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. 2013 Aug 15;3:2426. doi: 10.1038/srep02426

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DFT calculations for elucidating the most probable elementary pathway for the ORR on the PBSCFO (a) Schematic illustration of PBSCFO with a pore channel labeled with a round box on the (010) plane. To illustrate the pore channel through the PrO plane and the CoO plane (perpendicular to the PrO plane), only the PrO and the CoO layers were shown. (b) A proposed mechanism for the surface ORR and the bulk diffusion via the pore channels in PrBa_0.5Sr_0.5Co_2−xFe_xO_5+δ (010). V_E is an oxygen vacancy in the GDC electrolyte.