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SCIENCE CHINA Materials, Volume 64 , Issue 8 : 1997-2007(2021) https://doi.org/10.1007/s40843-020-1602-5

Photogated proton conductivity of ZIF-8 membranes co-modified with graphene quantum dots and polystyrene sulfonate

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  • ReceivedNov 3, 2020
  • AcceptedDec 31, 2020
  • PublishedMar 1, 2021

Abstract


Funded by

the National Natural Science Foundations of China(21875212)

the Key Program of National Natural Science and Foundation(51632008)

the Major R&D Plan of Zhejiang Natural Science Foundation(LD18E020001)

the National Key Research and Development Program(2016YFA0200204)

the Fundamental Research Funds for the Central Universities.


Acknowledgment

This work was supported by the National Natural Science Foundation of China (21875212), the Key Program of National Natural Science Foundation (51632008), the Major R&D Plan of Zhejiang Natural Science Foundation (LD18E020001), the National Key Research and Development Program (2016YFA0200204) and the Fundamental Research Funds for the Central Universities.


Interest statement

The authors declare that they have no conflict of interest.


Contributions statement

Peng X supervised the project; Fan S performed the experiments, analyzed the results and wrote the manuscript; Wang S, Hussain S and Li Z assisted in the device fabrication and measurement; Ma X, Wang X and Wan X contributed to the theoretical and data analyses. All authors contributed to the general discussion.


Author information

Shuaikang Fan received his Bachelor degree (2019) from the College of Materials Science and Engineering at Sichuan University. He is currently pursuing his Master degree at the School of Materials Science and Engineering at Zhejiang University under the supervision of Prof. Xinsheng Peng. His present research interests mainly focus on the design and syntheses of proton conductive MOF membranes for energy conversion devices.


Xinsheng Peng received his PhD degree in 2003 at the Institute of Solid State Physics, Chinese Academy of Sciences. He became a full professor at the School of Materials Science and Engineering at Zhejiang University in 2010. His research interests mainly focus on the design and syntheses of functional membranes and controlled mass transportation in energy and environmental science.


Supplement

Supplementary information

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


References

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  • Figure 1

    (a) SEM image of the ZHNs. (b) Surface and (c) cross-sectional SEM images of the ZIF-8 membrane. (d) SEM image of 2GQD-PSS@ZHNs. (e) Surface and (f) cross-sectional SEM images of 2GQDs-PSS@ZIF-8 membrane. (g) TEM image of the 2GQDs-PSS@ZIF-8 membrane. (h) S (green) and Zn (blue) EDS mapping images of the zone marked in (f). (i) XRD patterns of the ZIF-8, PSS@ZIF-8 and 2GQDs-PSS@ZIF-8 membranes.

  • Scheme 1

    Illustration of the synthesis process of GQDs-PSS@ZIF-8 membrane.

  • Scheme 2

    Illustration of the proton transport mechanism through the photothermal effect of GQDs in the GQDs-PSS@ZIF-8 membranes.

  • Figure 2

    (a) FTIR and (b) UV-vis absorption spectra of the samples. (c) PL spectra of the membranes excited at 325 nm.

  • Figure 3

    (a) Proton conductivities of ZIF-8, PSS@ZIF-8 and GQDs-PSS@ZIF-8 with different GQD contents at 55°C and 95% RH. (b) Proton conductivities of 2GQDs-PSS@ZIF-8 at different temperatures and 95% RH. (c) Nyquist plots of 2GQDs-PSS@ZIF-8 corresponding to (b). (d) Proton conductivities of 2GQDs-PSS@ZIF-8 at different humidities and 55°C.

  • Figure 4

    (a) Arrhenius plots and corresponding activation energies of ZIF-8, PSS@ZIF-8 and 2GQDs-PSS@ZIF-8 at 95% RH. (b) Proton conductivities of 2GQDs-PSS@ZIF-8 with the light off (blue region) and on (yellow region) at 55°C and 95% RH. (c) Corresponding Nyquist plots of (b). (d) ON/OFF ratios of the ZIF-8, PSS@ZIF-8 and GQDs-PSS@ZIF-8 membranes with different GQD contents at 55°C and 95% RH. Infrared camera photographs of 2GQDs-PSS@ZIF-8 (e) before and (f) after exposure to the Xenon lamp for 10 min at an optical power density of 100 mW cm−2.

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