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3810592

Revealing the activation mechanism of "green molecule" H2O2

Date
March 26, 2023

Hydrogen peroxide (H2O2) molecules play important roles in many green chemical reactions. However, the high activation energy limits their application efficiency, and there is still huge controversy about the activation path of H2O2 molecules over the presence of *OOH intermediates. Here, we confirmed the formation of the key species *OOH in the heterogeneous system, via in situ shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS), isotope labeling, and theoretical calculation. In addition, we found that compared with *H2O2, *OOH was more conducive to the charge transfer behavior with the catalyst and the activation of an O-O bond. Furthermore, we proposed to improve the local coordination structure and electronic density of the YFeO3 catalyst by regulating the surface relaxation with Ti modification so as to reduce the activation barrier of H2O2 and to improve the production efficiency of ●OH. As a result, the kinetics rates of the Fenton-like (photo-Fenton) reaction had been significantly increased several times. The ●OH free radical activity mechanism and molecular transformation pathways of 4-chloro phenol (4-CP) were also revealed. This may provide a clearer vision for the further study of H2O2 activation and suggest a means of designing catalysts for efficient H2O2 activation.
<b>Figure 1. SHINERS spectra, Raman vibration simulation and possible reaction mechanism.</b>

Figure 1. SHINERS spectra, Raman vibration simulation and possible reaction mechanism.

<b>Figure 2. Catalyst design idea</b>: Ti doping modifies the catalyst, causing local charges and local structure to change, making the charge distribution of *OOH species more favorable and the O-O bond of *OOH on its surface easier to break and to form ●OH.

Figure 2. Catalyst design idea: Ti doping modifies the catalyst, causing local charges and local structure to change, making the charge distribution of *OOH species more favorable and the O-O bond of *OOH on its surface easier to break and to form ●OH.

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Hydrogen peroxide (H2O2) molecules play important roles in many green chemical reactions. However, the high activation energy limits their application efficiency, and there is still huge controversy about the activation path of H2O2 molecules over the presence of *OOH intermediates…