She, Sixuan Yu, Jie Tang, Wanqi Zhu, Yinlong Chen, Yubo Sunarso, Jaka Zhou, Wei Shao, Zongping Systematic Study of Oxygen Evolution Activity and Stability on La<sub>1–<i>x</i></sub>Sr<sub><i>x</i></sub>FeO<sub>3−δ</sub> Perovskite Electrocatalysts in Alkaline Media Perovskite oxide is an attractive low-cost alternative catalyst for oxygen evolution reaction (OER) relative to the precious metal oxide-based electrocatalysts (IrO<sub>2</sub> and RuO<sub>2</sub>). In this work, a series of Sr-doped La-based perovskite oxide catalysts with compositions of La<sub>1–<i>x</i></sub>Sr<sub><i>x</i></sub>FeO<sub>3−δ</sub> (<i>x</i> = 0, 0.2, 0.5, 0.8, and 1) are synthesized and characterized. The OER-specific activities in alkaline solution increase in the order of LaFeO<sub>3−δ</sub> (LF), La<sub>0.8</sub>Sr<sub>0.2</sub>FeO<sub>3−δ</sub> (LSF-0.2), La<sub>0.5</sub>Sr<sub>0.5</sub>FeO<sub>3−δ</sub> (LSF-0.5), SrFeO<sub>3−δ</sub> (SF), and La<sub>0.2</sub>Sr<sub>0.8</sub>FeO<sub>3−δ</sub> (LSF-0.8). We establish a direct correlation between the enhancement in the specific activity and the amount of surface oxygen vacancies as well as the surface Fe oxidation states. The improved specific activity for LSF-0.8 is clearly linked to the optimum amount of surface oxygen vacancies and surface Fe oxidation states. We also find that the OER performance stability is a function of the crystal structure and the deviation in the surface La and/or Sr composition(s) from their bulk stoichiometric compositions. The cubic structure and lower deviation, as is the case for LSF-0.8, led to a higher OER performance stability. These surface performance relations provide a promising guideline for constructing efficient water oxidation. surface Fe oxidation states;surface oxygen vacancies;RuO 2;metal oxide-based electrocatalysts;Alkaline Media Perovskite oxide;solution increase;water oxidation;Oxygen Evolution Activity;OER-specific activities;alternative catalyst;oxygen evolution reaction;Sr-doped La-based perovskite oxide catalysts;FeO;LSF -0.8;bulk stoichiometric compositions;OER performance stability;surface La;IrO 2;crystal structure;Systematic Study;LF;surface performance relations 2018-03-16
    https://acs.figshare.com/articles/journal_contribution/Systematic_Study_of_Oxygen_Evolution_Activity_and_Stability_on_La_sub_1_i_x_i_sub_Sr_sub_i_x_i_sub_FeO_sub_3_sub_Perovskite_Electrocatalysts_in_Alkaline_Media/6061682
10.1021/acsami.8b00682.s001