Abstract
The (Fe0.5Co0.5)70B21Ta4Ti5 amorphous high-entropy alloy (HEA) ribbon without surface pretreatment shows the excellent photocatalytic efficiency and recycling stability in the degradation of Eosin Y. Even after 20 cycles, the amorphous HEA ribbon is still mainly in the amorphous state and remains flexible. Its degradation effect is compared with Fe-Si-B amorphous ribbon, Fe0 powder and TiO2 powder, showing superior catalytic performance.The alternating evolution of Ti(Ta)-rich passive film and Fe(Co)-rich fresh layer effectively promotes and appropriately inhibits the reaction to ensure the high efficiency and continuity of catalysis. The underlying mechanisms of salient photocatalytic activity are proposed by the introductions of nano-twins and stacking faults, multiple superimposed heterogeneous interfaces, and mutual conversion of Fe/Co with various valence.
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