Aluminum-doped strontium titanate SrTiO 3 (Al), has been demonstrated as the suitable photocatalyst for overall water splitting. Noble metals, such as RhCrO x , are widely applied to accelerate the photocatalytic hydrogen evolution . Herein, Ni single atoms anchored on nitrogen-doped graphene (Ni SA-NG) are adopted to replace noble metal as hydrogen (H 2 ) evolution cocatalysts for SrTiO 3 (Al)/CoO x photocatalyst. The prepared Ni SA-NG/SrTiO 3 (Al)/CoO x photocatalyst exhibits remarkable activity for photocatalytic overall water splitting with the H 2 evolution rate of 498 μmol g −1 h −1 and oxygen (O 2 ) evolution rate of 230 μmol g −1 h −1 , respectively. Ni SA-NG not only improves the efficiency of photogenerated charge transfer and separation through the Ti–O–C bonds acting as the electron transfer freeway, but also provides highly active sites to accelerate the surface H 2 evolution rate. This research provides a valuable method to construct SrTiO 3 -based photocatalyst without noble metal cocatalysts.
Aluminium doped strontium titanate, SrTiO3(Al), is considered as the most promising candidate photocatalyst for water splitting; however, it suffers from fast recombination of photogenerated charges and little photocatalytic activity for overall water splitting. Precious metals, such as RhCrOx, are always needed as cocatalysts to enhance the photocatalytic performance. Herein, nitrogen doped graphene quantum dots (NGQDs) were prepared and applied as a hydrogen evolution reaction (HER) cocatalyst of SrTiO3(Al)/CoOx for photocatalytic overall water splitting. The designed NGQDs/SrTiO3(Al)/CoOx is highly active for overall water splitting achieving a H2 evolution rate of 18.8 μmol h−1 and an O2 evolution rate of 9.0 μmol h−1, respectively. The NGQDs and CoOx are dispersed on the different crystal facets of octagonal SrTiO3(Al), which is beneficial to the spatial separation of photogenerated electrons and holes. The strong interaction between NGQDs and SrTiO3(Al) via Ti–O–C chemical bonds enhances the charge transfer and separation. Moreover, the pyrrole N species within NGQD networks act as active sites for the hydrogen evolution reaction.
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