Photoelectrocatalytic Properties of a Ti-Modified Nanocrystalline Hematite Film Photoanode

Photoelectrocatalytic oxidation of methanol, ethylene glycol, glycerol, and 5,6,7,8-tetrahydro-2-naphthol on thin-film nanocrystalline hematite electrodes fabricated by electrochemical deposition and promoted with spin-coated titanium has been studied. It is shown that the modification of hematite transforms it into material exhibiting high activity in the photoelectrochemical process of substrate oxidation upon illumination with light in the visible region of the spectrum. The highest activity is observed in the reaction of photoelectrocatalytic oxidation of glycerol. Results of intensity-modulated photocurrent spectroscopy (IMPS) suggest that the effect is due to an increased rate of charge transfer in the process of photoelectro-oxidation and efficient suppression of the recombination of generated electron-hole pairs. Therefore, thin-film photoanodes based on modified hematite are promising for practical application in the photooxidation of glycerol, a by-product of biofuel production, as well as in the photoelectrochemical degradation of other organic pollutants, including those formed during the production of pharmaceuticals.

Automated summary

The study demonstrates that modification of hematite electrodes can enhance their activity in photoelectrocatalytic oxidation reactions, especially in the oxidation of glycerol. Results from intensity-modulated photocurrent spectroscopy suggest that the increased activity is due to the higher rate of charge transfer and efficient suppression of electron-hole pair recombination in the oxidation process.