Design, synthesis and photocatalytic performance of A32Ti8Sn8Nb4Ta4Me8O96 (A=Ba, Sr; Me=Fe, Ga) perovskite structure high entropy oxides

High entropy oxides (HEOs) are characterized by a single-phase in which multiple cations are responsible for elevating the endothermicity and stability of the system. However, it is still difficult to predict the single-phase structure of high entropy oxides due to the complex composition. This paper considers the chemical-short range order and proposes a novel design method for a creative kind of A(32)Ti(8)Sn(8)Nb(4)Ta(4)Me(8)O(96) (A = Ba, Sr; Me = Fe, Ga) perovskite structure high entropy oxides (PHEOs) based on the cluster-plus-glue-atom model, and the photocatalytic performance of the synthesized samples was investigated. Results indicated that the PHEOs are successfully synthesized, and their compositions are not constrained by equimolar cations, hence expanding the composition into non-equimolar range. The as-prepared PHEOs exhibit good photodegradation ability of Cr (VI) contaminant. This article firstly proposes a new strategy for the design of PHEOs and gives a further exploration for the application of PHEOs in photocatalysts.