM
image of the Co3O4-PPy/GN.
Address correspondence to Ying Zhu, [email protected]; Liming Dai, [email protected]
Nano Res.
Figure S2 SEM image of the pristine graphite.
Figure S3 High-resolution XPS O1s spectrum of the Co3O4-PPy/GN composite.
Figure S4 CV curves of the PPy/GN, Co3O4/GN, Co3O4-PPy/GN and Pt-C on glassy carbon electrodes in O2-saturated 0.1 M KOH at
a scan rate of 50 mV·s–1.
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Nano Res.
Figure S5 LSV curves of (a) Co3O4/GN, (b) PPy/GN, (c) Pt-C, and (d) Co3O4-PPy/GN on glassy carbon electrodes in O2-saturated
0.1 M KOH at a scan rate of 50 mV·s–1.
Figure S6 XRD patterns of the as-prepared Co3O4-PPy/GN and Co3O4/GN catylysts.
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Nano Res.
Table S1
Table S2
Materials information of the samples for the ball-milling preocess
Chemicals (unit)
Co3O4-PPy/GN
Co3O4/GN
PPy/GN
Graphite flakes (g)
1
1
1
Co(NO3)2·6H2O (g)
6
6
0
Pyrrole (mL)
2
0
2
Electrochemical parameters for ORR estimated from CVs and LSV curves
Electrocatalysts
Obtained from CV curves in Fig. S4
Obtained from LSV curves in Fig. 4(b)
Eonset (V)
Epeak (V)
jpeak (mA·cm–2)
Eonset (V)
E1/2 (V)
jlimited (mA·cm–2)
PPy-GN
–0.247
–0.337
0.724
–0.246
–0.339
2.096
Co3O4/GN
Co3O4-PPy/GN
–0.169
–0.241
1.203
–0.142
–0.228
3.771
–0.102
–0.196
1.422
–0.118
–0.196
4.471
Pt/C
–0.045
–0.175
1.269
–0.072
–0.178
4.941
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