Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 3, Issue 20, Pages 2948-2951Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz301476w
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Funding
- Department of Energy, Basic Energy Sciences through the SUNCAT Center for Interface Science and Catalysis
- UTRC
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Understanding trends in selectivity is of paramount importance for multi-electron electrochemical reactions. The goal of this work is to address the issue of 2e(-) versus 4e(-) reduction of oxygen on metal surfaces. Using a detailed thermodynamic analysis based on density functional theory calculations, we show that to a first approximation an activity descriptor, Delta G(OH*), the free energy of adsorbed OH*, can be used to describe trends for the 2e(-) and 4e(-) reduction of oxygen. While the weak binding of OOH* on Au(111) makes it an unsuitable catalyst for the 4e(-) reduction, this weak binding is optimal for the 2e(-) reduction to H2O2. We find quite a remarkable agreement between the predictions of the model and experimental results spanning nearly 30 years.
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