Electrocatalytic activity and stability of La1–xCaxCoO3 perovskite-type oxides in alkaline medium

Sol-gel preparation and characterization of non-substituted and Sr-substituted lanthanum cobaltates

“…They have high electron and ionic (O 2-) conductivities and are considered for use as cathode materials in solid oxide fuel cells, oxygen permeable membranes and are effective in catalytic oxidation of CO and hydrocarbons. The amount of charge carriers and thus the electrical conductivity and thermoelectric properties in this system can be tuned by suitable Cosite and La-site substitution [13][14][15][16][17][18][19][20][21][22]. There has been substantial recent interest in strontium-doped rare earth perovskites (Ln 1-x Sr x CoO 3-δ ) as cathode materials for solid oxide fuels cells [19,[23][24][25][26][27][28], as an ideal substrate for the deposition of lead zirconium titanate (PZT) films [29], and as high temperature ceramic membranes [30][31][32].…”

“…For the preparation of bulk lanthanum cobaltate ceramics, different methods, such as solid state [50][51][52], co-precipitation [53,54], spray-pyrolysis [55], microemulsion [56], combustion [19,57,58] and reactive grinding [59] techniques could be used. Sol-gel chemistry routes using citric acid [18], EDTA [60] and glycine [61] as complexing agents were also suggested for the preparation of LaCoO 3 -based ceramics. Recently for the preparation of different garnets, aluminates and superconductors, we elaborated an aqueous glycolate sol-gel processing route [62][63][64][65][66][67].…”

Effect of La doping on the electrochemical activity of double perovskite oxide Sr2FeMoO6 in alkaline medium

“…The latter, related to the variation of electrical resistivity when a magnetic field is applied, is a consequence of the half-metallic character of the mentioned double perovskite. Depending on the synthesis conditions, the crystal structure of SFMO can be cubic or tetragonal [15], where there is regular arrangement of corner-sharing FeO 6 and MoO 6 octahedra. The perfect alternating order of Fe and Mo ions in the octahedral sites promotes the equilibrium reaction Fe(III) + Mo(V) ⇔ Fe(II) + Mo(VI) in which the itinerant minority spin electron is shared by both types of atoms.…”

“…They are most important processes in many electrochemical devices such as metal-air batteries [3], fuel cells [4] and water electrolysers [5]. Perovskite oxides of the general formula ABO 3 are an important class of materials that has been extensively studied as electrocatalysts not only for the oxygen evolution [6] but for its reduction as well [7,8], and can thus be used simultaneously as bifunctional electrode [9]. So far, both unsubstituted (ABO 3 ) and substituted (A 1−x A x BO 3 , AB 1−y B y O 3 , etc.)…”

Onset potential determination at gas-evolving catalysts by means of constant-distance mode positioning of nanoelectrodes

“…Recently, perovskites were described as non-noble metal alternative for OER catalysts [6][7][8][9] showing a comparably low price and low overvoltages [8,[10][11][12][13]]. …”