Abstract
A novel kind of self-assembled graphene quantum dots-Co3O4 (GQDs-Co3O4) nanocomposite was successfully manufactured through a hydrothermal approach and used as an extremely effectual oxygen evolution reaction (OER) electrocatalyst. The characterization of morphology with scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that Co3O4 nanosheets combined with graphene quantum dots (GQDs) had a new type of hexagonal lamellar self-assembly structure. The GQDs-Co3O4 electrocatalyst showed enhanced electrochemical catalytic properties in an alkaline solution. The start potential of the OER was 0.543 V (vs SCE) in 1 M KOH solution, and 0.577 V (vs SCE) in 0.1 M KOH solution correspondingly. The current density of 10 mA cm−2 had been attained at the overpotential of 321 mV in 1 M KOH solution and 450 mV in 0.1 M KOH solution. Furthermore, the current density can reach 171 mA cm−2 in 1 M KOH solution and 21.4 mA cm−2 in 0.1 M KOH solution at 0.8 V. Moreover, the GQDs-Co3O4 nanocomposite also maintained an ideal constancy in an alkaline solution with only a small deterioration of the activity (7%) compared with the original value after repeating potential cycling for 1000 cycles.
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Acknowledgements
This work was funded by Gansu Province Science and Technology Plan Projects, China (Grant No. 22CX8GA137), Northwest Normal University Research Project, China (Grant No. NWNU-LKQN2022-07) and Science and Technology Program of Gansu Province (20YF3GA022), China.
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Guo, R., Fang, M., Chen, Q. et al. Self-assembled graphene quantum dots-Co3O4 nanocomposite for highly efficient oxygen evolution reaction electrocatalyst. Carbon Lett. 33, 1591–1600 (2023). https://doi.org/10.1007/s42823-023-00533-z
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DOI: https://doi.org/10.1007/s42823-023-00533-z