Microstructure and electrical relaxation studies of chemically derived Gd–Nd co-doped nanocrystalline ceria electrolytes

Ionic conductivity in multiply substituted ceria-based electrolytes

“…xNdxO1.95 (0 ≤ x ≤ 0.1) prepared by citrate-nitrate auto-ignition, was 6.82 x 10 -3 S m -1 when x = 0.075, which is significantly lower than the value of 0.635 S m -1 obtained here for the co-doped sample, GN, at the same temperature. [20] This is likely to be due to both the difference in dopant ratios (although they also report a value of 1.96 x 10 -3 S m -1 at 550 °C for x = 0.05) and the difference in total dopant concentration: 10 % used by these authors and 20 % in the current study. [20]…”

“…[20] This is likely to be due to both the difference in dopant ratios (although they also report a value of 1.96 x 10 -3 S m -1 at 550 °C for x = 0.05) and the difference in total dopant concentration: 10 % used by these authors and 20 % in the current study. [20]…”

“…Anirban and co-workers observed that ceria co-doped with Gd 3+ and Nd 3+ exhibited a slight increase in bulk conductivity and a more significant increase in grain boundary conductivity compared to the singly doped specimens with the same dopant concentration with the effect of co-doping increasing at 600 °C and above. [20] Liu and coworkers found that, of all the Sm 3+ and Nd 3+ co-doped and singly doped compositions investigated, the highest total ionic conductivity was observed for Ce0.8Sm0.1Nd0.1O1.9. [21] These studies show that co-doping can have beneficial effects on the conductivity of ceria-based electrolytes.…”

Influence of particle size on H 2 and H 2 S sensing characteristics of nanocrystalline nickel ferrite

“…The electrical measurements were performed in tube furnace with two probe arrangement in the frequency range 42 Hz ˗ 5 MHz. The presence of single semicircle indicates contribution of grain boundary is much lower than that for grains [28]. In other words, if we analyze impedance spectrum, it is noticeable that we get effect due to grain interior only in the analyzed frequency range.…”

Boosting the Performance of Solid Oxide Electrolysis Cells via Incorporation of Gd3+ and Nd3+ Double‐doped Ceria▴

“…The resultant Nyquist plots of GNDC and GDC are shown in Figure S1. Preliminarily, we compared GNDC samples with different total dopant concentrations (10,15,18, and 20%). The s total of GNDC with total dopant concentration of 15 mol.% (Gd:Nd = 3:2) showed the highest ionic conductivity values at all test temperatures ( Figure S2).…”