Doping effects on proton incorporation and conduction in SrZrO3

Journal of Computational Chemistry
Chunsheng Shi, Masahiko Morinaga

Abstract

The doping effects on the proton incorporation and protonic conductivity of perovskite-type SrZrO3 were investigated using the density functional theory (DFT) with the generalized gradient approximation (GGA). The optimized geometries, formation energies of hydrogen defect and activation energies for hydrogen diffusion in SrZrO3 doped with Al, Sc, Ga, Y, Rh, In, and Yb were calculated. It was shown that the doping leads to large local distortions around hydrogen and dopant ion, affecting the protonic conduction in these oxides. The alignment of hydrogen levels varies with the dopant introduced into the SrZrO3. In In-, Y-, Sc-, Ga-, and Al-doped SrZrO3, the H+ is the lowest energy state in all the bandgap. But for Yb- and Rh-doped SrZrO3, the H+ is the lowest energy state only when the Fermi energy below 2.37 and 2.66 eV, respectively. The estimates of the activation energy show good agreement between the measured and calculated activation energies. Also, the hydrogen diffusion seems to become more difficult as the distance between hydrogen and dopant ion decreases.

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Citations

Aug 17, 2010·The Journal of Chemical Physics·Maria A GomezKatharyn M Fletcher
Jul 17, 2014·The Journal of Chemical Physics·Sung Gu Kang, David S Sholl
Apr 21, 2017·Physical Chemistry Chemical Physics : PCCP·Leigh WestonC G Van de Walle
Jul 1, 2016·Journal of Materials Chemistry. A, Materials for Energy and Sustainability·Francis G KinyanjuiSten G Eriksson
Dec 12, 2013·Evidence-based Complementary and Alternative Medicine : ECAM·Juanjuan ZhengXueyong Shen
Oct 22, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Stefan T NorbergSten G Eriksson

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