Developing highly efficient and selective electrocatalysts for the CO₂ reduction reaction to produce value-added chemicals has been intensively pursued. We report a series of Cu_xO_yC_z nanostructured electrocatalysts derived from a Cu-based MOF as porous self-sacrificial template. Blending catalysts with polytetrafluoroethylene (PTFE) on gas diffusion electrodes (GDEs) suppressed the competitive hydrogen evolution reaction. 25 to 50 wt % teflonized GDEs exhibited a Faradaic efficiency of ≈54 % for C₂₊ products at −80 mA cm⁻². The local OH⁻ ions activity of PTFE-modified GDEs was assessed by means of closely positioning a Pt-nanoelectrode. A substantial increase in the OH⁻/H₂O activity ratio due to the locally generated OH⁻ ions at increasing current densities was determined irrespective of the PTFE amount.

中文翻译：

---

用于电化学 CO2 还原和局部 pH 变化影响的金属-有机骨架衍生的 CuxOyCz 催化剂

开发用于 CO ₂还原反应以生产高附加值化学品的高效和选择性电催化剂已得到深入研究。我们报告了一系列源自 Cu 基 MOF 作为多孔自牺牲模板的 Cu _x O _y C _z纳米结构电催化剂。在气体扩散电极 (GDE) 上将催化剂与聚四氟乙烯 (PTFE) 混合可抑制竞争性析氢反应。25 至 50 重量% 的聚四氟乙烯 GDE在 -80 mA cm ^{-2 下}对 C ₂₊产物表现出≈54% 的法拉第效率。当地的 OH ^-通过紧密放置 Pt 纳米电极来评估 PTFE 改性 GDE 的离子活性。由于在增加的电流密度下局部产生的 OH ^-离子，确定了 OH ^- /H ₂ O 活性比的显着增加，而与 PTFE 量无关。