PCEC electrodes are usually composed of an ionic (e.g.,proton-conducting metal oxide) and an electronic (e.g., metal oxide or metal particles) conducting phase that facilitates CO2RR at the interface of solids gas interface. These electrocatalytic interfaces are known as the triple- or double-phase boundary. The critical question the proposed work attempts to address is whether the electrocatalytic properties of the electrode material can be tuned to minimize the overpotential losses associated with electrochemical transformations of CO2 and H2O in PCECs. Furthermore, considering the unique IT regime (i.e., 300-700ºC) in which these cells operate, we assess how the modulation of electrocatalytic properties affects the selectivity of product formation towards syngas and/or C1 and C2 products. The central hypothesis is that changing the electronic and geometric environment at the electrocatalytic interface will affect the elementary steps that govern CO2RR overpotential losses and selectivity. Therefore, tailoring the nature/structure of the electrocatalyst interface can offer an excellent leaver to improved electrocatalyst performance. This work's novelty lies in identifying tunable, highly selective, an economical CO2RR electrocatalysts for PCEC operation via nano-engineered materials. To test our central hypothesis,  the design of nano-structured electrocatalysts with well-defined composition, geometry, and nanoparticle (NPs) distribution as experimental model systems for conducting electrochemical kinetic studies on CO2RR. Using these model systems, will employ a combination of theoretical and experimental approaches to develop design principles that can be used to guide the development of selective CO2RR electrocatalysis at IT conditions.