Review: recent progress in low-temperature proton-conducting ceramics
Source abstract
Abstract
Proton-conducting ceramics (PCCs) are of considerable interest for use in energy conversion and storage applications, electrochemical sensors, and separation membranes. PCCs that combine performance, efficiency, stability, and an ability to operate at low temperatures are particularly attractive. This review summarizes the recent progress made in the development of low-temperature proton-conducting ceramics (LT-PCCs), which are defined as operating in the temperature range of 25–400 °C. The structure of these ceramic materials, the characteristics of proton transport mechanisms, and the potential applications for LT-PCCs will be summarized with an emphasis on protonic conduction occurring at interfaces. Three temperature zones are defined in the LT-PCC operating regime based on the predominant proton transfer mechanism occurring in each zone. The variation in material properties, such as crystal structure, conductivity, microstructure, fabrication methods required to achieve the requisite grain size distribution, along with typical strategies pursued to enhance the proton conduction, is addressed. Finally, a perspective regarding applications of these materials to low-temperature solid oxide fuel cells, hydrogen separation membranes, and emerging areas in the nuclear industry including off-gas capture and isotopic separations is presented.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Fuel Cells and Related Materials · Electronic and Structural Properties of Oxides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (100+)
Show source-provided references
1. Fabbri E, Pergolesi D, Traversa E (2010) Materials challenges toward proton-conducting oxide fuel cells: a critical review. Chem Soc Rev 39:4355–4369. https://doi.org/10.1039/b902343g10.1039/b902343g ↗
2. Bi L, Da’as EH, Shafi SP (2017) Proton-conducting solid oxide fuel cell (SOFC) with Y-doped BaZrO3 electrolyte. Electrochem Commun 80:20–23. https://doi.org/10.1016/j.elecom.2017.05.00610.1016/j.elecom.2017.05.006 ↗
3. Shi Z, Sun W, Wang Z et al (2014) Samarium and Yttrium Codoped BaCeO3 proton conductor with improved sinterability and higher electrical conductivity. ACS Appl Mater Interfaces 6:5175–5182. https://doi.org/10.1021/am500467m10.1021/am500467m ↗
4. Wang S, Shen J, Zhu Z et al (2018) Further optimization of barium cerate properties via co-doping strategy for potential application as proton-conducting solid oxide fuel cell electrolyte. J Power Sour 387:24–32. https://doi.org/10.1016/j.jpowsour.2018.03.05410.1016/j.jpowsour.2018.03.054 ↗
5. Hou J, Miao L, Hui J et al (2018) A novel in situ diffusion strategy to fabricate high performance cathode for low temperature proton-conducting solid oxide fuel cells. J Mater Chem A 6:10411–10420. https://doi.org/10.1039/C8TA00859K10.1039/C8TA00859K ↗
6. Clark D, Tong J, Morrissey A et al (2014) Anomalous low-temperature proton conductivity enhancement in a novel protonic nanocomposite. Phys Chem Chem Phys 16:5076–5080. https://doi.org/10.1039/C4CP00468J10.1039/C4CP00468J ↗
7. Xu X, Bi L, Zhao XS (2018) Highly-conductive proton-conducting electrolyte membranes with a low sintering temperature for solid oxide fuel cells. J Membr Sci 558:17–25. https://doi.org/10.1016/j.memsci.2018.04.03710.1016/j.memsci.2018.04.037 ↗
