Abstract
Though TiO2 was famous for good chemical stability, as an ultrathin flaky structure, TiO2 nanosheet also got mired in photo-corrosion. Herein, we explored the inner mechanism of photo-corrosion phenomenon among nanosheet structure, and demonstrated the vital role of high specific surface area and perfect dispersity of nanosheet photo-catalyst in H2 evolution reaction, rather than the heterophase junction of TiO2(B)/λ-Ti3O5. Through exploring four different Conditions, we have confirmed the important modification of highly active metal co-catalyst and surfactant PVP for greatly promoted catalytic efficiency and excellent morphology, efficiency stability. In especial, sole addition of PVP not only stabilized the nanosheet morphology, also tripled the original TiO2(B) efficiency, while TiO2-Au-4h(PVP) displayed the highest QE of 30.9 %, and best stability. This work developed an excellent stable TiO2(B) nanosheet based catalyst, also established a possible strategy to settle photocorrosion for other nanosheet mateials under illuminated applications.
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