We describe the fabrication of gas diffusion electrodes modified with polymer/enzyme layers for electroenzymatic CO₂ fixation. For this, a metal-free organic low-potential viologen-modified polymer has been synthesized that reveals a redox potential of around −0.39 V vs SHE and is thus able to electrically wire W-dependent formate dehydrogenase from Desulfovibrio vulgaris Hildenborough, which reversibly catalyzes the conversion of CO₂ to formate. The use of gas diffusion electrodes eliminates limitations arising from slow mass transport when solid carbonate is used as CO₂ source. The electrodes showed satisfactory stability that allowed for their long-term electrolysis application for electroenzymatic formate production.

中文翻译：

---

使用氧化还原聚合物/酶修饰的气体扩散电极固定CO _2的电催化

我们描述了用聚合物/酶层修饰的气体扩散电极的制造方法，用于电化学CO ₂固定。为此，已合成了一种无金属的有机低电位经紫精改性的聚合物，该聚合物显示出相对于SHE约为-0.39 V的氧化还原电势，因此能够与来自Desulfovibrio vulgaris Hildenborough的W依赖的甲酸脱氢酶进行电连接，该酶可逆地催化CO ₂转化为甲酸。当使用固体碳酸盐作为CO ₂源时，气体扩散电极的使用消除了因缓慢的质量传输而引起的限制。电极表现出令人满意的稳定性，可长期用于电解生产甲酸酶。