Microenvironment Regulation Strategies Facilitating High-Efficiency CO2 Electrolysis in a Zero-Gap Bipolar Membrane Electrolyzer,ACS Applied Materials & Interfaces

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Microenvironment Regulation Strategies Facilitating High-Efficiency CO2 Electrolysis in a Zero-Gap Bipolar Membrane Electrolyzer
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-11-13 , DOI: 10.1021/acsami.3c10817
Pengtao Yue _{1,

2} , Qian Fu _{1,

2} , Jun Li _{1,

2} , Liang Zhang _{1,

2} , Dingding Ye _{1,

2} , Xun Zhu _{1,

2} , Qiang Liao _{1,

2}

Affiliation

In alkaline and neutral zero-gap CO₂ electrolyzers, the carbon utilization efficiency of the electrocatalytic CO₂ reduction to CO is less than 50% because of inherently homogeneous reactions. Utilization of the bipolar membrane (BPM) electrolyzer can effectively suppress (bi)carbonate formation and parasitic CO₂ losses; however, an excessive concentration of H⁺ in the catalyst layer (CL) significantly hinders the activity and selectivity for CO₂ reduction. Here, we report a microenvironment regulation strategy that controls the CL thickness and ionomer content to regulate local CO₂ transport and the local pH within the CL. We report 80% faradaic efficiency of CO at a current density of 400 mA/cm² without the use of a buffering layer, exceeding that of state-of-the-art catalysts with a buffering layer. A carbon utilization efficiency of 63.6% at 400 mA/cm² is also obtained. This study demonstrates the significance of regulating the microenvironment of the CL in a BPM system.

中文翻译：

促进零间隙双极膜电解槽高效 CO2 电解的微环境调节策略

在碱性和中性零间隙CO _{2电解槽中，由于固有的均相反应，电催化CO}₂还原成CO的碳利用率低于50%。利用双极膜（BPM）电解槽可以有效抑制碳酸氢盐的形成和寄生CO ₂损失；^{然而，催化剂层(CL)中H +}浓度过高会显着阻碍CO ₂还原的活性和选择性。在这里，我们报告了一种微环境调节策略，该策略控制 CL 厚度和离聚物含量，以调节CL 内的局部 CO _{2传输和局部 pH 值。}^{我们报告在不使用缓冲层的情况下，在电流密度为 400 mA/cm 2}时， CO 的法拉第效率为 80% ，超过了具有缓冲层的最先进催化剂。^{在400mA/cm 2}下还获得了63.6%的碳利用率。这项研究证明了在 BPM 系统中调节 CL 微环境的重要性。

更新日期：2023-11-13

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