High performing Y3H5P6O22 and Er3H5P6O22 proton conductors: preparation and conductivity study.
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| Title: | High performing Y |
|---|---|
| Authors: | Almeida, Carlos M. R.1,2 (AUTHOR), Selevich, Anatoly F.3 (AUTHOR) selevich@bsu.by, Holz, Laura I. V.1,2 (AUTHOR), Loureiro, Francisco J. A.1,2 (AUTHOR) francisco.loureiro@ua.pt, Fagg, Duncan P.1,2 (AUTHOR) duncan@ua.pt |
| Source: | Dalton Transactions: An International Journal of Inorganic Chemistry. 6/9/2026, Vol. 55 Issue 22, p8776-8788. 13p. |
| Subjects: | Solid state proton conductors, Pyrophosphates, Proton transfer reactions, Sintering, Hydrogen bonding interactions, Impedance spectroscopy |
| Abstract: | Two novel trivalent rare-earth mixed-anion phosphates, Y3H5P6O22 (YHPO) and Er3H5P6O22 (EHPO), were synthesised using the thin layer technique (TLT) and processed into dense ceramic electrolytes via the cold sintering process (CSP). Structural characterisation by powder X-ray diffraction confirmed tetragonal symmetry for both compositions, with slight variations in lattice parameters consistent with ionic radius differences between Y3+ and Er3+. Chemical analysis and infrared spectroscopy verified the coexistence of orthophosphate (PO43−) and pyrophosphate (P2O74−) groups in a 1 : 1 molar ratio, forming hydrogen-bonded networks relevant to proton transport. The cold-sintered pellets exhibited high relative densities (>88%) and preserved stoichiometry. Electrochemical impedance spectroscopy performed between 40 °C and 140 °C under controlled wet (pH2O = 0.033 atm) and low humidity (pH2O ∼ 10−5 atm) nitrogen atmospheres revealed humidity-dependent proton conduction. Under wet conditions, two transport regimes were identified: a low-temperature vehicular mechanism associated with surface-adsorbed water and a higher-temperature thermally activated regime consistent with Grotthuss-type proton hopping. EHPO exhibited superior conductivity, reaching 1.47 × 10−4 S cm−1 at 140 °C, nearly one order of magnitude higher than YHPO. Under low humidity, both materials showed reduced conductivity and single Arrhenius-type behaviour with activation energies in the range of 50 kJ mol−1–60 kJ mol−1, indicating dominant structural proton diffusion. The enhanced performance of EHPO is attributed to its slightly more compact lattice, promoting favourable hydrogen-bond connectivity. These findings demonstrate the potential of trivalent rare-earth mixed phosphates as promising intermediate-temperature proton-conducting electrolytes. [ABSTRACT FROM AUTHOR] |
| Copyright of Dalton Transactions: An International Journal of Inorganic Chemistry is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 194430948 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: High performing Y<subscript>3</subscript>H<subscript>5</subscript>P<subscript>6</subscript>O<subscript>22</subscript> and Er<subscript>3</subscript>H<subscript>5</subscript>P<subscript>6</subscript>O<subscript>22</subscript> proton conductors: preparation and conductivity study. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Almeida%2C+Carlos+M%2E+R%2E%22">Almeida, Carlos M. R.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Selevich%2C+Anatoly+F%2E%22">Selevich, Anatoly F.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> selevich@bsu.by</i><br /><searchLink fieldCode="AR" term="%22Holz%2C+Laura+I%2E+V%2E%22">Holz, Laura I. V.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Loureiro%2C+Francisco+J%2E+A%2E%22">Loureiro, Francisco J. A.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> francisco.loureiro@ua.pt</i><br /><searchLink fieldCode="AR" term="%22Fagg%2C+Duncan+P%2E%22">Fagg, Duncan P.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> duncan@ua.pt</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Dalton+Transactions%3A+An+International+Journal+of+Inorganic+Chemistry%22">Dalton Transactions: An International Journal of Inorganic Chemistry</searchLink>. 6/9/2026, Vol. 55 Issue 22, p8776-8788. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Solid+state+proton+conductors%22">Solid state proton conductors</searchLink><br /><searchLink fieldCode="DE" term="%22Pyrophosphates%22">Pyrophosphates</searchLink><br /><searchLink fieldCode="DE" term="%22Proton+transfer+reactions%22">Proton transfer reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Sintering%22">Sintering</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+bonding+interactions%22">Hydrogen bonding interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Impedance+spectroscopy%22">Impedance spectroscopy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Two novel trivalent rare-earth mixed-anion phosphates, Y3H5P6O22 (YHPO) and Er3H5P6O22 (EHPO), were synthesised using the thin layer technique (TLT) and processed into dense ceramic electrolytes via the cold sintering process (CSP). Structural characterisation by powder X-ray diffraction confirmed tetragonal symmetry for both compositions, with slight variations in lattice parameters consistent with ionic radius differences between Y3+ and Er3+. Chemical analysis and infrared spectroscopy verified the coexistence of orthophosphate (PO43−) and pyrophosphate (P2O74−) groups in a 1 : 1 molar ratio, forming hydrogen-bonded networks relevant to proton transport. The cold-sintered pellets exhibited high relative densities (>88%) and preserved stoichiometry. Electrochemical impedance spectroscopy performed between 40 °C and 140 °C under controlled wet (pH2O = 0.033 atm) and low humidity (pH2O ∼ 10−5 atm) nitrogen atmospheres revealed humidity-dependent proton conduction. Under wet conditions, two transport regimes were identified: a low-temperature vehicular mechanism associated with surface-adsorbed water and a higher-temperature thermally activated regime consistent with Grotthuss-type proton hopping. EHPO exhibited superior conductivity, reaching 1.47 × 10−4 S cm−1 at 140 °C, nearly one order of magnitude higher than YHPO. Under low humidity, both materials showed reduced conductivity and single Arrhenius-type behaviour with activation energies in the range of 50 kJ mol−1–60 kJ mol−1, indicating dominant structural proton diffusion. The enhanced performance of EHPO is attributed to its slightly more compact lattice, promoting favourable hydrogen-bond connectivity. These findings demonstrate the potential of trivalent rare-earth mixed phosphates as promising intermediate-temperature proton-conducting electrolytes. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Dalton Transactions: An International Journal of Inorganic Chemistry is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1039/d6dt00496b Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 8776 Subjects: – SubjectFull: Solid state proton conductors Type: general – SubjectFull: Pyrophosphates Type: general – SubjectFull: Proton transfer reactions Type: general – SubjectFull: Sintering Type: general – SubjectFull: Hydrogen bonding interactions Type: general – SubjectFull: Impedance spectroscopy Type: general Titles: – TitleFull: High performing Y3H5P6O22 and Er3H5P6O22 proton conductors: preparation and conductivity study. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Almeida, Carlos M. R. – PersonEntity: Name: NameFull: Selevich, Anatoly F. – PersonEntity: Name: NameFull: Holz, Laura I. V. – PersonEntity: Name: NameFull: Loureiro, Francisco J. A. – PersonEntity: Name: NameFull: Fagg, Duncan P. IsPartOfRelationships: – BibEntity: Dates: – D: 09 M: 06 Text: 6/9/2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 14779226 Numbering: – Type: volume Value: 55 – Type: issue Value: 22 Titles: – TitleFull: Dalton Transactions: An International Journal of Inorganic Chemistry Type: main |
| ResultId | 1 |
