The importance of the shape of Cu2O nanocrystals on plasmon-enhanced oxygen evolution reaction in alkaline media

Nait Saada, Tamazouzt;Pang, Liuqing;Sravan Kumar, Kilaparthi;H.B. Dourado, André;Szunerits, Sabine;et.al.
(2021) Electrochimica Acta — Vol. 390, p. 138810 (2021)

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Authors
  • Nait Saada, TamazouztUniv. Lille, CNRS, Centrale Lille Univ. Polytechnique Hauts-de-France, UMR 8520 - IEMN, F-590 0 0 Lille, France
    Author
  • Pang, LiuqingUniv. Lille, CNRS, Centrale Lille Univ. Polytechnique Hauts-de-France, UMR 8520 - IEMN, F-590 0 0 Lille, France
    Author
  • Sravan Kumar, KilaparthiUniv. Lille, CNRS, Centrale Lille Univ. Polytechnique Hauts-de-France, UMR 8520 - IEMN, F-590 0 0 Lille, France
    Author
  • H.B. Dourado, AndréDepartamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, 05508-0 0 0 São Paulo, SP, Brazil
    Author
  • Paul, SébastienUCLouvain
    Author
  • Melinte, SorinUCLouvain
    Author
  • Sandu, Georgianaorcid-logoUCLouvain
    Author
  • Petretto, GuidoUCLouvain
    Author
  • Rignanese, Gian-Marcoorcid-logoUCLouvain
    Author
  • Szunerits, SabineUniv. Lille, CNRS, Centrale Lille Univ. Polytechnique Hauts-de-France, UMR 8520 - IEMN, F-590 0 0 Lille, France
    Author
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Abstract
Cu2O nanostructures of cubic or octahedral shape as well as decorated with gold nanoparticles were synthesized by a chemical process. The electrochemical activity of these nanostructures for the oxygen evolution reaction (OER) in alkaline media was assessed in the dark and under solar light irradiation. Electrodes modified with cubic-shaped Cu2O and Cu2O-Au nanostructures revealed both enhanced elec- trocatalytic OER activity over the octahedral-shaped ones, for which hydroxylation of the (111) surfaces might hinder the OER as supported by numerical computations. Illumination of Cu2O nanostructures with solar light did not enhance the electrocatalytic OER. Cu2O-Au nanostructures, however, showed improved OER activity with an overpotential of 200 mV (10 mA cm −2 ) and a Tafel slope of 97 mV dec −1 . The enhanced OER activity was ascribed to increased light absorption due to the plasmonic properties of Cu2O-Au cubes.
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Nait Saada, T., Pang, L., Sravan Kumar, K., H.B. Dourado, A., D. Germano, L., D. Vicentini, E., P.L. Batista, A., G.S. de Oliveira-Filho, A., Dumeignil, F., Paul, S., Wojcieszak, R., Melinte, S., Sandu, G., Petretto, G., Rignanese, G.-M., Henrique Braga, A., F. Rosado, T., Meziane, D., Boukherroub, R., et al. (2021). The importance of the shape of Cu2O nanocrystals on plasmon-enhanced oxygen evolution reaction in alkaline media. Electrochimica Acta, 390, 138810. https://doi.org/10.1016/j.electacta.2021.138810 (Original work published 2021)