Transition‐metal chalcogenides have been widely investigated as a class of promising oxygen evolution reaction (OER) catalysts. But, they are still far from practical use because of moderate catalytic activity. Two‐dimensional (2D) materials with porous nanostructures are attractive for the efficient conversion of electrochemical energy. Herein, Co_1‐xS novel porous microplates were synthesized through a facile self‐templated strategy based on the Kirkendall effect. By taking advantages of porous nanostructure and good catalytic properties of the hexagonal Co(OH)₂ template, the unique Co_1‐xS microplates provide higher efficient surface area and more accessible active sites. Moreover, the mass transfer and gas diffusion are also promoted, owing to the pores developed inside the microplates. As expected, the optimized porous Co_1‐xS microplates demonstrate remarkable OER performance in alkaline electrolyte with an overpotential of 311 mV at 10 mA cm⁻², a Tafel slope of 55 mV dec⁻¹ and long‐term stability, which outperform the commercial IrO₂ catalyst. The facile preparation, high catalytic activity, and excellent durability of the Co_1‐xS porous hexagonal microplates show great promise in energy conversion applications.

中文翻译：

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自模板合成Co1-xS多孔六边形微孔板，可有效释放电催化氧

过渡金属硫属化物已被广泛研究为一类有前途的析氧反应（OER）催化剂。但是，由于中等的催化活性，它们仍远未实用。具有多孔纳米结构的二维（2D）材料对于有效转换电化学能具有吸引力。在此，基于柯肯德尔效应，通过一种简便的自模板化策略合成了Co _{1 x x} S新型多孔微孔板。通过利用六角形Co（OH）₂模板的多孔纳米结构和良好的催化性能，独特的Co _{1- x}S型微孔板可提供更高的有效表面积和更易于接近的活性位点。此外，由于微板内部形成的孔，也促进了质量传递和气体扩散。如预期的那样，优化的多孔Co _{1- x} S微孔板在碱性电解液中表现出卓越的OER性能，在10 mA cm ^-2时的超电势为311 mV ，Tafel斜率为dec ^-1的55 mV ，长期稳定性优于商用IrO ₂催化剂。Co _{1‐ x} S多孔六角形微孔板的简便制备，高催化活性和出色的耐用性在能量转换应用中显示出巨大的希望。