An investigation on strontium doped Sm2NiO4+δ cathode for intermediate temperature solid oxide fuel cells

Influence of the crystalline phase on the electrocatalytic behaviour of Sm2−xSrxNiO4−δ (x = 0.4 to 1.0) Ruddlesden–Popper-based systems: a comparative study of bulk and thin electrocatalysts

“…1(c). The XRD patterns reveal the phase conversion with x and this is in accordance with the results reported previously 32 that phase conversion from orthorhombic to tetragonal takes place around x = 0.7. This structural change with Sr substitution occurs due to the displacement of atoms from their regular lattice positions as the bond length has altered from 1.8891 Å to 1.8925 Å in the orthorhombic phase.…”

“…Ruddlesden-Popper perovskites (RP perovskites) have shown electrocatalytic properties along with excellent performance in oxygen-solid oxide fuel cells and hydrogen-solid oxide fuel cells. 32 Their performance are basically attributed to fast surface oxygen exchange property and proton and oxygen transport mechanisms. The oxygen transport is basically occurring via the following mechanisms: interstitial mechanism, interstitialcy mechanism and vacancy diffusion mechanism.…”

“…The crystal structure, conductivity, TEC and ion transport can be specially regulated by doping the chemical element composition of simple RP perovskites. 32 The OER mechanism of RP perovskites is more complex and, therefore, the effect of the defect chemistry and transport property on the ORR kinetics should be studied.…”

“…An extensive literature survey reveals that compositional variation on the kinetics of the OER of Ruddlesden-Popper layered structured oxides is least investigated and Sm 2Àx Sr x NiO 4Àd is least studied for their catalytic mechanisms at the triple-phase boundary. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] In order to understand the insight mechanism of electrocatalytic behaviours with phase and dimension, we have studied the compositional effect along with the studies in a thin film form. For this, we synthesized Sm 2Àx Sr x NiO 4Àd (x = 0.2, 0.4, 0.6, 0.8 and 1.0) via conventional solid-state reaction routes to form two structures, namely, tetragonal and orthorhombic with the change in oxygen stoichiometry.…”

Fabrication and electrochemical performance of La 0 : 595 V 0 : 005 Sr 0 : 4 MnO 3

“…However, with the decrease in operation temperature, a semicircle associated with the migration of oxide ions through the grain boundary of the GDC electrolyte also appeared in the high-frequency range. 57 The experimental impedance spectra, simulated response, and electrical equivalent circuit models are shown in Figure 7. The simulated curve (solid line obtained from the electrical equivalent model) fits well with the experimental data.…”