Appropriate contact of catalysts with reactants calls for optimized exposure of active sites in the near-surface region, which can be accomplished by tuning the surface reconstruction degree. Understanding and conducting the controllable surface reconstruction of oxygen evolution reaction (OER) catalysts lays the foundation to finetune their OER activity. Herein, we explore the construction of a tunable amorphous oxyhydroxide shell on LiCo_1.9Fe_0.1O₄ via heat-sulfurization followed by electrochemical treatment. The 8-electrons sulfide oxidation reaction (SOR) transforms the sulfide shell to amorphous oxyhydroxide and generates surface-anchored SO₄^2-, which act together to boost the OER. The electrocatalyst with optimal sulfurization exhibits 2.57 times the current density at 1.6 V vs. RHE compared to the original LCFO. This work is dedicated to understanding controllable reconstruction and designing efficient OER electrocatalysts.

中文翻译：

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硫氧化介导的 LiCo1.9Fe0.1O4 可控重构促进电化学水氧化


催化剂与反应物的适当接触需要优化近表面区域中活性位点的暴露，这可以通过调整表面重建程度来实现。了解和实施析氧反应 （OER） 催化剂的可控表面重构为微调其 OER 活性奠定了基础。在此，我们探索了通过热硫化和电化学处理在 LiCo_1.9Fe_0.1O₄ 上构建可调非晶羟基氧化物壳层。8 电子硫化物氧化反应 （SOR） 将硫化物壳层转化为无定形羟基氧化物，并产生表面锚定的 SO₄^2-，它们共同作用以提高 OER。与原来的 LCFO 相比，具有最佳硫化的电催化剂在 1.6 V 时的电流密度是 RHE 的 2.57 倍。这项工作致力于理解可控重构和设计高效的 OER 电催化剂。