Layered alkali metal oxides have been emerged as an alternative group of low-cost and promising electrocatalysts in water oxidation. The distinct layered configuration may offer some interesting possibilities to tune the intrinsic activity by regulating the intralayer edge-shared CoO₆ octahedra and the CoO₂ interlayer spacing/strain. In this work, electrochemical desodiation tuning method is explored on intralayer Ag, Cu, Ce-doped Na_0.7CoO₂ for highly active OER catalysts. It is demonstrated that the ΔG_OH* value in the volcano plot is optimized by proper desodiation. Meanwhile, the lattice strain introduced along with the desodiated process modulates the ΔG_OH*, according to first principle calculations. It shows that ∼0.157 % compressive strain in the CoO₂ layers and ∼1% tensile strain between CoO₂ layers are introduced in the desodiated Ag doped Na_0.7CoO₂. Among these catalysts, the desodiated Ag-Na_0.7CoO₂ sample exhibits an optimal RuO₂-beyond water oxidation (OER) activity with the lowest overpotential of 236 mV@10 mA/cm², the smallest Tafel slope of 48 mV/dec and the highest mass current density of 227.8 A/g. This work provides an interesting avenues to optimize existing layered materials with inter/intralayer modifications for highly efficient water oxidation electrolysis.

层状碱金属氧化物已成为水氧化中低成本和有前途的电催化剂的替代组。通过调节层内边缘共享的 CoO ₆八面体和 CoO ₂层间间距/应变，独特的分层配置可以提供一些有趣的可能性来调整内在活性。在这项工作中，针对高活性 OER 催化剂在层内 Ag、Cu、Ce 掺杂的 Na _0.7 CoO ₂上探索了电化学去钠调节方法。结果表明，火山图中的 ΔG _OH*值是通过适当的脱钠优化的。同时，随着脱氧过程引入的晶格应变调节了 ΔG _OH*，根据第一性原理计算。它表明，在CoO的~0.157％压缩应变_2层的CoO之间的层和〜1％的拉伸应变₂层在desodiated银引入掺杂的Na _0.7 CoO的₂。在这些催化剂中，脱钠的 Ag-Na _0.7 CoO ₂样品表现出最佳的 RuO _{2 -}超越水氧化（OER）活性，最低过电位为 236 mV@10 mA/cm ²，最小的 Tafel 斜率为 48 mV/dec 和最高质量电流密度为 227.8 A/g。这项工作提供了一种有趣的途径，可以通过层间/层内修饰来优化现有的层状材料，以实现高效的水氧化电解。