Proton Transport in the Gadolinium-Doped Layered Perovskite BaLaInO4

Abstract

Materials capable for use in energy generation have been actively investigated recently. Thermoelectrics, photovoltaics and electronic/ionic conductors are considered as a part of the modern energy system. Layered perovskites have many attractions, as materials with high conductivity. Gadolinium-doped layered perovskite BaLaInO4 was obtained and investigated for the first time. The high values of conductivity were proved. The composition BaLa0.9Gd0.1InO4 demonstrates predominantly protonic transport under wet air and low temperatures (<400 °C). The doping by rare earth metals of layered perovskite is a prospective method for significantly improving conductivity.

Layered Perovskites BaLnnInnO3n+1 (n = 1, 2) for Electrochemical Applications: A Mini Review

“…However, some features can be highlighted. Firstly, the increase in the conductivity values for the monolayer BaLaInO 4 [ 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 ] and BaNdInO 4 [ 70 , 72 , 73 , 84 , 85 , 86 ] compositions is more significant than for the two-layer BaLa 2 In 2 O 7 [ 74 , 87 , 88 , 89 , 90 ] and BaNd 2 In 2 O 7 [ 75 , 91 ] compositions (~1.5 vs. ~1. order of magnitude).…”

“…The possibility of isovalent doping was proved for the monolayer and two-layer La-containing composition. The compositions with the doping of the La-sublattice BaLa 0.9 Gd 0.1 InO 4 [ 81 ], BaLa 0.9 Nd 0.1 InO 4 [ 82 ], BaLa 2– x Gd x In 2 O 7 0 ≤ x ≤ 0.15 [ 90 ] and In-sublattice BaLaIn 0.9 Sc 0.1 O 4 [ 79 ], BaLaIn 1− x Y x O 4 (0 ≤ x ≤ 0.5) [ 80 ] were obtained and investigated.…”

A Review on Low-Temperature Protonic Conductors: Principles and Chemical Sensing Applications

“…The authors noted a high efficiency of electrical energy storage and a kW/h cost similar to that required by pumped hydro technologies. Tarasova and collaborators [148,150,151] produced layered perovskites based on rare-earth-doped BaLaInO 4 , using barium carbonate (BaCO 3 ), indium(III) oxide (In 2 O 3 ) and lanthanum(III) oxide (La 2 O 3 ) as primary reactants. The novel proton-conducting materials, neodymium (Nd)-, praseodymium (Pr)-, and gadolinium (Gd)-doped BaLaInO 4 are presented as potential proton-conducting fuel cells.…”

Synthesis, Hydration Processes and Ionic Conductivity of Novel Gadolinium-Doped Ceramic Materials Based on Layered Perovskite BaLa2In2O7 for Electrochemical Purposes

“…The protonic conductivities of these materials, such as BaNdInO 4 [28][29][30][31][32], SrLaInO 4 [33][34][35][36][37], BaNdScO 4 [38], BaLaInO 4 , is realized due to the possibility of dissociative water intercalation into the interlayer space of the layered structure. The monolayer barium-lanthanum indate BaLaInO 4 was described as a nearly pure proton conductor below 400 • C, and an increase in the conductivity values up to 1.5 orders of magnitude caused by heterovalent [39][40][41][42] and isovalent [43][44][45][46] doping was revealed. The two-layer composition BaLa 2 In 2 O 7 of this homologous series AA' n B n O 3n+1 was also described as a protonic conductor [47].…”