8. Wang B, Liu X, Bi L, Zhao XS (2019) Fabrication of high-performance proton-conducting electrolytes from microwave prepared ultrafine powders for solid oxide fuel cells. J Power Sour 412:664–669. https://doi.org/10.1016/j.jpowsour.2018.11.05110.1016/j.jpowsour.2018.11.051 ↗
9. Xu N, Zhang C, Huang K (2018) Proton-mediated energy storage in intermediate-temperature solid-oxide metal–air batteries. J Mater Chem A 6:20659–20662. https://doi.org/10.1039/C8TA08180H10.1039/C8TA08180H ↗
10. Hübert T, Boon-Brett L, Black G, Banach U (2011) Hydrogen sensors: a review. Sens Actuators B Chem 157:329–352. https://doi.org/10.1016/j.snb.2011.04.07010.1016/j.snb.2011.04.070 ↗
11. Tao Z, Yan L, Qiao J et al (2015) A review of advanced proton-conducting materials for hydrogen separation. Prog Mater Sci 74:1–50. https://doi.org/10.1016/j.pmatsci.2015.04.00210.1016/j.pmatsci.2015.04.002 ↗
12. Kura C, Kunisada Y, Tsuji E et al (2017) Hydrogen separation by nanocrystalline titanium nitride membranes with high hydride ion conductivity. Nat Energy 2:786–794. https://doi.org/10.1038/s41560-017-0002-210.1038/s41560-017-0002-2 ↗
13. Wang H, Wang X, Meng B et al (2018) Perovskite-based mixed protonic–electronic conducting membranes for hydrogen separation: recent status and advances. J Ind Eng Chem 60:297–306. https://doi.org/10.1016/j.jiec.2017.11.01610.1016/j.jiec.2017.11.016 ↗
14. Fang S, Wang S, Brinkman KS, Chen F (2014) A sinteractive Ni–BaZr0.8Y0.2O3−δ composite membrane for hydrogen separation. J Mater Chem A 2:5825–5833. https://doi.org/10.1039/c3ta14777k10.1039/c3ta14777k ↗
15. Liu M, Sun W, Li X et al (2013) High-performance Ni–BaZr0.1Ce0.7Y0.1Yb0.1O3−δ (BZCYYb) membranes for hydrogen separation. Int J Hydrogen Energy 38:14743–14749. https://doi.org/10.1016/j.ijhydene.2013.09.05710.1016/j.ijhydene.2013.09.057 ↗
16. Mukundan R (1999) Tritium conductivity and isotope effect in proton-conducting perovskites. J Electrochem Soc 146:2184–2187. https://doi.org/10.1149/1.139191110.1149/1.1391911 ↗
17. Steele BCH, Heinzel A (2010) Materials for fuel-cell technologies. Nature 414:345–35210.1038/35104620 ↗
18. Wang S, Shen J, Zhu Z et al (2018) Further optimization of barium cerate properties via co-doping strategy for potential application as proton-conducting solid oxide fuel cell electrolyte. J Power Sour 387:24–32. https://doi.org/10.1016/j.jpowsour.2018.03.05410.1016/j.jpowsour.2018.03.054 ↗
19. Zhu Z, Liu B, Shen J et al (2016) La2Ce2O7: a promising proton ceramic conductor in hydrogen economy. J Alloy Compd 659:232–239. https://doi.org/10.1016/j.jallcom.2015.11.04110.1016/j.jallcom.2015.11.041 ↗
20. Zhang Y, Knibbe R, Sunarso J et al (2017) Recent progress on advanced materials for solid-oxide fuel cells operating below 500 °C. Adv Mater 29:1700132–1700164. https://doi.org/10.1002/adma.20170013210.1002/adma.201700132 ↗
21. Marrony M (2016) Proton-conducting ceramics. CRC Press, Baco Raton
22. Kochetova N, Animitsa I, Medvedev D et al (2016) Recent activity in the development of proton-conducting oxides for high-temperature applications. RSC Adv 6:73222–73268. https://doi.org/10.1039/C6RA13347A10.1039/C6RA13347A ↗
23. Wachsman ED, Lee KT (2011) Lowering the temperature of solid oxide fuel cells. Science 334:935–939. https://doi.org/10.1126/science.120409010.1126/science.1204090 ↗
24. Miyoshi S, Akao Y, Kuwata N et al (2014) Low-temperature protonic conduction based on surface protonics: an example of nanostructured yttria-doped zirconia. Chem Mater 26:5194–5200. https://doi.org/10.1021/cm501292310.1021/cm5012923 ↗
