Solid oxide proton conductors beyond perovskites

Fop, Sacha

doi:10.1039/d1ta03499e

Cited by 50 publications

(37 citation statements)

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“…Although, other classes of oxides (Ruddlesden–Popper, double perovskite, fergusonite/scheelite structures) also display proton transport, they concede to perovskite-structured phases in terms of achieving both high absolute levels and contributions of proton conductivity. 29,30 Due to this fact, BaCeO 3 , BaZrO 3 or their solid solutions (BaCeO 3 –BaZrO 3 or Ba(Ce,Zr)O 3 ) represent the most frequently-used basic oxides 31–36 for designing electrolyte membranes used in protonic ceramic fuel cells (PCFCs), protonic ceramic electrolysis cells (PCECs), protonic ceramic converters (PCCs), protonic ceramic pumps (PCPs), and protonic ceramic sensors (PCSs). As can be seen from Fig.…”

Section: Introductionmentioning

confidence: 99%

Electrochemistry and energy conversion features of protonic ceramic cells with mixed ionic-electronic electrolytes

Zvonareva

Medvedev

et al. 2022

Energy Environ. Sci.

142

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Section: Introductionmentioning

confidence: 99%

Electrochemistry and energy conversion features of protonic ceramic cells with mixed ionic-electronic electrolytes

Zvonareva

Medvedev

et al. 2022

Energy Environ. Sci.

142

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“…It is known that proton transport in oxides, occurring according to the Grotthuss mechanism, is characterized by activation energies of ~0.5 eV. These values are typical for many perovskites and related structures, the comparison of activation energies E a of proton conductivity for various structures is presented in [ 49 ]. It should be emphasized that proton transport in hexagonal perovskites with general formula Ba 5 M 3+ 2 Al 2 ZrO 13 is realized with lower activation energies.…”

Section: Resultsmentioning

confidence: 99%

Proton and Oxygen-Ion Conductivities of Hexagonal Perovskite Ba5In2Al2ZrO13

et al. 2022

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The hexagonal perovskite Ba5In2Al2ZrO13 and In3+-doped phase Ba5In2.1Al2Zr0.9O12.95 were prepared by the solid-state synthesis method. The introduction of indium in the Zr-sublattice was accompanied by an increase in the unit cell parameters: a = 5.967 Å, c = 24.006 Å vs. a = 5.970 Å, c = 24.011 Å for doped phase (space group of P63/mmc). Both phases were capable of incorporating water from the gas phase. The ability of water incorporation was due to the presence of oxygen deficient blocks in the structure, and due to the introduction of oxygen vacancies during doping. According to thermogravimetric (TG) measurements the compositions of the hydrated samples corresponded to Ba5In2Al2ZrO12.7(OH)0.6 and Ba5In2.1Al2Zr0.9O12.54(OH)0.82. The presence of different types of OH−-groups in the structure, which participate in different hydrogen bonds, was confirmed by infrared (IR) investigations. The measurements of bulk conductivity by the impedance spectroscopy method showed that In3+-doping led to an increase in conductivity by 0.5 order of magnitude in wet air (pH2O = 1.92·10−2 atm); in this case, the activation energies decreased from 0.27 to 0.19 eV. The conductivity−pO2 measurements showed that both the phases were dominant proton conductors at T < 500 °C in wet conditions. The composition Ba5In2.1Al2Zr0.9O12.95 exhibited a proton conductivity ~10−4 S·cm−1 at 500 °C. The analysis of partial (O2−, H+, h•) conductivities of the investigated phases has been carried out. Both phases in dry air (pH2O = 3.5·10−5 atm) showed a mixed (oxygen-ion and hole) type of conductivity. The obtained results indicated that the investigated phases of Ba5In2Al2ZrO13 and Ba5In2.1Al2Zr0.9O12.95 might be promising proton-conducting oxides in the future applications in electrochemical devices, such as solid oxide fuel cells. Further modification of the composition and search for the optimal dopant concentrations can improve the H+-conductivity.

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“…124 Recently solid oxides with ABO3 perovskite structures became key substances for enhancing hydrogen storage properties. 126 It was shown that porous NiTiO3 and CoTiO3 nanorods can decrease the dehydrogenation temperature of MgH2 and provide faster hydrogen desorption (Tdes = 261.5•C and Tdes = 298•C for NiTiO3 and CoTiO3, respectively). 127 Other mixed oxides such as NiMoO4 and CoMoO4 nanorods similarly enhance the non-isothermal and the isothermal desorption performance of magnesium hydride.…”

Section: Small Inorganic/organic Moleculesmentioning

confidence: 99%

Materials Research Directions Towards a Green Hydrogen Economy: A Review

Baum

Diaz

Konovalova

et al. 2022

Preprint

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A constellation of technologies have been researched with an eye towards enabling a hydrogen economy. Within the research fields of hydrogen production, storage, and utilization in fuel cells, various classes of materials have been developed targeting higher efficiencies and utility. This Review examines recent progress in these research fields from the years 2011-2021, exploring the concepts and materials directions important to each. Particular attention has been given to catalyst materials enabling the green production of hydrogen from water, chemical and physical storage systems, and materials used in technical capacities within fuel cells. Quantification of publication and materials trends provides a picture of the current state of development within each node of the hydrogen economy.

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Solid oxide proton conductors beyond perovskites

Abstract: Solid oxide proton conductors are crucially emerging as key materials for enabling hydrogen-based energy conversion, storage, and electrochemical technologies. Oxides crystallising in the ideal ABO3 perovskite structure, such as barium...

Cited by 50 publications

References 288 publications

Electrochemistry and energy conversion features of protonic ceramic cells with mixed ionic-electronic electrolytes

Electrochemistry and energy conversion features of protonic ceramic cells with mixed ionic-electronic electrolytes

Proton and Oxygen-Ion Conductivities of Hexagonal Perovskite Ba5In2Al2ZrO13

Materials Research Directions Towards a Green Hydrogen Economy: A Review

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