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SCIENCE CHINA Materials, Volume 60, Issue 10: 947-954(2017) https://doi.org/10.1007/s40843-017-9094-5

Fabrication of multifunctional carbon encapsulated Ni@NiO nanocomposites for oxygen reduction, oxygen evolution and lithium-ion battery anode materials

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  • ReceivedJun 15, 2017
  • AcceptedAug 7, 2017
  • PublishedSep 6, 2017

Abstract

Multifunctional carbon encapsulated Ni@NiO nanocomposites (Ni@NiO@C) were synthesized for applications in oxygen reduction reactions (ORR), oxygen evolution reactions (OER) and lithium-ion batteries (LIB). The morphology was investigated via SEM and TEM, suggesting that the Ni@NiO@C nanocomposites have uniform and spherical core-shell structures. When the Ni@NiO@C nanocomposite is used as the catalyst in ORR, 90% of the initial current density can be maintained after 15 h in O2-saturated 0.1 mol L−1 KOH at 0.3 V under a rotation speed of 1600 rpm. As a catalyst for OER, the highest activity overpotential of the Ni@NiO@C nanocomposite electrocatalyst is 380 mV (vs. RHE) under the current density of 10 mA cm−2, and the Tafel slope was calculated to be 55 mV dec−1 by linear fitting. Electrochemical performances of the Ni@NiO@C nanocomposites used as LIB electrodes exhibited a long cycling life with a high capacity of 750 mA h g−1 after 400 cycles under 200 mA g−1.


Funded by

This work was supported by the National Natural Science Foundation of China (51571172,51672240,51571171,11404280)

Natural Science Foundation for Distinguished Young Scholars of Hebei Province(E2017203095)

Natural Science Foundation of Hebei Province(E2016203484,A2015203337)

Research Program of the College Science & Technology of Hebei Province(ZD2017083,QN2014047)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (51571172, 51672240, 51571171, and 11404280), the Natural Science Foundation for Distinguished Young Scholars of Hebei Province (E2017203095), the Natural Science Foundation of Hebei Province (E2016203484 and A2015203337), and the Research Program of the College Science & Technology of Hebei Province (ZD2017083 and QN2014047).


Interest statement

The authors declare that they have no conflict of interest.


Contributions statement

Xu D performed the experiments with help from Ruan W and Du X. Mu C wrote the manuscript with support from Wang B, Xiang J and Tian Y. Wen F and Liu Z conceived the research. All authors contributed to the general discussion.


Author information

Dongyang Xu was born in 1991. He received his Master’s degree in material physics from Yanshan University in 2017. His research interest focuses on the synthesis and application of porous carbon parcel metal and its oxide materials for the energy storage and electrochemical catalysis.


Congpu Mu was born in 1984 and joined Yanshan University in 2013. He completed his PhD in physics at Lanzhou University in 2013. His research is related to magnetic nanomaterials, from magnetic metals to magnetic oxide with their applications in microwave absorption and energy storage.


Supplement

Supplementary information

Supporting data are available in the online version of the paper.


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  • Figure 1

    Schematic illustration of the formation of Ni@NiO@C nanocomposites.

  • Figure 2

    (a) SEM image, (b) low- and (c) high-magnification TEM images, and (d) HRTEM image of the Ni@NiO@C nanocomposites.

  • Figure 3

    (a) XRD pattern, (b) Raman spectrum, (c) nitrogen adsorption-desorption isotherms, and (d) pore size distribution calculated from the adsorption isotherms of Ni@NiO@C nanocomposites.

  • Figure 4

    ORR catalytic activities of Ni@NiO@C. (a) CV curves of Ni@NiO@C in N2-saturated (black dashed line) and O2-saturated (red solid line) 1 mol L−1 KOH at a scan rate of 50 mV s−1. (b) Polarization curves of Ni@NiO@C at various rotation speeds with a scan rate of 5 mV s−1. (c) The corresponding KL plots at various potentials. (d) Current-time chronoamperometric response of Ni@NiO@C in O2-saturated 0.1 mol L−1 KOH at 0.3 V with a rotation speed of 1600 rpm for 15 h.

  • Figure 5

    Electrocatalytic OER performances of Ni@NiO@C nanocomposites: (a) OER polarization curve, (b) calculated Tafel slope, (c) cycling durability test, and (d) the chronoamperometric response measured at a current density of 10 mA cm−2 over 7 h.

  • Figure 6

    Electrochemical performances of the Ni@NiO@C nanocomposites for LIB applications: (a) CV curves, (b) galvanostatic discharge/charge voltage profiles at 200 mA g−1, (c) tests of rate performance at the increased rates from 100 to 1500 mA g−1, and (d) cycling performance at 200 mA g−1.

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