【摘要】 析氧反应（OER）催化剂在催化反应过程中不可避免地会发生表面重构，这一过程使得设计、构筑高性能和高稳定性的OER电催化剂充满挑战。在此，我们采用双金属浸出诱导表面重构的策略，构建了高活性和高稳定性的水氧化电催化剂。在该策略中，通过水热、离子交换和后续的退火工艺处理，将由α-CoMoO₄、K₂Co₂（MoO₄）₃、Co₃O₄和CoFe₂O₄四种氧化物晶相组成的材料阵列转换为OER预催化剂。原位电化学拉曼光谱和非原位X射线衍射（XRD）分析表明，其中的不稳定成分K₂Co₂（MoO₄）₃的快速溶解引发了Mo和K的适度浸出，从而在低电压下加速了表面富集的α-Co（OH）₂向CoOOH活性相的转化。此外，CoFe₂O₄相耦合重构产生新相CoO与无定形层CoOOH，从而形成了CoFe₂O4@CoO@CoOOH紧密的多相结构，起到了“纳米栅栏”的作用，可有效防止催化剂的过度重构，从而赋予重构后的催化剂优异的催化活性和稳定性。本工作为设计高电流密度下具有优异活性和稳定性的OER催化剂提供了新的思路。更多还原

【Abstract】 Surface reconstruction inevitably occurs during pre-catalysis for the oxygen evolution reaction（OER）; however, obtaining OER electrocatalysts with high performance and stability remains a challenge. In this study, we have developed a bimetallic leaching-induced surface reconstruction strategy to fabricate efficient electrocatalysts for water oxidation. Microcolumn arrays consisting of α-CoMoO₄, K₂Co₂（MoO₄）₃, Co₃O₄, and CoFe₂O₄ four-phase oxides were integrated as pre-catalyst by a hydrothermal, ion-exchange, and subsequent annealing process. In situ Raman spectroelectrochemical and ex situ X-ray diffraction（XRD） studies revealed that the rapid dissolution of the unstable component K2Co2（Mo O4）3 triggered the adaptive leaching of Mo and K, which accelerated the transformation of the surface-enriched α-Co（OH）₂ to the active phase of CoOOH at low voltage. Furthermore, the stable CoFe₂O₄ component couples the reconfigured new phase CoO with the amorphous layer CoOOH to form a compact hierarchical structure of CoFe₂O₄@CoO@CoOOH, which plays the role of a nanofence and effectively prevents the catalyst from over-reconstruction, thus achieving excellent catalytic stability. This work provides a novel idea for designing OER catalysts with excellent activity and stability at high current densities.更多还原