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Supplementary material
In-situ hydrothermal synthesis of MnO2/NiO@Ni hetero structure
electrode for hydrogen evolution reaction and high energy
asymmetric supercapacitor application
Sanjit Saha,a,b Suman Chhetri,a,b Partha Khanra,c Pranab Samanta,a,b Hyeyoung Koo,d Naresh
Chandra Murmua,b and Tapas Kuila a,b*
a Surface Engineering & Tribology Division, CSIR-Central Mechanical Engineering Research
Institute, Durgapur -713209, India
b Academy of Scientific and Innovative Research (AcSIR), CSIR-CMERI Campus,
Durgapur-713209
c Soft Innovative Materials Research Centre, Korea Institute of Science and Technology
(KIST), Jeonbuk 565905, South Korea
d Soft Innovative Materials Research Centre, Institute of Advanced Composite Materials,
Korea Institute of Science and Technology (KIST), Jeonbuk 565905, South Korea
*Correspondence to: Tapas Kuila, E-mail: [email protected]; Tel: +91 9647205077
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Sample preparation for characterization
Small pieces of MnO2/NiO@Ni were directly used for the FE-SEM analysis.
MnO2/NiO@Ni was scratched to collect the powder sample of MnO2/NiO composite.
The collected powder was used for XRD and FT-IR analysis. A thin pellet (thickness ~
xx) was prepared with the collected powder for the electrical conductivity
measurement. The dispersion of MnO2/NiO powder in distilled water was used for the
UV-vis spectroscopy measurement. The MnO2/NiO powder was dispersed in an
ethanol by 30 min ultra sonication and the dispersion was drop casted onto a fresh
lacey carbon copper grid for the TEM analysis.
The MnO2/NiO@Ni was directly used for the electrochemical measurement. Three
electrode measurements were carried out by using 3 cm × 0.5 cm MnO2/NiO@Ni as
working electrode. In case of two-electrode measurement, the MnO2/NiO@Ni was cut
into a circle shape with a diameter of 1 cm.
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Figure S1 XRD pattern of MnO2/NiO.
Figure S2 FT-IR spectra of MnO2/NiO.
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Figure S3 UV-visible absorption spectra of MnO2/NiO. The inset view of the same
shows the (αhν)2 vs. hν plot.
Figure S4 The variation of conductivity of MnO2/NiO with different temperature.
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Figure S5 CV of MnO2/NiO at 1 M aqueous KOH electrolyte.
Figure S6 Comparative CV of bare Ni-foam and MnO2/NiO@Ni at 1 M Na2SO4
electrolyte.
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Fig. S7 (a) TEM and (b) SAED pattern image of TRG.
Fig. S8 Raman spectra of GO and TRG. TRG has two characteristic peaks, G peak
(1574 cm-1) and 2D peak (2676 cm-1). The 2D peak is associated with the band
structure of the graphene layers originating from the two phonon double resonance.1, 2
The D band (1348 cm-1) indicates the presence of defects within the graphitic
structure.1 The formation of sp3 carbon within the sp2 network can generate the defect.
The degree of disorder in a sp2 network structure of graphene can be measured by ID/IG
ratio.1
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Figure S9 CD profile of ASC recorded at different cycles.
[1] T. Kuila, P. Khanra, N. H. Kim, S. K. Choi, H. J. Yun and J. H. Lee,
Nanotechnology 24 (2013) 364706.
[2] S. Bose, T. Kuila, A. K. Mishra, N. H. Kim and J. H. Lee, Nanotechnology 22
(2011) 405603.
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