Oxygen electrodes and steam electrodes are designed and tested to develop improved solid oxide electrolysis cells for H 2 production with the cell support on the oxygen electrode. The electrode performance is evaluated by impedance spectroscopy testing of symmetric cells at open circuit voltage (OCV) in a one-atmosphere set-up. For the oxygen electrode, nano-structured La 0.75 Sr 0.25 MnO 3 (LSM25) is impregnated into a LSM25/yttria stabilised zirconia (YSZ) composite, whereas for the steam electrode, nano-structured Ni and Ce 0.8 Gd 0.2 O 2−δ (CGO) is impregnated into a Sr 0.94 Ti 0.9 Nb 0.10 O 3−δ (STN) backbone. In the present study, the best performing oxygen electrode is a LSM25-YSZ composite with 20% porosity and impregnated with a LSM25 solution measuring a polarisation resistance (R p ) of 0.12Ωcm 2 at 850°C in oxygen. For the steam electrode, the best performance is obtained for a STN backbone, sintered at 1200°C and impregnated with CGO/Ni, with an R p of 0.08Ωcm 2 at 850°C in 3% H 2 O/H 2 .