We report a straightforward strategy to design efficient N doped porous carbon (NPC) electrocatalyst that has a high concentration of easily accessible active sites for the CO2 reduction reaction (CO2 RR). The NPC with large amounts of active N (pyridinic and graphitic N) and highly porous structure is prepared by using an oxygen-rich metal-organic framework (Zn-MOF-74) precursor. The amount of active N species can be tuned by optimizing the calcination temperature and time. Owing to the large pore sizes, the active sites are well exposed to electrolyte for CO2 RR. The NPC exhibits superior CO2 RR activity with a small onset potential of -0.35 V and a high faradaic efficiency (FE) of 98.4 % towards CO at -0.55 V vs. RHE, one of the highest values among NPC-based CO2 RR electrocatalysts. This work advances an effective and facile way towards highly active and cost-effective alternatives to noble-metal CO2 RR electrocatalysts for practical applications.

中文翻译：

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具有可控N物种含量的高效多孔碳电催化剂，可选择性减少CO2。

我们报告了一种简单的策略来设计高效的N掺杂多孔碳（NPC）电催化剂，该催化剂具有高浓度的易于还原的CO2还原反应（CO2 RR）活性位。通过使用富含氧的金属-有机骨架（Zn-MOF-74）前驱体制备具有大量活性N（吡啶和石墨N）和高度多孔结构的NPC。可以通过优化煅烧温度和时间来调节活性N物种的数量。由于孔径大，活性位充分暴露于电解质中，从而降低了CO2 RR。与RHE相比，NPC表现出优异的CO2 RR活性，相对于RHE而言，其起始电位低-0.35 V，对CO的法拉第效率（FE）高达98.4％，这是NPC基CO2 RR电催化剂中最高的值之一。