Enhanced Visible-Light-Sensitive Two-Step Overall Water-Splitting Based on Band Structure Controls of Titanium Dioxide and Strontium Titanate

Abstract

Visible light-induced two-step overall water-splitting was achieved by combining two types of photocatalysts, which were prepared by introducing foreign elements into rutile titanium dioxide (TiO 2 ) and strontium titanate (SrTiO 3 ) with a controlled electronic band structure. Rutile TiO 2 and SrTiO 3 were doped with chromium and tantalum (Cr,Ta-TiO 2 ) and with rhodium (Rh-SrTiO 3 ), respectively, to introduce visible-light sensitivity. Under irradiation with only visible light from a 420-nm LED lamp, the simultaneous liberation of hydrogen and oxygen with a molar ratio of ~2:1 was achieved with these two types of photocatalysts in the presence of iodate ion/iodide ion as a redox mediator.

Vertically Aligned Titanate Nanotubes Hydrothermally Synthesized from Anodized TiO2 Nanotube Arrays: An Efficient Adsorbent for the Repeatable Recovery of Sr Ions

“…Further, when the acid-washed sample was treated with Na, the peak reappeared around 1071 eV, as shown in Figure . The XPS peak of Sr ion-adsorbed sample contains doublet peaks, which correspond to the Sr 3d 5/2 and Sr 3d 3/2 …”

Effect of the Preparation Method of LaSrCoFeOx Perovskites on the Activity of N2O Decomposition

“…14% of the O 1s spectra. Notably, the oxide of Sr is found at a slightly lower binding energy than other elements, with a response seen at 527 eV [72,73]. The lack of lattice oxygen observed may be a result of the surface sensitive nature of XPS with an analysis depth of ca.…”

Three-Dimensional Carbonaceous Aerogels Embedded with Rh-SrTiO3 for Enhanced Hydrogen Evolution Triggered by Efficient Charge Transfer and Light Absorption

“…The comparison of Sr and Ti peaks of RST and the CNGRS2 aerogel is provided in Figure h. For RST nanoparticles, it can be seen that Sr 2+ 3d spectra exhibit two symmetric peaks at 132.77 eV (3d 5/2 ) and 134.54 eV (3d 3/2 ), whereas Ti 4+ 2p peaks are observed at 458.33 (2p 3/2 ) and 464.03 eV (2p 1/2 ). , In the CNGRS2 aerogel, a slight shift toward higher binding energy was observed when RST was coupled with GCN and GO. A similar shift in the O 1s spectra (Figure S3b,c) was also observed.…”

“…42 The C 1s spectra (Figure 4b 132.77 eV (3d 5/2 ) and 134.54 eV (3d 3/2 ), whereas Ti 4+ 2p peaks are observed at 458.33 (2p 3/2 ) and 464.03 eV (2p 1/2 ). 33,45 In the CNGRS2 aerogel, a slight shift toward higher binding energy was observed when RST was coupled with GCN and GO. A similar shift in the O 1s spectra (Figure S3b,c) was also observed.…”

“…Synthesis of GCN-RGO-RST (CNGRS) Aerogels. In this case, 10 mL suspension of GCN nanosheets (15 mg mL −1 ) was mixed with a 10 mL suspension of GO nanosheets (5 mg mL −1 ) along with the desired amount (15,30,45, and 60 mg) of RST nanoparticles and the mixture was treated under ultrasonication for 30 min. Here, the amphiphilic GO nanosheets can serve as a surfactant to disperse the GCN nanosheets and RST nanoparticles.…”