The improvement of the electrochemical behavior of solid oxide cells (SOC) strongly depends on optimizing the oxygen electrode architecture and the choice of electrochemically active materials. Lanthanide-nickelates are considered as interesting candidates for the active functional layer in high- to intermediate temperature SOC, however thermally induced cell deterioration remains a challenge. Based on decomposition studies of praseodymium-nickelate (Pr2NiO4+δ, PNO) [1], the electrochemical properties of one of its decomposition products, Pr6O11, were investigated by Rakesh et al. [2]. For nanostructured Pr6O11 electrodes, deposited by means of electrostatic spray deposition (ESD) on top of GDC (Ce0.9Gd0.1O2−δ) electrolytes, exceptional low values of polarization resistance were found (0.02 Ω cm 2 at 600 °C). Combined with the observed chemical stability (10 days, 800 °C, air), the material was considered a potentially interesting SOC oxygen electrode material for intermediate temperature application. The focus of this work was put on the synthesis and electrochemical testing of Pr6O11-GDC composite electrodes by ESD and screen-printing (SP) with the aim to increase the electrochemically active interface (triple-phase boundary, TPB) between electrolyte and electrode material and to support ionic charge transfer. Specifically, the influence of electrode architecture was investigated by comparing double-layer (Pr6O11 topped by a LSM current collecting layer (CCL)) and triple-layer architectures (Pr6O11 on porous, screen-printed GDC, topped by a LSM-CCL), which were prepared based on previous work [3]. In this talk, the impact of ESD parameters and sintering conditions on the Pr6O11 electrode nanostructure is presented, as well as the importance of a minimum CCL thickness. As a consequence of different grain sizes and porosity at the Pr6O11-GDC interface, an emphasis is put on the development of polarization resistance values. Finally, the study of an “ex-situ” composite triple-layer architecture Pr6O11-GDC cell is discussed.