NDLI: Formation of cuprous oxide layers in Cu(II) solutions containing gluconic acid

Content Provider	Springer Nature Link
Author	Survila, Arvydas Pileckienė, Jolanta Kanapeckaitė, Stasė Kalinauskas, Putinas Stalnionis, Giedrius
Copyright Year	2011
Abstract	In accordance with thermodynamic analysis, cuprous oxide layers are formed spontaneously in the Cu\|Cu(II), gluconic acid system at pH > 3.7 under open-circuit conditions. A current peak of Cu2O reduction is observed on cathodic voltammograms at ca −0.7 V, its height being dependent on the exposure time. The analysis of the charge transferred in this region yields the rate of Cu2O formation equal to 1.25 × 10−10 mol cm−2 s−1. The light perturbation of Cu electrode under open-circuit conditions results in the generation of a negative photopotential, which is indicative of n-type conductivity. The threshold wavelength is equal to ∼590 nm and is consistent with a band gap of ∼2.1 eV. Anodic photocurrents, which are observed near the open-circuit potential, decrease with cathodic polarization and change their sign at ∼0.05 V. Analysis of impedance data was performed, invoking the equivalent circuit that accounts for the two-step charge transfer. In the presence of Cu2O, some retardation of Cu(II) reduction was found to occur with a slight increase in the admittance of the double layer. The suggestion has been made that oxide layers formed in Cu(II) gluconate solutions cannot be compact and uniformly distributed over the entire electrode surface. Relevant investigations of surface morphology support this conclusion.
Starting Page	521
Ending Page	527
Page Count	7
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	16
Issue Number	2
e-ISSN	14330768
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-04-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cuprous oxide Gluconic acid Photoresponse Impedance Energy Storage Physical Chemistry Analytical Chemistry Condensed Matter Physics Characterization and Evaluation of Materials Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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