25. Shirpour M, Gregori G, Merkle R, Maier J (2011) On the proton conductivity in pure and gadolinium doped nanocrystalline cerium oxide. Phys Chem Chem Phys 13:937–940. https://doi.org/10.1039/C0CP01702G10.1039/C0CP01702G ↗
26. Chiang Y-M, Lavik EB, Kosacki I et al (1996) Defect and transport properties of nanocrystalline CeO2−x. Appl Phys Lett 69:185–187. https://doi.org/10.1063/1.11736610.1063/1.117366 ↗
27. Park HJ, Roh JW (2016) Protonic conduction of nanostructured Y-Doped BaZrO 3. J Nanomater 2016:1–6. https://doi.org/10.1155/2016/875730510.1155/2016/8757305 ↗
28. Miyoshi S, Akao Y, Kuwata N et al (2014) Low-temperature protonic conduction based on surface protonics: an example of nanostructured yttria-doped zirconia. Chem Mater 26:5194–5200. https://doi.org/10.1021/cm501292310.1021/cm5012923 ↗
29. Chiodelli G, Maglia F, Anselmi-Tamburini U, Munir ZA (2009) Characterization of low temperature protonic conductivity in bulk nanocrystalline fully stabilized zirconia. Solid State Ion 180:297–301. https://doi.org/10.1016/j.ssi.2009.02.03110.1016/j.ssi.2009.02.031 ↗
30. Kim S, Avila-Paredes HJ, Wang S et al (2009) On the conduction pathway for protons in nanocrystalline yttria-stabilized zirconia. Phys Chem Chem Phys 11:3035–3038. https://doi.org/10.1039/b901623f10.1039/b901623f ↗
31. Kim S, Anselmi-Tamburini U, Park HJ et al (2008) Unprecedented room-temperature electrical power generation using nanoscale fluorite-structured oxide electrolytes. Adv Mater 20:556–559. https://doi.org/10.1002/adma.20070071510.1002/adma.200700715 ↗
32. Gregori G, Shirpour M, Maier J (2013) Proton conduction in dense and porous nanocrystalline ceria thin films. Adv Funct Mater 23:5861–5867. https://doi.org/10.1002/adfm.20130052710.1002/adfm.201300527 ↗
33. Takamura H, Takahashi N (2010) Electrical conductivity of dense nanocrystalline ceria under humidified atmosphere. Solid State Ion 181:100–103. https://doi.org/10.1016/j.ssi.2009.04.01710.1016/j.ssi.2009.04.017 ↗
34. Avila-Paredes HJ, Zhao J, Wang S et al (2010) Protonic conductivity of nano-structured Yttria-stabilized zirconia: dependence on grain size. J Mater Chem 20:990–994. https://doi.org/10.1039/B919100C10.1039/B919100C ↗
35. Pérez-Coll D, Mather GC (2010) Electrical transport at low temperatures in dense nanocrystalline Gd-doped ceria. Solid State Ion 181:1033–1042. https://doi.org/10.1016/j.ssi.2009.11.01710.1016/j.ssi.2009.11.017 ↗
36. Ruiz-Trejo E, Kilner JA (2009) Possible proton conduction in Ce0.9Gd0.1O2−δ nanoceramics. J Appl Electrochem 39:523–528. https://doi.org/10.1007/s10800-008-9713-110.1007/s10800-008-9713-1 ↗
37. Maglia F, Tredici IG, Spinolo G, Anselmi-Tamburini U (2012) Low temperature proton conduction in bulk nanometric TiO2 prepared by high-pressure field assisted sintering. J Mater Res 27:1975–1981. https://doi.org/10.1557/jmr.2012.15810.1557/jmr.2012.158 ↗
38. Gui D, Zheng T, Xie J et al (2016) Significantly dense two-dimensional hydrogen-bond network in a layered zirconium phosphate leading to high proton conductivities in both water-assisted low-temperature and anhydrous intermediate-temperature regions. Inorg Chem 55:12508–12511. https://doi.org/10.1021/acs.inorgchem.6b0230810.1021/acs.inorgchem.6b02308 ↗
39. Dobrovolsky Y, Leonova L, Nadkhina S, Panina N (1999) Low-temperature proton conductivity in hydrated and nonhydrated tin dioxide. Solid State Ion 119:275–279. https://doi.org/10.1016/S0167-2738(98)00514-110.1016/S0167-2738(98)00514-1 ↗
