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Electrochemical hydrogen-storage capacity of graphene can achieve a carbon-hydrogen atomic ratio of 1:1

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  • ReceivedAug 6, 2021
  • AcceptedSep 25, 2021
  • PublishedOct 14, 2021

Abstract


Acknowledgment

The financial support from the National Natural Science Foundation of China (21827802, 22021001), and the 111 Project (B08027, B17027) are appreciated.


Interest statement

The authors declare no conflict of interest.


Supplementary data

Supporting information

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) Cyclic voltammetric behaviors of the activation of SLG/Pt electrode in 0.5 M H2SO4 aqueous solution with a scan rate of 200 mV/s. The inset is the first-cycle voltammogram. (b) Cyclic voltammograms of the activated SLG/Pt electrode in 0.5 M H2SO4 aqueous solution with a series of scan rates: 2, 5, 10, 20, 50, 100, 200 mV/s. The inset shows the linear relationship between the Had-stripping peak current and the square root of the scan rate when the latter is faster than 20 mV/s (color online).

  • Figure 2

    Chronoamperometry of the activated SLG/Pt electrode in 0.5 M H2SO4 aqueous solution. The electrode potential was held at 0.75 V (vs. Pt) for 0, 0.1, 0.5, 1, 2, 5, 7, 10, 12, 15, 17, 20 and 30 s, and then stepped to 0.11 V. Inset: the integral charge vs. the square root of the pre-depositing time (color online).

  • Figure 3

    (a) XPS C 1s spectra of the SLG/Pt before (blue line) and after (red line) pre-depositing Had on SLG. (b, c) The deconvoluted XPS spectra obtained on the SLG/Pt electrode before and after pre-depositing Had on SLG, respectively (color online).

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