Boosted photoconversion of SF6 over defective ZnGa2O4 nanosheets under mild conditions

Abstract

In the context of sulfur hexafluoride (SF₆) photoreduction, the impact of defects has been shown to produce contradictory results. To address this, we have chosen to utilize two-dimensional materials as ideal models for our investigation. Owing to their high specific surface area and high atomic exposure ratio, we can comprehensively assess how defects affect the three processes involved in SF₆ photoreduction. We have successfully fabricated oxygen-deficient ZnGa₂O₄ nanosheets and confirmed their existence through electron spin resonance and X-ray photoelectron spectroscopy spectra. By examining UV-vis diffuse reflectance spectra, photoluminescence spectra, time-resolved fluorescence emission decay spectra, and BET surface area, we have observed that the oxygen defects aid in expanding the capabilities of photoabsorption and facilitating carrier separation. Consequently, the oxygen-deficient ZnGa₂O₄ nanosheets demonstrate an enhanced SF₆ photoconversion performance compared to the ZnGa₂O₄ nanosheets. In short, this research highlights the significance of introducing defects into photocatalysts to optimize crucial photocatalytic steps, resulting in improved SF₆ photoreduction performance.