Abstract
Photocatalytic H2O2 evolution has received extensive attention as an environmentally friendly method, which is a dynamic process of formation and decomposition. At present, researches mainly focus on the H2O2 formation, while the decomposition of H2O2 is rarely studied. In addition, platinum as a cocatalyst plays an important role in enhancing the photocatalytic activity, but the effects of platinum valence state on the activity, especially towards H2O2 formation and decomposition, has not been studied in detail to the best of our knowledge. In this work, platinum with different valence state were deposited onto boron containing metal organic frameworks (UiO-67-B), and the roles of Pt(0), Pt(II) and Pt(IV) in the photocatalytic H2O2 process were explored in detail. Both the experimental results and theoretical calculations indicate that the presence of Pt(II) plays an important role not only in promoting the H2O2 formation but also in inhibiting the H2O2 decomposition.
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