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Investigates how electric fields and doping affect catalytic CO oxidation in nanoscale ceria and its variants, highlighting implications for catalysis.
Herein, we investigate how aliovalent doping and application of an external electrical field modulates the catalytic activity of nanoscale ceria ( n CeO 2 ) towards CO oxidation. Gd 3+ and La 3+ were doped into the n CeO 2 lattice. Such doping influences the concentration and mobility of oxygen vacancies, which are promoting CO oxidation to CO 2 . When applying an electric potential, charge transport within n CeO 2 is modulated. Our results show that both dopants Gd 3+ and La 3+ lead to an increasing V O concentration, whereas the impact of the applied potential on the oxidation behaviour varies with catalyst composition. The applied electric potential markedly improves the activity of undoped n CeO 2 and 5% Gd 3+ -doped n CeO 2 ; however, it causes no significant change in CO oxidation capability in 2.5% Gd 3+ -doped and La 3+ -doped samples. These findings can be understood considering the applied potential and its influence on the polaron mobility and V O arrangement, which are controlled by the underlying oxidic defect structure.
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Jamshidi et al. (2026) studied this question.
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