Hydrogen Evolution on Nano-StructuredCuO/Pd Electrode: Raman Scattering Study

Department of Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan

⁴

Institute of Advanced Sciences, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan

⁵

Melbourne Center for Nanofabrication, Australian National Fabrication Facility, Clayton, Melbourne 3168, Australia

Authors to whom correspondence should be addressed.

Appl. Sci. 2019, 9(24), 5301; https://doi.org/10.3390/app9245301

Received: 3 November 2019 / Revised: 23 November 2019 / Accepted: 30 November 2019 / Published: 5 December 2019

(This article belongs to the Section Nanotechnology and Applied Nanosciences)

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Abstract

In this study, the processes taking place on the surfaces of nanostructured Cu/CuO and Cu/CuO/Pd electrodes at different potential, E, values in the solutions of 0.1 M KOH in H

_{2}

O and D

_{2}

O (heavy water) were probed by surface enhanced Raman spectroscopy (SERS), and the analysis of electrochemical reactions occurring under experimental conditions is presented. The bands of the SERS spectra of the Cu/CuO/Pd electrode observed in the range of E values from +0.3 V to 0 V (standard hydrogen electrode (SHE)) at 1328–1569 cm

^{- 1}

are consistent with the existence of species that are adsorbed or weakly bound to the surface with the energy of interaction close to 15–21 kJ mol

^{- 1}

. These bands can be attributed to the ad(ab)sorbed (H

_{3}

^{+}

)

_{ad}

, (H

_{2}^{+}

)

_{ab}

, and (H

_{2}^{+}

)

_{ad}

ions as intermediates in reversible hydrogen evolution and oxidation reactions (HER/HOR) taking place on the Cu/CuO/Pd electrode. There was no isotopic effect observed; this is consistent with the dipole nature of the electron-ion pair formation of adsorbed (H

_{3}

^{+}

)

_{ad}

and (H

_{2}^{+}

)

_{ad}

or (D

_{3}

^{+}

)

_{ad}

and (D

_{2}^{+}

)

_{ad}

. In accordance with the literature data, SERS bands at 125–146 cm

^{- 1}

and ∼520–565 cm

^{- 1}

were assigned to Cu(I) and Cu(II) oxygen species. These findings corroborate the quantitative stepwise mechanism of water reduction. View Full-Text

Keywords: nanostructured CuO; Pd electrode; hydrogen evolution; SERS

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Juodkazytė, J.; Juodkazis, K.; Matulaitienė, I.; Šebeka, B.; Savickaja, I.; Balčytis, A.; Nishijima, Y.; Niaura, G.; Juodkazis, S. Hydrogen Evolution on Nano-StructuredCuO/Pd Electrode: Raman Scattering Study. Appl. Sci. 2019, 9, 5301. https://doi.org/10.3390/app9245301

AMA Style

Juodkazytė J, Juodkazis K, Matulaitienė I, Šebeka B, Savickaja I, Balčytis A, Nishijima Y, Niaura G, Juodkazis S. Hydrogen Evolution on Nano-StructuredCuO/Pd Electrode: Raman Scattering Study. Applied Sciences. 2019; 9(24):5301. https://doi.org/10.3390/app9245301

Chicago/Turabian Style

Juodkazytė, Jurga, Kȩstutis Juodkazis, Ieva Matulaitienė, Benjaminas Šebeka, Irena Savickaja, Armandas Balčytis, Yoshiaki Nishijima, Gediminas Niaura, and Saulius Juodkazis. 2019. "Hydrogen Evolution on Nano-StructuredCuO/Pd Electrode: Raman Scattering Study" Applied Sciences 9, no. 24: 5301. https://doi.org/10.3390/app9245301

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Hydrogen Evolution on Nano-StructuredCuO/Pd Electrode: Raman Scattering Study

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