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Showing 1–9 of 9 results
Advanced filters: Author: Sossina M. Haile Clear advanced filters

  • Although high proton conductivity and chemical stability in yttrium-doped barium zirconate are of interest for intermediate-temperature solid-oxide fuel cells, there are remaining issues regarding its defect chemistry and macroscopic proton-transport mechanism. Proton transport in this compound is shown to be limited by proton–dopant association, and the presence of two types of proton environment above room temperature are observed, reflecting differences in proton–dopant configurations.

    • Yoshihiro Yamazaki
    • Frédéric Blanc
    • Sossina M. Haile
    Research
    Nature Materials
    Volume: 12, P: 647-651

  • Enhancing the oxygen exchange rate at the surface of oxides through rational design has long been a key goal of researchers pursuing sustainable energy solutions. Now, a simple infiltration method reveals that reaction rates on porous mixed-conducting oxides scale with the acidity of the infiltrate and can be tuned by orders of magnitude.

    • Sossina M. Haile
    News & Views
    Nature Catalysis
    Volume: 3, P: 863-864

  • Protonic ceramic fuel cells use oxide electrolytes with high protonic conductivity but suffer from low power densities due to sluggish oxygen reduction kinetics and high contact resistances. Here the authors integrate a PrBa0.5Sr0.5Co1.5Fe0.5O5+δ cathode and a BaZr0.4Ce0.4Y0.1Yb0.1O3 electrolyte, achieving exceptional power density and stability.

    • Sihyuk Choi
    • Chris J. Kucharczyk
    • Sossina M. Haile
    Research
    Nature Energy
    Volume: 3, P: 202-210

  • A key step in fuel-cell energy-conversion processes is electro-oxidation of the fuel at the anode, but ways to improve electrocatalytic activity remain unclear. Using ceria–metal structures, H2-oxidation reactions are shown to be dominated by electrocatalysis at the oxide/gas interface with minimal contributions from the oxide/metal/gas triple-phase boundaries.

    • William C. Chueh
    • Yong Hao
    • Sossina M. Haile
    Research
    Nature Materials
    Volume: 11, P: 155-161

  • Mixed ionic–electronic conductors are limited by material decomposition. Here the authors reveal the mechanism for atom migration and deposition in Cu2–δ(S,Se) materials based on a critical chemical potential difference and propose electronically conducting, ion-blocking interfaces to enhance stability.

    • Pengfei Qiu
    • Matthias T. Agne
    • G. Jeffrey Snyder
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-8