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A fast ceramic mixed OH-/H+ ionic conductor for low temperature fuel cells.
Zou, Peimiao; Iuga, Dinu; Ling, Sanliang; Brown, Alex J; Chen, Shigang; Zhang, Mengfei; Han, Yisong; Fortes, A Dominic; Howard, Christopher M; Tao, Shanwen.
Afiliación
  • Zou P; School of Engineering, University of Warwick, Coventry, CV4 7AL, UK.
  • Iuga D; Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.
  • Ling S; Advanced Materials Research Group, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK.
  • Brown AJ; School of Engineering, University of Warwick, Coventry, CV4 7AL, UK.
  • Chen S; School of Engineering, University of Warwick, Coventry, CV4 7AL, UK.
  • Zhang M; School of Engineering, University of Warwick, Coventry, CV4 7AL, UK.
  • Han Y; Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.
  • Fortes AD; ISIS Neutron and Muon Spallation Source, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton, Oxfordshire, OX11 0QX, UK.
  • Howard CM; ISIS Neutron and Muon Spallation Source, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton, Oxfordshire, OX11 0QX, UK.
  • Tao S; School of Engineering, University of Warwick, Coventry, CV4 7AL, UK. S.Tao.1@warwick.ac.uk.
Nat Commun ; 15(1): 909, 2024 Jan 30.
Article en En | MEDLINE | ID: mdl-38291342
ABSTRACT
Low temperature ionic conducting materials such as OH- and H+ ionic conductors are important electrolytes for electrochemical devices. Here we show the discovery of mixed OH-/H+ conduction in ceramic materials. SrZr0.8Y0.2O3-δ exhibits a high ionic conductivity of approximately 0.01 S cm-1 at 90 °C in both water and wet air, which has been demonstrated by direct ammonia fuel cells. Neutron diffraction confirms the presence of OD bonds in the lattice of deuterated SrZr0.8Y0.2O3-δ. The OH- ionic conduction of CaZr0.8Y0.2O3-δ in water was demonstrated by electrolysis of both H218O and D2O. The ionic conductivity of CaZr0.8Y0.2O3-δ in 6 M KOH solution is around 0.1 S cm-1 at 90 °C, 100 times higher than that in pure water, indicating increased OH- ionic conductivity with a higher concentration of feed OH- ions. Density functional theory calculations suggest the diffusion of OH- ions relies on oxygen vacancies and temporarily formed hydrogen bonds. This opens a window to discovering new ceramic ionic conducting materials for near ambient temperature fuel cells, electrolysers and other electrochemical devices.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Imprimir
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido