O2 reduction can occur via 1e−, 2e−, and 4e− pathways to yield O2−, H2O2, and H2O, respectively. Experimentally, it is often difficult to distinguish between the 1e− and 2e− pathways because O2− rapidly disproportionates in acidic and neutral aqueous solutions to H2O2 and O2. In this manuscript, we combine a mathematical model with previous experimental results with O2 reduction electrocatalysts on lipid-modified electrodes. The model demonstrates that for a typical O2 reduction catalyst, the individual rate constants for the 1e−, 2e−, and 4e− pathways can be determined within a fairly narrow range with O2 reduction current and H2O2 production rates as the only experimental inputs. This model will aid electrochemists in assessing the mechanism and selectivity of O2 reduction catalysts.

中文翻译：

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脂质修饰电极电催化氧还原产物的动力学建模

O2 还原可以通过 1e-、2e- 和 4e- 途径发生，分别产生 O2-、H2O2 和 H2O。实验上，通常很难区分 1e- 和 2e- 途径，因为 O2- 在酸性和中性水溶液中迅速歧化为 H2O2 和 O2。在这份手稿中，我们将数学模型与先前的实验结果与脂质修饰电极上的 O2 还原电催化剂相结合。该模型表明，对于典型的 O2 还原催化剂，1e-、2e- 和 4e- 路径的各个速率常数可以在相当窄的范围内确定，O2 还原电流和 H2O2 生产率作为唯一的实验输入。该模型将帮助电化学家评估 O2 还原催化剂的机理和选择性。