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• W2158136097 endingPage "2464" @default.
• W2158136097 startingPage "2452" @default.
• W2158136097 abstract "Oxidative degradation of copper in aqueous environments is a major concern in areas such as catalysis, electronics and construction engineering. A particular challenge is to systematically investigate the details of this process for non-ideal copper surfaces and particles under the conditions found in most real applications. To this end, we have used hybrid density functional theory to study the oxidation of a Cu7 cluster in water solution. Especially, the role of a large water coverage is explored. This has resulted in the conclusion that, under atmospheric H2 pressures, the thermodynamically most favored state of degradation is achieved upon the generation of four H2 molecules (i.e. Cu7 + 8H2O → Cu7(OH)8 + 4H2) in both condensed and gas phases. This state corresponds to an average oxidation state below Cu(I). The calculations suggest that the oxidation reaction is slow at ambient temperatures with the water dissociation as the rate-limiting step. Our findings are expected to have implication for, among other areas, the copper catalyzed water-gas shift reaction, and for the general understanding of copper corrosion in aqueous environments." @default.
• W2158136097 created "2016-06-24" @default.
• W2158136097 creator A5017613238 @default.
• W2158136097 creator A5036960935 @default.
• W2158136097 creator A5062559050 @default.
• W2158136097 date "2014-01-01" @default.
• W2158136097 modified "2023-10-14" @default.
• W2158136097 title "Searching for the thermodynamic limit – a DFT study of the step-wise water oxidation of the bipyramidal Cu₇cluster" @default.
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