40. Wei T, Zhang LA, Chen Y et al (2017) Promising proton conductor for intermediate-temperature fuel cells: Li13.9Sr0.1Zn(GeO4)4. Chem Mater 29:1490–1495. https://doi.org/10.1021/acs.chemmater.6b0347110.1021/acs.chemmater.6b03471 ↗
41. Zhou Y, Guan X, Zhou H et al (2016) Strongly correlated perovskite fuel cells. Nature 534:231–234. https://doi.org/10.1038/nature1765310.1038/nature17653 ↗
42. Brunauer S, Emmett PH, Teller E (1938) Adsorption of gases in multimolecular layers. J Am Chem Soc 60:309–319. https://doi.org/10.1021/ja01269a02310.1021/ja01269a023 ↗
43. Langmuir I (1916) the constitution and fundamental properties of solids and liquids. Part I solids. J Am Chem Soc 38:2221–2295. https://doi.org/10.1021/ja02268a00210.1021/ja02268a002 ↗
44. Stub SØ, Vøllestad E, Norby T (2017) Mechanisms of protonic surface transport in porous oxides: example of YSZ. J Phys Chem C 121:12817–12825. https://doi.org/10.1021/acs.jpcc.7b0300510.1021/acs.jpcc.7b03005 ↗
45. Asay DB, Kim SH (2005) Evolution of the adsorbed water layer structure on silicon oxide at room temperature. J Phys Chem B 109:16760–16763. https://doi.org/10.1021/jp053042o10.1021/jp053042o ↗
46. Kreuer K (1999) Aspects of the formation and mobility of protonic charge carriers and the stability of perovskite-type oxides. Solid State Ion 125:285–302. https://doi.org/10.1016/S0167-2738(99)00188-510.1016/S0167-2738(99)00188-5 ↗
47. Kreuer K (1995) H/D isotope effect of proton conductivity and proton conduction mechanism in oxides. Solid State Ion 77:157–162. https://doi.org/10.1016/0167-2738(94)00265-T10.1016/0167-2738(94)00265-T ↗
48. Świerczek K, Skubida W (2017) Optimization of proton conductors for application in solid oxide fuel cell technology. E3S Web Conf 14:01044–01054. https://doi.org/10.1051/e3sconf/2017140104410.1051/e3sconf/20171401044 ↗
49. Nowick A, Vaysleyb A (1997) Isotope effect and proton hopping in high-temperature protonic conductors. Solid State Ion 97:17–26. https://doi.org/10.1016/S0167-2738(97)00081-710.1016/S0167-2738(97)00081-7 ↗
50. Bonanos N, Huijser A, Poulsen FW (2015) H/D isotope effects in high temperature proton conductors. Solid State Ion 275:9–13. https://doi.org/10.1016/j.ssi.2015.03.02810.1016/j.ssi.2015.03.028 ↗
51. Uchida H (1989) Formation of protons in SrCeO3-based proton conducting oxides. Part II. Evaluation of proton concentration and mobility in Yb-doped SrCeO3. Solid State Ion 36:89–95. https://doi.org/10.1016/0167-2738(89)90065-910.1016/0167-2738(89)90065-9 ↗
52. Bonanos N (2001) Oxide-based protonic conductors: point defects and transport properties. Solid State Ion 145:265–274. https://doi.org/10.1016/S0167-2738(01)00951-110.1016/S0167-2738(01)00951-1 ↗
53. Nowick A (1995) High-temperature protonic conductors with perovskite-related structures. Solid State Ion 77:137–146. https://doi.org/10.1016/0167-2738(94)00230-P10.1016/0167-2738(94)00230-P ↗
54. Kreuer KD, Adams S, Münch W et al (2001) Proton conducting alkaline earth zirconates and titanates for high drain electrochemical applications. Solid State Ion 145:295–306. https://doi.org/10.1016/S0167-2738(01)00953-510.1016/S0167-2738(01)00953-5 ↗
55. Yamazaki Y, Babilo P, Haile SM (2008) Defect chemistry of Yttrium-doped barium zirconate: a thermodynamic analysis of water uptake. Chem Mater 20:6352–6357. https://doi.org/10.1021/cm800843s10.1021/cm800843s ↗
56. Haile SM, Staneff G, Ryu KH (2001) Non-stoichiometry, grain boundary transport and chemical stability of proton conducting perovskites. J Mater Sci 36:1149–1160. https://doi.org/10.1023/A:100487770887110.1023/A:1004877708871 ↗
57. Kreuer KD (2003) Proton-conducting oxides. Ann Rev Mater Res 33:333–359. https://doi.org/10.1146/annurev.matsci.33.022802.09182510.1146/annurev.matsci.33.022802.091825 ↗
58. Uchida H (1983) Relation between proton and hole conduction in SrCeO3-based solid electrolytes under water-containing atmospheres at high temperatures. Solid State Ion 11:117–124. https://doi.org/10.1016/0167-2738(83)90048-610.1016/0167-2738(83)90048-6 ↗
59. Malavasi L, Fisher CAJ, Islam MS (2010) Oxide-ion and proton conducting electrolyte materials for clean energy applications: structural and mechanistic features. Chem Soc Rev 39:4370–4387. https://doi.org/10.1039/b915141a10.1039/b915141a ↗
60. Bielecki J, Parker SF, Mazzei L et al (2016) Structure and dehydration mechanism of the proton conducting oxide Ba2In2O5(H2O)x. J Mater Chem A 4:1224–1232. https://doi.org/10.1039/C5TA05728K10.1039/C5TA05728K ↗
61. Avila-Paredes HJ, Barrera-Calva E, Anderson HU et al (2010) Room-temperature protonic conduction in nanocrystalline films of yttria-stabilized zirconia. J Mater Chem 20:6235–6238. https://doi.org/10.1039/c0jm00051e10.1039/c0jm00051e ↗
62. Guo X (1999) On the degradation of zirconia ceramics during low-temperature annealing in water or water vapor. J Phys Chem Solids 60:539–546. https://doi.org/10.1016/S0022-3697(98)00301-110.1016/S0022-3697(98)00301-1 ↗
63. Anselmi-Tamburini U, Maglia F, Chiodelli G et al (2006) Enhanced low-temperature protonic conductivity in fully dense nanometric cubic Zirconia. Appl Phys Lett 89:163116–163118. https://doi.org/10.1063/1.236093410.1063/1.2360934 ↗
64. Miyoshi S, Akao Y, Kuwata N et al (2012) Water uptake and conduction property of nano-grained yttria-doped zirconia fabricated by ultra-high pressure compaction at room temperature. Solid State Ion 207:21–28. https://doi.org/10.1016/j.ssi.2011.11.01410.1016/j.ssi.2011.11.014 ↗
65. Jing Y, Matsumoto H, Aluru NR (2018) Mechanistic insights into hydration of solid oxides. Chem Mater 30:138–144. https://doi.org/10.1021/acs.chemmater.7b0347610.1021/acs.chemmater.7b03476 ↗
66. Tret’yakov NE, Filimonov VN (1972) Relative proton-donor capacity of hydroxyl groups of surface oxides studied by an ir-spectroscopic method. Kinet Katal 13:815–823
67. Holmes HF, Fuller EL, Gammage RB (1972) Heats of immersion in the zirconium oxide-water system. J Phys Chem 76:1497–1502. https://doi.org/10.1021/j100654a02310.1021/j100654a023 ↗
68. Yamada M, Wei M, Honma I, Zhou H (2006) One-dimensional proton conductor under high vapor pressure condition employing titanate nanotube. Electrochem Commun 8:1549–1552. https://doi.org/10.1016/j.elecom.2006.07.02010.1016/j.elecom.2006.07.020 ↗
69. Iwahara H, Esaka T, Uchida H, Maeda N (1981) Proton conduction in sintered oxides and its application to steam electrolysis for hydrogen production. Solid State Ion 3–4:359–363. https://doi.org/10.1016/0167-2738(81)90113-210.1016/0167-2738(81)90113-2 ↗
70. Norby T (1999) Solid-state protonic conductors: principles, properties, progress and prospects. Solid State Ion 125:1–11. https://doi.org/10.1016/S0167-2738(99)00152-610.1016/S0167-2738(99)00152-6 ↗
71. Iwahara H (1996) Proton conducting ceramics and their applications. Solid State Ion 86–88:9–15. https://doi.org/10.1016/0167-2738(96)00087-210.1016/0167-2738(96)00087-2 ↗
