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Concentrated hydrogel electrolyte for integrated supercapacitor with high capacitance at subzero temperature

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  • ReceivedNov 22, 2020
  • AcceptedJan 29, 2021
  • PublishedMar 29, 2021

Abstract


Funding

Major Science and Technology Projects of Heilongjiang Province(2019ZX09A01)

the National Key Technology R&D Program(2017YFB1401805)


Acknowledgment

This work was supported by the Major Science and Technology Projects of Heilongjiang Province (2019ZX09A01) and the National Key Technology R&D Program (2017YFB1401805).


Interest statement

The authors declare no conflict of interest.


Supplementary data

The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.


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  • Figure 1

    (a) Tensile stress-strain curves of PVA and f-PVA; (b) tensile stress-strain curves of f-PVA1, f-PVA2, and f-PVA3 hydrogels; (c) flexibility of f-PVA, f-PVA1, f-PVA2, and f-PVA3 at RT, −40 °C, and bending state at −40 °C; (d) mechanical properties of f-PVA3 after freezing at −40 °C for 24 h (color online).

  • Figure 2

    (a) DSC for f-PVA3; (b) temperature-dependent ionic conductivity (the inset shows f-PVA3 gel serves as a conductor to connect an LED circuit); (c, d) relationship between Z′ and ω−1/2 (color online).

  • Figure 3

    SEM images of PANi-f-PVA3 (a) surface and (b) cross-section. (c) FT-IR spectra. Electrochemical performance: (d) CV curves at a scan rate of 1 mV s−1 at RT; (e) CV curves of PANi-f-PVA3 at 1 mV s−1 at different temperatures; (f) CV curves at a sweep rate of 50 mV s−1 at −40 °C. (g) Rate performance of PANi-f-PVA3 at different temperatures. (h) Ragone plots. (i) Nyquist plots (color online).

  • Figure 4

    (a) b-values against the voltage at −40 °C; (b) capacitive contribution at −40 °C under different sweep rates; (c) capacitive contribution at −40 °C; (d) capacitive contribution at RT; (e) q−1 vs. v1/2; (f) q vs. v−1/2 (color online).

  • Figure 5

    (a) CV curves at 30 mV s−1 after bending multiple times; (b) CV curves at 50 mV s−1 under different bending angles; (c) CV curves at 30 mV s−1 before and after hammered; (d) cycle stability (inset is a digital graphe of LED powered by four units devise) (color online).

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