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Rapid fabrication of oxygen-deficient zirconia by flash sintering treatment
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DOI：10.26599/JAC.2024.9220976.png)
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Abstract
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The introduction of oxygen vacancies into zirconia is an effective strategy for enhancing its light absorption ability and photocatalytic performance. However, the cost-efficient preparation of oxygen-deficient zirconia (ZrO2-x) remains challenging, which severely limits its broad application. In this study, flash sintering treatment was used to fabricate ZrO2-x bulk in very short time of 90 s. Oxygen vacancies were introduced into ZrO2 bulk through electrochemical reduction reactions. The as-prepared black ZrO2-x exhibited excellent optical absorption capability, a small band gap (2.09 eV for direct and 1.67 eV for indirect), and a reduced conduction band energy, which is ascribed to the generation of oxygen vacancies and reduction of Zr cations. The as-prepared ZrO2-x showed remarkable photocatalytic activity due to excellent solar light absorption and low recombination rate of electron-hole pairs. Flash sintering treatment provides a cost-efficient approach for rapidly fabricating ZrO2-x bulk materials with high concentrations of oxygen vacancies, which can also be applied to other materials.
Keywords:
zirconia
oxygen vacancy
flash sintering treatment
electrochemical reduction
optical absorption
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