题目：

Trilayer Polymer Electrolytes Enable Carbon-efficient CO2 to Multicarbon Product Conversion in Alkaline Electrolyzers

作者：

Jundong Wang^1,2, Yuesheng Zhang^1,2, Haoxiang Bai^1,2, Huiying Deng^1,2, Binbin Pan^1,2, Yanguang Li^1,2, Yuhang Wang*^1,2

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University Suzhou215123, China

²Jiangsu Key Laboratory for Advanced Negative Carbon Technologies, Soochow University Suzhou215123, China

摘要：

The electrochemical CO₂reduction reaction (CO₂RR) is an appealing method for carbon utilization. Alkaline CO₂electrolyzers exhibit high CO₂RR activity, low full-cell voltages, and cost-effectiveness. However, the issue of CO₂loss caused by (bi)carbonate formation leads to excessive energy consumption, rendering the process economically impractical. In this study, we propose a trilayer polymer electrolyte (TPE) comprising a perforated anion exchange membrane (PAEM) and a bipolar membrane (BPM) to facilitate alkaline CO₂RR. This TPE enables the coexistence of high alkalinity near the catalyst surface and the H⁺flux at the interface between the PAEM and the cation exchange layer (CEL) of the BPM, conditions favoring both CO₂reduction to multicarbon products and (bi)carbonate removal in KOH-fed membrane electrode assembly (MEA) reactors. As a results, we achieve a Faradaic efficiency (FE) of approximately 46% for C₂H₄, corresponding to a C₂₊FE of 64% at 260 mA cm^-2, with a CO₂-to-C₂H₄single-pass conversion (SPC) of approximately 32% at 140 mA cm^-2— nearly 1.3 times the limiting SPC in conventional AEM-MEA electrolyzers. Furthermore, coupling CO₂reduction with formaldehyde oxidation reaction (FOR) in the TPE-MEA electrolyzer reduces the full-cell voltage to 2.3 V at 100 mA cm^-2without compromising the C₂H₄FE.

影响因子：

16.1

分区情况：

一区

链接：

https://onlinelibrary.wiley.com/doi/abs/10.1002/ange.202404110