Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 122, Issue 2, Pages 780-787Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.7b06728
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Funding
- Ministry of Education and Science of the Russian Federation [RFME-FI61614X5060007]
- Bundesministerium fur Bildung und Forschung through joint Russian German research project Synchrotron and Neutron Studies for Energy Storage (SYNESTESia) [05K14EWA]
- German Federal Ministry of Education and Science (BMBF) [03SF0523A, 033RC004E]
- DAAD [57218279]
- [104-2112-M-032-005-MY2]
- [105-2911-I-032-501]
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The electrodeposition nature of copper on a gold electrode in a 4.8 pH CuSO4 solution was inquired using X-ray absorption spectroscopy, electro-chemical quartz crystal microbalance, and thermal desorption spectroscopy techniques. Our results point out that the electrodeposition of copper prompts the formation of stable oxi-hydroxide species with a formal oxidation state Cu+ without the evidence of metallic copper formation (Cu). Moreover, the subsequent anodic polarization of Cu2Oaq yields the formation of CuO, in the formal oxidation state Cu2+, which is dissolved at higher anodic potential. It was found that the dissolution process needs less charge than that required for the electrodeposition indicating a nonreversible process most likely due to concomitant water splitting and formation of protons during the electrodeposition.
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