电催化剂
计时安培法
电解质
介电谱
电化学
循环伏安法
电极
气体扩散电极
气体扩散
化学
扩散
化学工程
催化作用
无机化学
材料科学
分析化学(期刊)
作者
Daniele Giusi,Matteo Miceli,Chiara Genovese,Gabriele Centi,Siglinda Perathoner,Claudio Ampelli
标识
DOI:10.1016/j.apcatb.2022.121845
摘要
Copper oxide-based gas-diffusion electrodes (Cu x O/GDEs) for CO 2 electrocatalytic reduction are investigated in presence and absence of liquid electrolyte (liquid- and gas-phase operations) in terms of (i) catalytic reactivity in compact-design flow cells (with the electrodes located on the two sides of a Nafion membrane) and (ii) in situ electrochemical characterization by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and chronoamperometry (CA). On the same electrocatalyst, the adoption of liquid- or gas-phase operations induces significant changes in the catalytic behaviour with formation of C2+ chemicals observed only in gas-phase. Parallel tests by EIS, complemented by CV and CA measurements, evidence that the catalytic properties of these electrodes, and in turn the selectivity paths, are largely determined by transport limitations rather than only by the intrinsic properties of the electrocatalysts. The EIS technique, used here for the first time to compare liquid- and gas-phase operations, has proved to be a strategic tool, providing insights into the critical factors needed to optimize performance beyond the properties of the electrocatalysts themselves. • Cu x O-based gas-diffusion electrodes (GDEs) are prepared by easy scalable methodology • Cu x O-GDEs are studied in liquid- and gas-phase operations for CO 2 electroreduction • The same type of electrocatalyst behaves differently when processed in gas-phase • EIS data provide insights into proton and CO 2 -adspecies transport limitations • C2+ products form only in gas phase when proton diffusion becomes the limiting step
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