Revealing the contribution of singlet oxygen in the photoelectrochemical oxidation of benzyl alcohol

Abstract

Analysis of photoelectrochemical oxidation of benzyl alcohol reveals a non-electrochemical UV-light process, with a huge impact on the reaction performance.

Switchable All Inorganic Halide Perovskite Nanocrystalline Photoelectrodes for Solar‐Driven Organic Transformations

“…[22b,28] From these energy diagrams, it is clear that both BzOH oxidation and BzCHO reduction are A 400 nm high pass neutral filter was used to suppress photoexcitation of TiO 2 and NiO selective contacts or a plausible formation of singlet oxygen under UV light, which could react with the organic species. [26] thermodynamically favorable with photogenerated carriers at CsPbBr 3 NCs in the developed heterostructured electrodes, consistently with the voltammograms showed in Figure 2. Indeed, higher thermodynamic driving force exists for the photoelectroreduction of BzCHO, compared to the photoelectro-oxidation of BzOH, which may account for the enhanced photocurrents reported here for this reduction reaction.…”

“…A 400 nm high pass neutral filter was used to suppress photoexcitation of TiO 2 and NiO selective contacts or a plausible formation of singlet oxygen under UV light, which could react with the organic species. [ 26 ]…”

“…[ 25 ] For example, a recent study with metal oxide photoanodes (BiVO 4 ) operating at higher current densities, was conducted for more than 12 h for a quantitative assessment. [ 26 ] It is also plausible that once the CsPbBr 3 NCs detach from the electrode, they continue working as photocatalysts, with the reduction of BzCHO to BzOH being thermodynamically favorable compared to the oxidation of BzOH. This is supported by the relative positions of the valence and conduction bands with the redox position of the BzCHO/BzOH couple (see Figure 4 and further discussion in the Supporting Information).…”

“…Figure 2. a) Optical absorbance of the FTO/TiO 2 and FTO/NiO photoanodes with and without CsPbBr 3 NCs, b) cyclic voltammetry curves in the dark and under illumination showing the photocurrents of FTO/TiO 2 /CsPbBr 3 NCs photoanodes with and without BzOH substrate in 0.1 M Bu 4 NPF 6 in dichloromethane electrolyte, c) cyclic voltammetry curves in the dark and under illumination showing the photocurrents of FTO/NiO/CsPbBr 3 NCs photocathodes with and without BzCHO substrate in 0.1 M Bu 4 NPF 6 in dichloromethane electrolyte, d) operation condition of the tandem arrangement of a photoanode and a photocathode for a photo-assisted BzOH/BzCHO fuel cell.A 400 nm high pass neutral filter was used to suppress photoexcitation of TiO 2 and NiO selective contacts or a plausible formation of singlet oxygen under UV light, which could react with the organic species [26]. …”

Photocatalysis Goes Thinner Than a Hair: Carbon Nitride Thin Films as All-in-one Technology for Photocatalysis

“…Once formed, 1 O2 reacts with benzyl alcohol producing benzaldehyde and presumably H2O2. 54 Then, benzaldehyde is converted to benzoic acid either via thermal or photocatalytic pathway (Figure 5b). Hence, the developed technology not only makes the Vis-BWR a convenient choice to conduct a photocatalytic reaction, it is also more efficient compared to the analogous dispersion of photocatalyst in liquid medium.…”