Mechanism analysis of Au, Ru noble metal clusters modified on TiO₂ (101) to intensify overall photocatalytic water splitting

Abstract

Enhancement mechanism of the hydrogen evolution reaction (HER) attributed to the synergistic effect of electron-traps and surface plasmon resonance (SPR).

FacileSynthesis of Anatase TiO2Nanocrystals with Co‐Exposed{101}, {010}/{100} and [111]‐Facets for EfficientPhotodegradation of Methylene Blue

“…The steady‐state fluorescence of TiO 2 samples depicts several intense emission peaks at about 398, 437, 449, 468, 481, 492 and 555 nm. The first emission peak at about 398 nm can be attributed to the emission of the band‐band PL process of the anatase, while all of the other emission peaks can be attributed to the robust recombination of charge carriers occupying the surface of TiO 2 [33,34] . For the prepared and the commercial TiO 2 samples, the PL intensity increases in an order of 0.5HF‐TiO 2 <2.0HF‐TiO 2 <1.0HF‐TiO 2 <2.5HF‐TiO 2 <3.0HF‐TiO 2 <Bodi‐TiO 2 <1.5HF‐TiO 2 .…”

“…The first emission peak at about 398 nm can be attributed to the emission of the band-band PL process of the anatase, while all of the other emission peaks can be attributed to the robust recombination of charge carriers occupying the surface of TiO 2 . [33,34] For the prepared and the commercial TiO 2 samples, the PL intensity increases in an order of 0.5HF-TiO 2 < 2.0HF-TiO 2 < 1.0HF-TiO 2 < 2.5HF-TiO 2 < 3.0HF-TiO 2 < Bodi-TiO 2 < 1.5HF-TiO 2 . The lowest PL intensity for 0.5HF-TiO 2 indicates that the synergistic effect of the coexistence of {101}/{100}, {010}, [111]-facets and the maximum specific surfaces is beneficial to depress the recombination rate of photogenerated electrons and photogenerated holes, which generally favors long lifetime of the charge carriers and high photocatalytic activity.…”

Theoretical calculation of a TiO2-based photocatalyst in the field of water splitting: A review

“…These impurity energy levels have been used as shallow acceptor levels or shallow donor levels and then become effective traps for photogenerated electrons. As shown in Figure 3(a), Yang et al [111] used theoretical calculations based on DFT to study the photodeposition of Au or Ru precious metal clusters with excellent electronic properties as cocatalysts on the anatase phase TiO 2 (101) surface and the mechanism of enhanced photocatalytic activity. As a result, the synthesized Ru/TiO 2 and Au/TiO 2 both showed excellent HER activity (Figure 3(b)).…”

The mechanism of Co oxyhydroxide nano-islands deposited on a Pt surface to promote the oxygen reduction reaction at the cathode of fuel cells

“…The high-resolution XPS prole of Co shows two broad sets of signals corresponding to 2p 3/2 (781.35 eV) and 2p 1/2 (797.25 eV) excluding the presence of metallic cobalt (778.0 eV) at the surface of the Pt-OCoOH. 44 The signal at 781.25 eV is a satellite peak of Co oxides and hydroxides. More evidence must be collected by analyzing the gap between 2p 1/2 and 2p 3/2 peaks and the structure of the satellite bands.…”