NiS/Ni3S2@NiWO4 nanoarrays towards all-solid-state hybrid supercapacitor with record-high energy density

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  • ReceivedJun 2, 2020
  • AcceptedAug 14, 2020
  • PublishedOct 29, 2020


Funded by

the National Natural Science Foundation of China(91963113)


This work was supported by the National Natural Science Foundation of China (91963113).

Interest statement

The authors declare no conflict of interest.

Contributions statement

Chen Y and Chen F conceived the idea of this study and wrote the paper. Cui X and Liu C conducted the synthesis the characterization of the electrode and revised the manuscript. All authors contributed to discussion and manuscript revision.

Author information

Fangshuai Chen received his MSc degree from the Northwest Normal University in 2019. He works as a research assistant at the School of Materials Science and Engineering, Tianjin University from 2019 to 2020. His current research focuses on the design and synthesis of nanomaterials for energy storage.

Yida Deng is a professor at the School of Materials Science and Engineering, Tianjin University. He received his PhD from Shanghai Jiao Tong University in 2006. His research interests include metal and metal oxide nanostructures for electrochemical and energy applications.

Yanan Chen is a professor at the School of Materials Science and Engineering, Tianjin University. He received his joint PhD from the University of Science and Technology Beijing/University of Maryland in 2017. He was an advanced innovative fellow at Tsinghua University before joining in Tianjin University. His research mainly focuses on nanomaterials, devices, and systems for advanced energy storage and conversion.


Supplementary information

Experimental details and supporting data are available in the online version of the paper.


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  • Figure 1

    Schematic illustration of the fabrication of the core-shell NiS/Ni3S2@NiWO4 nanoarrays.

  • Figure 2

    (a–c) SEM images, (d) TEM image, (e) HRTEM images and (f) SAED pattern of the NiS/Ni3S2@NiWO4 nanoarrays on Ni foam. (g–k) TEM-EDS elemental mapping images of a typical NiS/Ni3S2@NiWO4 nanorod.

  • Figure 3

    (a) XRD patterns of the NiS/Ni3S2 and NiS/Ni3S2@NiWO4 on Ni foam. XPS spectra of the core-shell NiS/Ni3S2@NiWO4 nanorod arrays on Ni foam: (b) full spectrum, (c) Ni 2p, (d) W 4f and (e) S 2p.

  • Figure 4

    (a) CV curves of NiWO4, NiS/Ni3S2 and NiS/Ni3S2@NiWO4 at 5 mV s−1. (b) CV curves of NiS/Ni3S2@NiWO4 from 5 to 30 mV s−1. (c) The plots of log(i) versus log(v) for NiS/Ni3S2@NiWO4. (d) GCD curves of NiWO4, NiS/Ni3S2 and NiS/Ni3S2@NiWO4 at 2 mA cm−2. (e) GCD curves of NiS/Ni3S2@NiWO4 at different current densities. (f) IR drop vs. current density for NiS/Ni3S2@NiWO4. (g) Areal capacity of NiWO4, NiS/Ni3S2 and NiS/Ni3S2@NiWO4 at different current densities. (h) Nyquist plots of the EIS for NiWO4, NiS/Ni3S2 and NiS/Ni3S2@NiWO4.

  • Figure 5

    (a) Schematic illustration of the hybrid SC fabricated with NiS/Ni3S2@NiWO4/Ni and AC/Ni. (b) CV curves of the NiS/Ni3S2@NiWO4/Ni-based hybrid SC measured at different operating voltages at 10 mV s−1. (c) CV curves of the NiS/Ni3S2@NiWO4/Ni-based hybrid SC from 5 to 50 mV s−1. (d) GCD curves of the hybrid SC from 5 to 50 mA cm−2. (e) Specific capacities and Coulombic efficiencies at different current densities for the hybrid SC. (f) Ragone plot of our work compared with the reported nickel-based hybrid SCs.

  • Figure 6

    (a) Cycle stability test and Coulombic efficiency of the hybrid SC for 10,000 cycles at 20 mA cm−2. (b) Schematic illustration of the two-electrode all-solid-state hybrid SC. (c) Digital photos of eight red LEDs in parallel lighted up by assembling three hybrid SC devices in series.