Photocatalytic H₂O₂ Production from Ethanol/O₂ System Using TiO₂ Loaded with Au–Ag Bimetallic Alloy Nanoparticles

Abstract

TiO2 loaded with Au–Ag bimetallic alloy particles efficiently produces H2O2 from an O2-saturated ethanol/water mixture under UV irradiation. This is achieved via the double effects created by the alloy particles. One is the efficient photocatalytic reduction of O2 on the Au atoms promoting enhanced H2O2 formation, due to the efficient separation of photoformed electron–hole pairs at the alloy/TiO2 heterojunction. Second is the suppressed photocatalytic decomposition of formed H2O2 due to the decreased adsorption of H2O2 onto the Au atoms.

Enhancing Light-Driven Production of Hydrogen Peroxide by Anchoring Au onto C3N4 Catalysts

“…This was potentially ascribed to the smaller size of Au nanoparticles in the Au/C 3 N 4 -500(N 2 ) (Figure 1). Similar findings were also observed in the Au-and AuAg-loaded TiO 2 photocatalytsts [14,16]. The apparent quantum yield (Φ AQY ) for H 2 O 2 formation over the Au/C 3 N 4 -500(N 2 ) was calculated using the equation…”

“…In such a process, a highly efficient photocatalyst could be a core factor in order to direct the synthesis of H 2 O 2 . Titanium dioxide (TiO 2 ), a widely studied photocatalyst, has been found to enable the formation of H 2 O 2 [12][13][14][15][16]. Several strategies have been developed to enhance the H 2 O 2 yield on TiO 2 -based photocatalysts.…”

“…For example, the surface modification of TiO 2 by fluorine ions was proposed [13]. The loading of noble metal (Au) and alloys (AuAg) on TiO 2 were studied [14,16]. However, the robust hole oxidative capability of TiO 2 accelerated the decomposition of H 2 O 2 on the surface of TiO 2 , and thus lowered the H 2 O 2 yield [17].…”

Understanding the synergistic effects of gold bimetallic catalysts

“…The synthesis of supported Au-Ag and Au-Cu bimetallic catalysts usually involves two kinds of protocols: (a) preformation of bimetallic nanoparticles in solution followed by deposition on a certain support [57], and (b) deposition of two metal precursors on a support followed by co-reduction or sequential reduction [21,58]. In the first protocol, both the chemical composition and the particle size, and even the particle shape, can be controlled well by taking full advantage of solution-based synthesis of colloidal metals [53].…”

Titanium Oxide-based Photocatalysts for Selective Organic Transformations

“…Bimetallic alloy particles loaded on TiO2 are effective for other photocatalytic reaction. Recently, we found that P25 TiO2 loaded with Au _ Ag bimetallic alloy particles efficiently catalyzes the formation of hydrogen peroxide under UV irradiation in alcohol solution with O2 41) . …”