Next Article in Journal
Quantifying the Predictability and Efficiency of the Cointegrated Ethanol and Agricultural Commodities Price Series
Previous Article in Journal
Semantic Network Analysis Pipeline—Interactive Text Mining Framework for Exploration of Semantic Flows in Large Corpus of Text
Open AccessArticle

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

1
Center for Physical Sciences and Technology, Saulėtekio ave. 3, LT-10257 Vilnius, Lithuania
2
Nanotechnology Facility, Swinburne University of Technology, John st., Hawthorn 3122 Vic, Australia
3
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)
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 O + ) 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 O + ) ad and (H 2 + ) ad or (D 3 O + ) 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 nanostructured CuO; Pd electrode; hydrogen evolution; SERS
Show Figures

Figure 1

MDPI and ACS 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. Appl. Sci. 2019, 9, 5301.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop