This work compares the capacity of generating
the surface oxygen vacancies over SrTiO<sub>3</sub>, BaTiO<sub>3</sub> and the
mixed Sr<sub>0.5</sub>Ba<sub>0.5</sub>TiO<sub>3</sub>. This aspect is elucidated
by significantly different chemical states of the elements on the surface of
the three materials. Along with the fundamental materials aspect, CO oxidation
studies complement the highest surface reducibility of the Sr<sub>0.5</sub>Ba<sub>0.5</sub>TiO<sub>3</sub>
catalyst. With detailed adsorption-desorption studies, we report that the A-site
cation substitution renders a better surface-reducibility induced catalytic
activity for CO oxidation.
Low temperature CO oxidation catalysed by flower-like Ni–Co–O: how physicochemical properties influence catalytic performance