We demonstrated the activation energy approach to evaluate oxygen evolution performance and to probe active site reconstruction at different potentials. Activation energies are acquired following the Arrhenius equation by monitoring the current densities under varied hydroxide concentrations and temperatures. Our complex oxide electrocatalysts (Ag- and Ce-bidoped iron manganese oxyhydroxide) exhibit a much smaller activation energy of 19.12 kJ mol^–1 in comparison to FeMnOH (60.01 kJ mol^–1) at 1.7 V. The higher numbers of doped metal cations show smaller activation energy values corresponding to the higher activities, yet site reconstruction is less likely to occur. Through operando Raman studies, site reconstruction may not be absolutely required to reach a high-performance OER, in contrast to the general recognition. By knowing the potential-dependent activation energy, a quantitative OER activity comparison among reconstructed sites is possible. A substrate with a low background current is useful to experimentally acquire iR-corrected activation energies over a wide potential window.

中文翻译：

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活化能评估电位相关活动和氧气演化的场地重建

我们展示了活化能方法来评估析氧性能并探索不同电位下的活性位点重建。通过监测不同氢氧化物浓度和温度下的电流密度，按照 Arrhenius 方程获得活化能。我们的复合氧化物电催化剂（Ag-和 Ce-双掺杂的铁锰氢氧化物）在 1.7 V 下与 FeMnOH（60.01 kJ mol ^-1）相比，在 1.7 V 下的活化能要小得多，为 19.12 kJ mol ^-1 。较小的活化能值对应于较高的活动，但站点重建不太可能发生。通过操作数拉曼研究表明，与普遍认可的情况相反，站点重建可能不是绝对需要达到高性能 OER 的。通过了解与电位相关的活化能，可以对重建位点之间的 OER 活性进行定量比较。具有低背景电流的底物可用于在较宽的电位窗口上通过实验获得iR校正的活化能。