Gas diffusion electrodes (GDEs) with high electrochemically active surface areas (ECSAs) and triple-phase boundaries for efficient gas, electron, and ion transport offer a unique opportunity for high-rate electrochemical CO reduction (COR) in relative to traditional aqueous configurations. Cu-nanoparticle-based GDEs were fabricated by applying a mixture of carbon powders, copper acetate aqueous solution, and Teflon onto a Cu gauze substrate. The catalyst-coated substrate was air-dried, mechanically pressed, and subsequently annealed under forming gas to produce GDEs. Two distinctive types of GDE configurations, a flow-through configuration and a flow-by configuration, were constructed, characterized, and tested to quantitatively evaluate the effects of reactant gas transport on the activity and the selectivity of the GDE materials for COR. In the flow-through configuration, a high partial current density of 50.8 mA cm^–2 for COR to C₂H₄ was achieved at −0.85 V vs RHE in 10 M KOH at −15 °C, while in the flow-by configuration with the same catalyst materials the partial current density for C₂H₄ generation was limited to <1 mA cm^–2.

中文翻译：

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铜纳米粒子基气体扩散电极高速率电化学还原一氧化碳为乙烯

相对于传统的水性配置，具有高电化学活性表面积（ECSA）和三相边界的气体扩散电极（GDE）具有高效的气体，电子和离子传输能力，为高速率电化学还原CO（COR）提供了独特的机会。通过将碳粉，醋酸铜水溶液和特富龙的混合物涂在铜丝网上来制造基于铜纳米粒子的GDE。将涂覆有催化剂的基材进行空气干燥，机械加压，然后在形成气体下进行退火，以生产GDE。构造，表征和测试了两种独特类型的GDE配置：流通配置和流通配置，以定量评估反应物气体传输对GDE材料对COR的活性和选择性的影响。在−15°C下于10 M KOH中，相对于RHE而言，相对于RHE而言，COR至C ₂ H _4的结果为^–2，而在相同催化剂材料的流通配置中，产生C ₂ H ₄的分电流密度为_–2限制为<1 mA cm ^–2。