While we use TiO2 as the catalyst to do some chemical reaction, we could use themo or photo as the engergy input. In fact, conventional thermal catalysis process was normally explained by the acid or base site of TiO2 based catalyst while also the temperature could induce the internal electron-charge seperations of semiconductors. How to think about why one catalyst (semicondutor) could use two theory to explain its role during the catalysis process? How to clasify?
Heat causes to release the electrons in a conductor becuase of very low bandgap but in a semiconductor such as TiO2 we nead higher amount of Q and it can change littice structure of TiO2 from anatase form to inactive rutile phase.
Hi,
The semiconductor can be photocatalyst, when the bandgap ranges 1-5 eV.
The mechanical properties can be study the effect of force....
The thermal properties can be study for semiconductor with calcination then study XRD, AFM, SEM .....
Mohammad Reza Toosi Yes, could we oberseve or show the evidence of the electron loss from semiconductors during themo catalysis process. Are the movement of electrons induced by thermo energy could also lead to one side is reductive, another side is oxidative just like photocatalysis or the source of electron is different because of the induced energy types?
" we could use themo or photo as the engergy input? (two misspellings!) Thermal energy is approximately 0.025 eV at room temperature. The energy of a single 400 nm photon is 3.1 eV.
Xinxing wu , As Dr. Yurii V Geletii mentioned, thermal energy is in the range of IR spectra while the photons required to excite electrons from VB to CB band are in UV range.
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