72. Haile SM, West DL, Campbell J (1998) The role of microstructure and processing on the proton conducting properties of gadolinium-doped barium cerate. J Mater Res 13:1576–1595. https://doi.org/10.1557/JMR.1998.021910.1557/JMR.1998.0219 ↗
73. Christie G (1996) Microstructure: ionic conductivity relationships in ceria-gadolinia electrolytes. Solid State Ion 83:17–27. https://doi.org/10.1016/0167-2738(95)00155-710.1016/0167-2738(95)00155-7 ↗
74. Nafe H (1984) Ionic conductivity of ThO2- and ZrO2-based electrolytes between 300 and 2000 K. Solid State Ion 13:255–263. https://doi.org/10.1016/0167-2738(84)90040-710.1016/0167-2738(84)90040-7 ↗
75. Braun A, Duval S, Ried P et al (2009) Proton diffusivity in the BaZr0.9Y0.1O3−δ proton conductor. J Appl Electrochem 39:471–475. https://doi.org/10.1007/s10800-008-9667-310.1007/s10800-008-9667-3 ↗
76. Shirpour M, Merkle R, Lin CT, Maier J (2012) Nonlinear electrical grain boundary properties in proton conducting Y-BaZrO3 supporting the space charge depletion model. Phys Chem Chem Phys 14:730–740. https://doi.org/10.1039/C1CP22487E10.1039/C1CP22487E ↗
77. Kjølseth C, Fjeld H, Prytz Ø et al (2010) Space–charge theory applied to the grain boundary impedance of proton conducting BaZr0.9Y0.1O3−δ. Solid State Ion 181:268–275. https://doi.org/10.1016/j.ssi.2010.01.01410.1016/j.ssi.2010.01.014 ↗
78. Park HJ, Kwak C, Lee KH et al (2009) Interfacial protonic conduction in ceramics. J Eur Ceram Soc 29:2429–2437. https://doi.org/10.1016/j.jeurceramsoc.2009.02.01010.1016/j.jeurceramsoc.2009.02.010 ↗
79. Guo X, Waser R (2006) Electrical properties of the grain boundaries of oxygen ion conductors: acceptor-doped zirconia and ceria. Prog Mater Sci 51:151–210. https://doi.org/10.1016/j.pmatsci.2005.07.00110.1016/j.pmatsci.2005.07.001 ↗
80. Kliewer KL, Koehler JS (1965) Space charge in ionic crystals. I. General approach with application to NaCl. Phys Rev 140:A1226–A1240. https://doi.org/10.1103/PhysRev.140.A122610.1103/PhysRev.140.A1226 ↗
81. Guo X, Maier J (2001) Grain boundary blocking effect in Zirconia: a Schottky barrier analysis. J Electrochem Soc 148:E121–E126. https://doi.org/10.1149/1.134826710.1149/1.1348267 ↗
82. Lee JS, Anselmi-Tamburini U, Munir ZA, Kim S (2006) Direct evidence of electron accumulation in the grain boundary of yttria-doped nanocrystalline Zirconia ceramics. Electrochem Solid-State Lett 9:J34–J36. https://doi.org/10.1149/1.220801210.1149/1.2208012 ↗
83. De Souza RA, Pietrowski MJ, Anselmi-Tamburini U et al (2008) Oxygen diffusion in nanocrystalline yttria-stabilized zirconia: the effect of grain boundaries. Phys Chem Chem Phys 10:2067. https://doi.org/10.1039/b719363g10.1039/b719363g ↗
84. Tschöpe A (2001) Grain size-dependent electrical conductivity of polycrystalline cerium oxide II: space charge model. Solid State Ion 139:267–280. https://doi.org/10.1016/S0167-2738(01)00677-410.1016/S0167-2738(01)00677-4 ↗
85. Kim S, Fleig J, Maier J (2003) Space charge conduction: simple analytical solutions for ionic and mixed conductors and application to nanocrystalline ceria. Phys Chem Chem Phys 5:2268–2273. https://doi.org/10.1039/B300170A10.1039/B300170A ↗
86. Iwahara H, Yajima T, Hibino T et al (1993) Protonic conduction in calcium, strontium and barium zirconates. Solid State Ion 61:65–69. https://doi.org/10.1016/0167-2738(93)90335-Z10.1016/0167-2738(93)90335-Z ↗
