Bi-based electrode is believed to be one of the promising cathodes for the electroreduction of CO₂ to formate. However, it suffers from energy- and/or time-consuming preparation process and mass transfer limitation of the reactants. Here, we fabricated a novel networked Bi-based electrode by formed in situ from Bi dendrites integrated into a Cu mesh substrate via a facile replacement reaction with energy and time savings. The as-prepared electrode was directly used as a cathode for electroreduction of CO₂ to formate without further treatment. It exhibits a formate Faraday efficiency of ≈ 100 %. Additionally, partial current density for formate is as high as 68.51 ± 4.04 mA cm^-2. This performance outperforms other results obtained on Bi-based electrodes—even most gas-diffusion electrodes under similar conditions. The excellent performance seen here is most likely attributed to its large surface area and fast transport of the reactants. This originates from the Bi dendrites catalysts and the unique network structure of the Cu mesh substrate. This work offers a facile route to obtain an efficient and robust electrode for electroreduction of CO₂ to formate, which makes it easy to scale up in industrial applications.

据信Bi基电极是用于CO ₂电还原成甲酸酯的有希望的阴极之一。然而，它遭受能量和/或费时的制备过程和反应物的传质限制。在这里，我们通过由Bi树枝状晶体通过便捷的置换反应并节省能源和时间而由Bi树枝状晶体原位形成，从而制造了一种新型的基于网络的Bi电极。所制备的电极无需进一步处理即可直接用作阴极以将CO ₂电还原成甲酸。它显示出约100％的甲状法拉第效率。此外，甲酸的部分电流密度高达68.51±4.04 mA cm ^-2。这种性能优于在Bi基电极上获得的其他结果，即使在类似条件下，即使是大多数气体扩散电极也是如此。此处看到的出色性能很可能归因于其较大的表面积和反应物的快速传输。这源于Bi树枝状催化剂和Cu网状基材的独特网络结构。这项工作提供了一种简便的途径来获得一种高效而坚固的电极，用于将CO ₂电还原成甲酸酯，从而使其易于在工业应用中进行规模放大。