The carbon dioxide (CO₂) electroreduction to formate is nowadays considered as a promising approach to convert CO₂ into a value-added product and simultaneously, in the context of strategies for mitigating climate change. However, there is a scarce number of studies published in the literature operating with a current density higher than 200 mA cm⁻², and there is the need of operating at higher current densities, with acceptable performance and low penalty in terms of energy consumption, for future implementation at industrial scale. Thus, in this work, a novel configuration is studied using a filter press reactor in a continuous mode, with a single pass of the reactants through the cell, employing a Sustainion anion exchange membrane and working with a current density up to 600 mA cm⁻². Using the same electrocatalysts, the configuration shows a similar performance to the GDE configuration with liquid electrolyte, but with the advantage of operating only with a vapour input to the cathode and avoiding the need for a liquid catholyte. Although at the expense of obtaining a more diluted product, excellent combinations of Faradaic Efficiency for formate (73.7 %), energy consumptions (342 kWh·kmol^-1), and product rates (22.9 mmol m⁻²·s^-1) can be achieved at high current densities. Therefore, the configuration with Sustainion membranes reported in this manuscript can be particularly interesting for future applications that do not involve a very concentrated formate product.

二氧化碳 (CO ₂ ) 电还原成甲酸盐现在被认为是将 CO ₂转化为高附加值产品的有前途的方法，同时，在缓解气候变化的战略背景下。然而，文献中发表的研究数量很少，电流密度高于 200 mA cm ^-2，并且需要在更高的电流密度下运行，在能源消耗方面具有可接受的性能和低损失，以便未来在工业规模上实施。因此，在这项工作中，使用连续模式的压滤反应器研究了一种新型配置，反应物单次通过电池，采用 Sustainion 阴离子交换膜，电流密度高达 600 mA cm ^{- 2}. 使用相同的电催化剂，该配置显示出与使用液体电解质的 GDE 配置相似的性能，但具有仅在蒸汽输入到阴极的情况下运行的优点，并且不需要液体阴极电解液。虽然以获得更稀释的产品为代价，但甲酸盐法拉第效率 (73.7 %)、能源消耗 (342 kWh·kmol ^-1 ) 和产品率 (22.9 mmol m ^-2 ·s ^-1 ) 的出色组合可以在高电流密度下实现。因此，本手稿中报道的带有 Sustainion 膜的配置对于不涉及非常浓缩的甲酸盐产品的未来应用可能特别有趣。