Electronic structure basis for enhanced overall water splitting photocatalysis with aluminum doped SrTiO₃ in natural sunlight

Abstract

Aliovalently Al3+ doped strontium titanate enables overall water splitting in type 1 baggie particle suspension reactors in direct sunlight.

Effect of Na‐Doping on Electron Decay Kinetics in SrTiO3 Photocatalyst

“…It is well known that substitution of cations by lower valence cations increases oxygen vacancies to keep the charge neutrality . In the case of Na‐doping into SrTiO 3 , Sr 2+ can be substituted by Na + , resulting in increasing the number of oxygen vacancies.…”

Perovskite Oxynitride Solid Solutions of LaTaON2‐CaTaO2N with Greatly Enhanced Photogenerated Charge Separation for Solar‐Driven Overall Water Splitting

“…All other constituent elements such as O, La, and Ca have reasonable XPS bonding states (Figure S9, Supporting Information) and are consistent with literatures. [ 5,39,40 ]…”

Ferroelectric surface photovoltage enhancement in chromium-doped SrTiO3 nanocrystal photocatalysts for hydrogen evolution

“…Tentatively, we attribute it to acceptor states 1.75 eV above the SrTiO 3 valence band that are caused by oxygen vacancy complexes {Ti 4+ , V O } in the material. 10 As can be seen from Fig. 4a, the photovoltage reaches approximately À3.7 V at 2.7 eV and increases only mildly upon excitation of the SrTiO 3 host at 3.2 eV.…”

“…[1][2][3][4] SrTiO 3 is appealing due to its high chemical stability and band edges that are appropriately positioned for proton reduction and water oxidation. [5][6][7][8][9][10] However, the wide band gap of SrTiO 3 (3.2 eV) restricts the absorption of photons to less than 5% of the solar spectrum (UV light only). Doping of SrTiO 3 with metal ions (M = Rh, Ru, Cr) adds new states inside the band gap, allowing photochemical H 2 evolution under visible light.…”