Electroreduction of carbon dioxide (CO₂) into high‐value and readily collectable liquid products is vital but remains a substantial challenge due to the lack of highly efficient and robust electrocatalysts. Herein, Bi‐based metal‐organic framework (CAU‐17) derived leafy bismuth nanosheets with a hybrid Bi/BiO interface (Bi NSs) is developed, which enables CO₂ reduction to formic acid (HCOOH) with high activity, selectivity, and stability. Specially, the flow cell configuration is employed to eliminate the diffusion effect of CO₂ molecules and simultaneously achieve considerable current density (200 mA cm⁻²) for industrial application. The faradaic efficiency for transforming CO₂ to HCOOH can achieve over 85 or 90% in 1 m KHCO₃ or KOH for at least 10 h despite a current density that exceeds 200 mA cm⁻², outperforming most of the reported CO₂ electroreduction catalysts. The hybrid Bi/BiO surface of leafy bismuth nanosheets boosts the adsorption of CO₂ and protects the surface structure of the as‐prepared leafy bismuth nanosheets, which benefits its activity and stability for CO₂ electroreduction. This work shows that modifying electrocatalysts by surface oxygen groups is a promising pathway to regulate the activity and stability for selective CO₂ reduction to HCOOH.

中文翻译：

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双基金属有机骨架衍生的叶状铋纳米片用于二氧化碳电还原

将二氧化碳（CO ₂）电还原为高价值且易于收集的液体产品至关重要，但由于缺乏高效，坚固的电催化剂，仍然是一项严峻的挑战。本文中，开发了具有混合Bi / BiO界面（Bi NSs）的基于Bi的金属有机骨架（CAU-17）衍生的叶状铋纳米片，该片能够以高活性，高选择性将CO ₂还原为甲酸（HCOOH）。 ，以及稳定性。特别地，采用流通池配置以消除CO ₂分子的扩散效应，并同时实现相当大的工业应用电流密度（200 mA cm ^-2）。转化CO ₂的法拉第效率尽管电流密度超过200 mA cm ^-2，但在1 m KHCO ₃或KOH中，HCOOH的转化率仍可在至少10 h内达到85％或90％以上，优于大多数报道的CO ₂电还原催化剂。叶状铋纳米片的杂化Bi / BiO表面增强了CO ₂的吸附并保护了制备的叶状铋纳米片的表面结构，这有利于其活性和对CO ₂电还原的稳定性。这项工作表明，通过表面氧基团修饰电催化剂是调节有选择地将CO ₂还原为HCOOH的活性和稳定性的有前途的途径。