Structural, thermomechanical and electrical properties of new (1 − x)Ce0.8Nd0.2O2−δ–xBaCe0.8Nd0.2O3−δ composites

Advanced materials for SOFC application: Strategies for the development of highly conductive and stable solid oxide proton electrolytes

“…Medvedev et al [124] were also focused on the features of thermomechanical and transport properties of (1-x)Ce 0.8 Nd 0.2 O 2-δ -xBaCe 0.8 Nd 0.2 O 3-δ composites (for x=0, 0.25, 0.5, 0.75 and 1) prepared according to the citrate-nitrate combustion synthesis method and sintered at 1500°C for 5 h. Such preparation method allowed the authors to reach high relative density of ceramics (more than 93%, almost for all compositions) and to avoid its influence on the total conductivity. For this system the same electron blocking effect for composites ( Figure 30a) was found, as in a previous work [123], although the ionic conductivity of materials is significantly decreased with increasing of perovskite phase up to 50 mol%.…”

“…It is worth noting that no significant chemical expansion, associated with the pO 2 change, is observed for proton-conducting electrolytes (see Fig. 30b for x = 1 [124] and Fig. 8 in [139]).…”

“…Total conductivity at 700°C (a) and isothermal (chemical) expansion at 900°C for (1-x)Ce 0.8 Nd 0.2 O 2-δ -xBaCe 0.8 Nd 0.2 O 3-δ ceramic materials[124].Interesting results were obtained by submitting the composite materials in 2 redoxcycles ((pO 2 ) 1 =0.21 atm → (pO 2 ) 2 =1·10 -18 atm → (pO 2 ) 3 =0.21 atm → (pO 2 ) 4 =1·10 -18 atm → (pO 2 ) 5 =0.21 atm) for 200 h[124]. It was found that the total conductivity of Ce 0.8 Nd 0.2 O 2-δ decreases by 85% from the initial value after 2 redox cycles.…”

Enhancing the sinterability and electrical properties of BaZr0.1Ce0.7Y0.2O3‐δ proton‐conducting ceramic electrolyte

“…[35][36][37] The composite electrolytes enhance chemical stability under CO 2 and H 2 O atmospheres. 36,37 In particular, the BaZr 0.85 Y 0.15 O 3−δ -Nd 0.1 Ce 0.9 O 2−δ composite materials exhibited significantly improved chemical stability under CO 2 atmosphere and higher conductivity compared with the BZY. 37 A novel approach was proposed in this study to fabricate composite electrolytes using proton-conducting BZCY and LSGM electrolytes to enhance the sinterability and electrical properties of BZCY.…”

“…As an alternative method to improve the functional properties of electrolyte, a concept of composite electrolyte that associates the excellent properties of protons and oxygen‐ion conductors has been proposed 35‐37 . The composite electrolytes enhance chemical stability under CO 2 and H 2 O atmospheres 36,37 .…”