Designing and constructing transition metal sulfides (TMSs) as oxygen evolution reaction (OER) electrocatalysts has been attracting increasing attention. Interface engineering can effectively modify the active sites and promote electron transfer, resulting in improvement of electrocatalytic performance. Here, freestanding heterogeneous CoS₂/CoS nanosheets are prepared via a simple one‐step sintering process from a kind of novel hierarchical tremella‐like metal–organic framework (MOF). The formation mechanism of the unique MOF and the heterojunctions between CoS₂ and CoS is analyzed. Consequently, the prepared cost‐effective OER electrocatalyst achieves satisfying electrocatalytic efficiencies with a diminutive overpotential of 269 mV at 10 mA cm⁻² current density, a small Tafel slope of 52 mV dec⁻¹, and good stability in alkaline solution comparable to RuO₂ counterparts. This work opens up a new method for constructing 2D electrocatalysts containing catalytic interfaces with boosted OER performance.

中文翻译：

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一种新型的金属-有机骨架介导的非均相CoS2 / CoS多孔纳米片的合成，以增强氧气的释放反应

作为氧释放反应（OER）电催化剂的过渡金属硫化物（TMS）的设计和构建已引起越来越多的关注。界面工程可以有效地修饰活性位并促进电子转移，从而改善电催化性能。在这里，独立的异质CoS ₂ / CoS纳米片是通过一种简单的一步烧结过程从一种新颖的类似银耳的金属有机骨架（MOF）制备的。分析了独特MOF的形成机理以及CoS ₂与CoS之间的异质结。因此，所制备的经济高效的OER电催化剂在10 mA cm ^-2时的过小电位为269 mV，可实现令人满意的电催化效率。电流密度，Tafel斜率较小，为52 mV dec ^-1，并且在碱性溶液中具有与RuO ₂相当的稳定性。这项工作开辟了一种新的方法，用于构建包含具有增强的OER性能的催化界面的2D电催化剂。