Transition metals in Ni/GDC for the reversible solid oxide cell operation : optimization of the Mo-Au-Ni synergy and further enhancement via substitution of Mo with Fe - Ζαραβέλης, Φώτιος; Σύγκελλου, Λαμπρινή; Σουβαλιώτη, Αθηνά; Νιάκολας, Δημήτριος (Electrochimica Acta, 2023)