Electrodeposited p-Cu2O Films – Role of Redox-Active Compounds Under Photoelectrochemical Operation Revisited
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43933583" target="_blank" >RIV/60461373:22310/25:43933583 - isvavai.cz</a>
Result on the web
<a href="https://chemistry-europe.onlinelibrary.wiley.com/doi/pdf/10.1002/elsa.70003?getft_integrator=clarivate&utm_source=clarivate" target="_blank" >https://chemistry-europe.onlinelibrary.wiley.com/doi/pdf/10.1002/elsa.70003?getft_integrator=clarivate&utm_source=clarivate</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/elsa.70003" target="_blank" >10.1002/elsa.70003</a>
Alternative languages
Result language
angličtina
Original language name
Electrodeposited p-Cu2O Films – Role of Redox-Active Compounds Under Photoelectrochemical Operation Revisited
Original language description
The p-type semiconducting copper oxides CuO and Cu<inf>2</inf>O are of interest for the conversion of solar energy due to their medium-wide bandgap and the position of their conduction band, allowing for reductive processes in junctions with electrolytes under irradiation. In this work, on Cu<inf>2</inf>O, the efficiency of several such processes in competition with self-reduction is critically reviewed and experimentally studied. Up to 2000 nm thick films were obtained via potentiostatic electrodeposition on fluorine-doped tin oxide on glass from alkaline solutions of CuSO<inf>4</inf> using lactic acid as a complexant. The films consisted of a dense arrangement of crystallites as seen by scanning electron microscopy and were of phase pure Cu<inf>2</inf>O as shown by X-ray diffraction (XRD). The films were specular, with an absorption coefficient of 50,000 cm−1 at 480 nm and a direct bandgap of 2.5 eV. In junctions with aqueous electrolytes, the material was found to be p-type. Under electrical bias, cathodic and photocathodic currents passed and increased dramatically when reducible redox compounds were added. The influence of various redox couples (O<inf>2</inf>, H<inf>2</inf>O<inf>2</inf>, and methylviologen [MV, 1,1'-dimethyl-4,4'-bipyridinium]) and their concentration in the electrolyte on the stability of the electrodes was studied. Long-time experiments showed that to avoid degradation of the electrodes, the use of oxygen-saturated solutions was mandatory when no other redox couple was added. H<inf>2</inf>O<inf>2</inf>-containing electrolytes gave rise to constant photocurrents and no alteration of the electrodes was found by XRD. MV yielded cathodic photocurrents. Reoxidation of its reduced form by dissolved oxygen was necessary in order to hinder dimerization or further reduction to MV0 and association of the latter to MV0<inf>n</inf>, producing a whitish layer on top of the electrodes which led to their inactivation. © 2025 The Author(s). Electrochemical Science Advances published by Wiley-VCH GmbH.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Result continuities
Project
<a href="/en/project/EH22_008%2F0004617" target="_blank" >EH22_008/0004617: Energy conversion and storage</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Electrochemical Science Advances
ISSN
2698-5977
e-ISSN
2698-5977
Volume of the periodical
5
Issue of the periodical within the volume
2
Country of publishing house
DE - GERMANY
Number of pages
8
Pages from-to
nestránkováno
UT code for WoS article
001442463700001
EID of the result in the Scopus database
2-s2.0-105002571648