In terms of promising candidates for high‐performance fuel cells and water splitting electrocatalysts, two‐dimensional (2D) materials refer to a class of materials with high electrical conductivity along 2D conducting channels and possessing abundant active sites in the form of surface atoms and edge sites. Herein, we report an ammonia‐modulated method for the synthesis of nanosized bimetallic ZnCo‐ZIF, and owing to quantum effects, the nanosized ZnCo‐ZIF can be transformed into novel 2D nanosheet arrays, which can be used as a bifunctional electrocatalyst. The size of the ZnCo‐ZIF crystals can be controlled to less than 10 nm by increasing the ammonia amount. The products from the nanosized particles through calcination have a distinct structure from the microsized nanoparticles owing to quantum effects and appear to be well‐aligned 2D mono‐crystalline Co₃O₄‐embedded nitrogen‐doped porous carbon nanosheet arrays (2D‐MCo₃O₄‐NCNAs). These novel 2D nanosheet arrays lead to large active surface areas, enhanced mass/charge transport capability, numerous active sites, and strong structure stability. When used as bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), the 2D‐MCo₃O₄‐NCNAs exhibit superior ORR activity as well as efficient OER activity in alkaline electrolyte, in comparison to the state‐of‐the‐art precious metal catalysts.

中文翻译：

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量子效应允许从双金属MOFs作为双功能氧电催化剂构建二维Co3O4嵌入的氮掺杂多孔碳纳米片阵列。

就高性能燃料电池和水分解电催化剂的有希望的候选者而言，二维（2D）材料是指一类沿2D导电通道具有高电导率并具有丰富的表面原子和边缘形式的活性位的材料网站。在本文中，我们报道了一种氨调节的方法来合成纳米级双金属ZnCo-ZIF，由于量子效应，纳米级ZnCo-ZIF可以转化为新型二维纳米片阵列，可用作双功能电催化剂。可以通过增加氨量将ZnCo-ZIF晶体的尺寸控制在10 nm以下。₃ O ₄嵌入的氮掺杂多孔碳纳米片阵列（2D-MCo ₃ O ₄ - NCNA）。这些新颖的2D纳米片阵列可产生较大的活性表面积，增强的质量/电荷传输能力，大量的活性位点以及强大的结构稳定性。当用作氧还原反应（ORR）和氧释放反应（OER）的双功能催化剂时，与碱性状态相比，2D-MCo ₃ O ₄ -NCNA在碱性电解液中表现出优异的ORR活性和有效的OER活性。最先进的贵金属催化剂。