CO production, which is known for its efficient use of fewer electrons, has garnered significant attention owing to its potential applications in downstream industries. This study introduces a novel method for synthesizing the Ni–N–C structure with Ni, using a porous metal–organic framework (MOF) and a zeolitic imidazolate framework (ZIF), which is a type of material under MOFs, with the structural configuration of MOF@MOF. Decoupling the inner electron-transfer paths from the outer active sites makes it possible to obtain a high partial current for CO while minimizing the content of Ni. In addition, the pyrolyzed host MOF has superhydrophobic properties, making the inner space of Ni–N–C-748 a favorable environment for CO₂ that prevents the hydrogen evolution reaction. Consequently, Ni–N–C-748 exhibited a faradaic efficiency for CO greater than 95% over a wide potential range. Furthermore, a potential of 2.1 V was obtained at 100 mA cm⁻² using a membrane electrode assembly cell.

中文翻译：

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一种基于 MOF@MOF 构型的 Ni–N–C CO2 电还原催化剂，表现出广泛的活性反应位点


一氧化碳生产以其有效利用较少的电子而闻名，由于其在下游行业的潜在应用而受到广泛关注。本研究介绍了一种用 Ni 合成 Ni-N-C 结构的新方法，使用多孔金属有机框架 （MOF） 和沸石咪唑骨架 （ZIF），这是 MOF 下的一种材料，结构构型为 MOF@MOF。将内部电子转移路径与外部活性位点解耦，可以获得高 CO 部分电流，同时最大限度地减少 Ni 的含量。此外，热解的宿主 MOF 具有超疏水特性，使 Ni-N-C-748 的内部空间成为 CO₂ 的有利环境，从而阻止析氢反应。因此，Ni-N-C-748 在较宽的电位范围内表现出大于 95% 的 CO 法拉第效率。此外，使用膜电极组装池在 100 mA ^cm-2 处获得 2.1 V 的电位。