Here, we propose a novel synthetic strategy to fabricate a two-dimensional (2D) N-doped carbon nanobelt with high electrocatalytic activity using a dual-MOF superstructure precursor. The self-assembly mechanism induced by Van der Waals forces ensures the successful formation of a 2D ZIF-8/ZIF-67 dual-MOF superstructure through a straightforward ice-templating co-assembly method. Additionally, N-doped carbon derived from ZIF-8 can capture cobalt species from the adjacent ZIF-67 during the pyrolysis process, resulting in the coexistence of atomically dispersed Co single atoms and nanoparticles within the carbon nanobelt, effectively enhancing the intrinsic activity for the electrocatalytic oxygen reduction reaction (ORR). Furthermore, the interconnected hierarchically porous carbon nanocubes in the kinetic-favorable 2D carbon nanobelt superstructure can maximize the exposure of accessible active sites, overcome macroscopic mass transfer limitations, and accelerate the reaction kinetics. Hence, the as-prepared carbon nanobelt exhibits outstanding alkaline ORR catalytic activity with a half-wave potential of 0.888 V versus RHE, and the assembled Zn–air batteries display a prominent peak power density of 179 mW cm⁻¹. The present work highlights the simplicity and versatility of the ice-templating assisted co-assembly strategy in preparing efficient 2D carbon-based superstructure electrocatalysts.

在这里，我们提出了一种新的合成策略，使用双 MOF 超结构前体制造具有高电催化活性的二维（2D）N 掺杂碳纳米带。范德华力诱导的自组装机制确保通过简单的冰模板共组装方法成功形成 2D ZIF-8/ZIF-67 双 MOF 上部结构。此外，ZIF-8衍生的氮掺杂碳可以在热解过程中捕获相邻ZIF-67的钴物质，导致原子分散的Co单原子和纳米颗粒在碳纳米带内共存，有效增强了碳纳米带的内在活性。电催化氧还原反应（ORR）。此外，动力学有利的二维碳纳米带超结构中互连的分层多孔碳纳米立方体可以最大限度地暴露可接近的活性位点，克服宏观传质限制，并加速反应动力学。因此，所制备的碳纳米带表现出出色的碱性ORR催化活性，相对于RHE，半波电位为0.888 V，并且组装的锌空气电池表现出179 mW cm -1 的显着峰值功率^密度。目前的工作强调了冰模板辅助共组装策略在制备高效二维碳基超结构电催化剂中的简单性和多功能性。