87. Yajima T, Suzuki H, Yogo T, Iwahara H (1992) Protonic conduction in SrZrO3-based oxides. Solid State Ion 51:101–107. https://doi.org/10.1016/0167-2738(92)90351-O10.1016/0167-2738(92)90351-O ↗
88. Yajima T, Kazeoka H, Yogo T, Iwahara H (1991) Proton conduction in sintered oxides based on CaZrO3. Solid State Ion 47:271–275. https://doi.org/10.1016/0167-2738(91)90249-B10.1016/0167-2738(91)90249-B ↗
89. Münch W, Kreuer KD, Adams et al (1999) The relation between crystal structure and the formation and mobility of protonic charge carriers in perovskite-type oxides: a case study of Y-doped BaCeO3 and SrCeO3. Phase Trans 68:567–586. https://doi.org/10.1080/0141159990822453510.1080/01411599908224535 ↗
90. Singh K, Kannan R, Thangadurai V (2016) Synthesis and characterisation of ceramic proton conducting perovskite-type multi-element-doped Ba0.5Sr0.5Ce1−x−y−zZrxGdyYzO3−δ (0 < x < 0.5; y = 0, 0.1, 0.15; z = 0.1, 0.2). Int J Hydrogen Energy 41:13227–13237. https://doi.org/10.1016/j.ijhydene.2016.05.08910.1016/j.ijhydene.2016.05.089 ↗
91. Corcoran DJ, Irvine JT (2001) Investigations into Sr3CaZr0.5Ta1.5O8.75, a novel proton conducting perovskite oxide. Solid State Ion 145:307–313. https://doi.org/10.1016/S0167-2738(01)00955-910.1016/S0167-2738(01)00955-9 ↗
92. Ahmed I, Eriksson S, Ahlberg E et al (2006) Synthesis and structural characterization of perovskite type proton conducting BaZr1−xInxO3−δ (0.0 ≤ x ≤ 0.75). Solid State Ion 177:1395–1403. https://doi.org/10.1016/j.ssi.2006.07.00910.1016/j.ssi.2006.07.009 ↗
93. Ding H, Lin B, Fang D et al (2009) BaZr0.1Ce0.7Y0.2O3−δ proton-conducting electrolyte prepared by gel-casting for low-temperature solid oxide fuel cells. J Alloy Compd 474:364–369. https://doi.org/10.1016/j.jallcom.2008.06.10610.1016/j.jallcom.2008.06.106 ↗
94. Khani Z, Taillades-Jacquin M, Taillades G et al (2009) New synthesis of nanopowders of proton conducting materials. A route to densified proton ceramics. J Solid State Chem 182:790–798. https://doi.org/10.1016/j.jssc.2008.12.02010.1016/j.jssc.2008.12.020 ↗
95. Ahmed I, Kinyanjui FG, Steegstra P et al (2010) Improved proton conductivity in spark-plasma sintered dense ceramic BaZr0.5In0.5O3−δ. Electrochem Solid State Lett 13:B130–B134. https://doi.org/10.1149/1.348201610.1149/1.3482016 ↗
96. Barison S, Battagliarin M, Cavallin T et al (2008) Barium non-stoichiometry role on the properties of Ba1+xCe0.65Zr0.20Y0.15O3−δ proton conductors for IT-SOFCs. Fuel Cells 8:360–368. https://doi.org/10.1002/fuce.20080002110.1002/fuce.200800021 ↗
97. Świerczek K, Skubida W, Niemczyk A et al (2017) Structure and transport properties of proton-conducting BaSn0.5In0.5O2.75 and A-site substituted Ba0.9Ln0.1Sn0.5In0.5O2.8 (Ln = La, Gd) oxides. Solid State Ion 307:44–50. https://doi.org/10.1016/j.ssi.2017.05.01010.1016/j.ssi.2017.05.010 ↗
98. Świerczek K, Zając W, Klimkowicz A et al (2015) Crystal structure and proton conductivity in highly oxygen-deficient Ba1−xLax(In, Zr, Sn)O3−δ perovskites. Solid State Ion 275:58–61. https://doi.org/10.1016/j.ssi.2015.02.01810.1016/j.ssi.2015.02.018 ↗
99. Bohn HG, Schober T (2000) Electrical conductivity of the high-temperature proton conductor BaZr0.9Y0.1O2.95. J Am Ceram Soc 83:768–772. https://doi.org/10.1111/j.1151-2916.2000.tb01272.x10.1111/j.1151-2916.2000.tb01272.x ↗
100. Iguchi F, Sata N, Tsurui T, Yugami H (2007) Microstructures and grain boundary conductivity of BaZr1−xYxO3 (x = 0.05, 0.10, 0.15) ceramics. Solid State Ion 178:691–695. https://doi.org/10.1016/j.ssi.2007.02.01910.1016/j.ssi.2007.02.019 ↗