Co and Ni codoped strontium ferrite particles were prepared by a solid-state strategy and employed as catalysts for the OER. They exhibited a Tafel slope of 55 mV dec⁻¹ and required an overpotential of 334 mV to afford a current density of 10 mA cm⁻², which is lower than that of Co and Ni separately doped samples. The DFT calculations reveal the redistribution of local charge around Fe atoms, decrease of energy barriers, and increase of conductivity by doping. This work unveils the effect of codoping on the activities of Fe-based perovskite oxide for the OER, providing a strategy to engineer other perovskite-based materials for catalysis.

中文翻译：

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揭示铁氧体锶中的共掺杂对碱性介质中析氧的影响


通过固态策略制备了 Co 和 Ni 共掺杂的锶铁氧体颗粒，并用作 OER 的催化剂。它们表现出 55 mV ^dec-1 的塔菲尔斜率，需要 334 mV 的过电位才能提供 10 mA ^cm-2 的电流密度，这低于 Co 和 Ni 单独掺杂样品的电流密度。DFT 计算揭示了 Fe 原子周围局部电荷的重新分布、能垒的减少以及掺杂电导率的增加。这项工作揭示了共掺杂对 Fe 基钙钛矿氧化物对 OER 活性的影响，为设计其他钙钛矿基材料进行催化提供了一种策略。