La2NiO4+δ as oxygen electrode in reversible solid oxide cells

Impact of Oxygen Deficiency on the Electrochemical Performance of K2NiF4‐Type (La1−xSrx)2NiO4−δ Oxygen Electrodes

“…Lanthanum nickelate La 2 NiO 4+ +d with ap erovskite-related K 2 NiF 4 -type structure possessesacomparatively high electronic conductivity, [1][2][3][4][5] high oxygen diffusivity and surface exchange kinetics, [4][5][6][7][8][9][10] and moderate thermal and low chemical expansion, [3,5,[11][12][13] and is, therefore, considered as ap romising mixed ionic-electronic conductor (MIEC) for high-temperature electrochemical applications, such as dense MIEC membranes for oxygen separation [4,14,15] and oxygen electrodes for solid oxide fuel/electrolysis cells (SOFC/SOEC). [3,9,[16][17][18][19][20] Good electronic transport Scm À1 at 800 8Ci na ir) [1][2][3][4][5]21] is provided by the mixed 2+ +/3+ + oxidation state of the Ni cations in the perovskite layers of the Ruddlesden-Popper K 2 NiF 4 -type structure whereas ionic transport in La 2 NiO 4+ +d occurs predominantly through the migration of interstitial oxygen in rock-salt-type LaO layers. [22][23][24][25][26] At ambient temperature, the symmetry of the La 2 NiO 4+ +d crystal lattice depends on the level of frozen-in oxygen overstoichiometry d. [27][28][29] Above~450 8C, the equilibrium oxygen excess decreases ...…”

REBaCo2O5+δ (RE = Pr, Nd, and Gd) as promising oxygen electrodes for intermediate-temperature solid oxide electrolysis cells

“…This is because MIECs can accelerate the oxygen evolution reaction (OER) in the oxygen electrodes of the SOECs, further increasing the active area. [11][12][13] In addition, research on MIEC oxygen electrode materials with perovskite-type structures such as La 1Àx Sr x Co 1Ày Fe y O 3Àd (LSCF), [14][15][16] Ba 1Àx Sr x Co 1Ày Fe y O 3Àd (BSCF) 17,18 and SrCo 0.7 Fe 0.2 Nb 0.1 O 3Àd (SCFN), 19 and K 2 NiF 4Àd -type structures (rst member of the so-called Ruddlesden-Popper series) such as La 2 NiO 4+d , 20,21 Pr 2 NiO 4+d (ref. [22][23][24] and Nd 2 NiO 4+d (ref.…”

Investigation of Effect of Al3+-Doping on Mass/Charge Transport Properties of La2NiO4+δby Blocking Cell Method

“…[5][6][7][8] However, they also have oxide-ion conductivity which is an order of magnitude higher than conventional perovskite-type oxides and comparable to that of yttria-stabilized zirconia 3,[9][10][11] and which is attributed to a complex mechanism involving interstitial migration in the rock salt layers and vacancy migration in the perovskite planes. [13][14][15][16][17][18] The effect of oxygen hyper-stoichiometry on the thermodynamic properties of LNO systems have been widely studied. [13][14][15][16][17][18] The effect of oxygen hyper-stoichiometry on the thermodynamic properties of LNO systems have been widely studied.…”