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SCIENCE CHINA Chemistry
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SCIENCE CHINA Chemistry, Volume 63 , Issue 2 : 198-202(2020) https://doi.org/10.1007/s11426-019-9635-2

Fluorescence detection of hydroxyl radical generated from oxygen reduction on Fe/N/C catalyst

Li-Na Chen 1, Wen-Song Yu 1, Tao Wang 1, Xiao-Dong Yang 2, Hui-Juan Yang 3, Zhi-Xin Chen 1, Tan Wang 1, Na Tian 1, Zhi-You Zhou 1,*, Shi-Gang Sun 1
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  • ReceivedAug 19, 2019
  • AcceptedOct 10, 2019
  • PublishedNov 27, 2019
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Abstract


Funded by

the National Key Research and Development Program of China(2017YFA0206500)

and the National Natural Science Foundation of China(21603103,21875194,21902125,91645121)


Acknowledgment

This work was supported by the National Key Research and Development Program of China (2017YFA0206500), and the National Natural Science Foundation of China (21603103, 21875194, 21902125, 91645121).


Interest statement

The authors declare that they have no conflict of interest.


Supplement

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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  • Click to view Download high-quality image

    Scheme 1

    Schematic illustration of the conversion from non-fluorescent coumarin to fluorescent 7-hydroxyl-coumarin by •OH generated in ORR on Fe/N/C catalyst (color online).

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    Figure 1

    (a) I-t curve of ORR on Fe/N/C at 0.65 V in O2-saturated 0.1 M H2SO4 solution with and without addition of 0.5 mM coumarin. The red arrow denotes the addition of coumarin into the solution. (b) Fluorescence emission spectra of the solution with coumarin collected at different ORR times (0–6 h). The emission at 472 nm indicates the presence of •OH (color online).

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    Figure 2

    Control experiments for the detection of •OH generated from ORR on the Fe/N/C catalyst. The fluorescence emission spectra of five samples were tested: normal ORR at 0.65 V; Ar-saturated solution at 0.65 V; electrolyte in counter electrode compartment; O2-saturated solution without applying potential (i.e., without ORR), and mixing with 35 μM H2O2 (color online).

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    Figure 3

    (a) Fluorescence emission spectra of the solution with coumarin collected from ORR at different potentials. The time for ORR was 6 h. (b) Fluorescence emission spectra of the solution with 3 μM 7-hydroxyl coumarin collected from ORR at different potentials for 2 h (color online).

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    Figure 4

    (a) ORR polarization curves and ring current of Fe/N/C catalyst in O2-saturated 0.1 M H2SO4 solution. The ring current comes from H2O2 oxidation. (b) Comparison of the ring currents from H2O2 oxidation with the fluorescence intensity induced by •OH (color online).