The electrocatalytic behavior of "inactive" (Boron Doped Diamond (BDD), SnO₂-Sb and PbO₂) anodes toward the oxygen evolution reaction (OER) is evaluated using dc and ac techniques, under controlled experimental conditions (e.g. air bubbling, ohmic drop correction). Tafel slopes estimated from anodic polarization curves for all catalysts are located above 100 mV dec^–1, suggesting that the rate-controlling step is similar for these materials at determined overpotentials. In agreement with the literature, it could be associated with the ^•OH generation since "active catalysts" displays slopes below 80 mV dec^–1. A transfer function model is derived to account for the kinetic parameters of the OER mechanism for each anode, throughout its fitting to experimental electrochemical impedance spectroscopy (EIS) spectra. The model considers the kinetics of each elementary reaction and the material balances for the rates of formation of the adsorbates (H₂O_ads, ^•OH_ads, ^•O_ads, ^•OOH_ads, and O_2ads) involved in the OER. It is found that the rate-controlling step on SnO₂-Sb (≤2.14 V), PbO₂ (≤1.74 V) and BDD (2.54–2.71 V) is associated with the ^•OH formation, while this control is only modified when the potential becomes more positive for the oxide catalysts, thus, being determined by the production of adsorbed oxygen O_2ads which on its turn promotes the O₂ evolution. On the other hand, the rate-control step remains similar for BDD over the entire analyzed potential range, standing out its unique properties as inactive catalyst of the OER.

中文翻译：

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通过EIS传递函数在非活性阳极上进行的析氧反应（OER）的动力学参数：* OH的形成

在控制的实验条件下（例如鼓泡，欧姆），使用直流电和交流电技术评估了“惰性”阳极（硼掺杂的金刚石（BDD），SnO ₂ -Sb和PbO ₂）对氧气析出反应（OER）的电催化行为。掉落校正）。根据阳极极化曲线估算的所有催化剂的塔菲尔斜率位于100 mV dec ^-1以上，这表明在确定的超电势下，这些材料的速率控制步骤相似。与文献一致，它可能与^• OH的产生有关，因为“活性催化剂”显示的斜率低于80 mV dec ^–1。导出一个传递函数模型，以说明每个阳极的OER机制的动力学参数，并贯穿其与实验电化学阻抗谱（EIS）光谱的拟合。该模型考虑每个基本反应的用于形成吸附物的速率的动力学和物料平衡（H ₂ ö_广告，^• OH_广告，^• ö_广告，^• OOH_广告，和O _2ads）参与OER。发现SnO ₂ -Sb（≤2.14V），PbO ₂（≤1.74V）和BDD（2.54–2.71 V）上的速率控制步骤与^•OH的形成，尽管仅当氧化物催化剂的电势变得更正时才修改此控制，因此，这取决于吸附的氧气O _2ads的产生，而氧气本身又促进了O _2的释放。另一方面，在整个分析电位范围内，BDD的速率控制步骤仍然相似，突出了其作为OER惰性催化剂的独特性能。