2019/04/12 by Shunhang Wei, Shu Jin, Guoxiang Pan +3
Chemistry · Energy · Engineering · #Absorption (acoustics) #Advanced Photocatalysis Techniques #Band gap #Catalysis #Chemistry #Crystal structure #Crystallography #Inorganic Chemistry and Materials #Inorganic chemistry #Materials science #Organic chemistry #Oxygen #Perovskite (structure) #Perovskite Materials and Applications #Photocatalysis #Photochemistry #Redox #Visible spectrum
paper · doi:10.1111/jace.16485
openalex publication_date 2019/04/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract Although BaNbO 2 N has visible light absorption as far as 740 nm, its photocatalytic activity is generally very poor under ordinary conditions, being incommensurate to its light absorption properties. In this work, we introduce Ca into the B site of BaNbO 2 N to form a complex perovskite BaNb 1− x /3 Ca x /3 O 2+ y N 1− y (0 ≤ x , y ≤ 1). The presence of Ca in BaNbO 2 N has great impact on a number of important properties such as band gap value, nitrogen content, surface hydrophilicity, and defects levels. In particular, defects such as Nb 4+ species are effectively suppressed in Ca‐modified BaNbO 2 N. More importantly, photocatalytic activity of BaNbO 2 N for water oxidation reactions is substantially improved after Ca modifications. Compared with pristine BaNbO 2 N, more than twofold enhancement in photocatalytic oxygen evolution is observed for BaNb 0.8 Ca 0.2 O 2+ y N 1− y ( x = 0.6). Such improvements probably stem from the suppression of Nb 4+ species in the structure as well as enhanced surface hydrophilicity after Ca modification. The facile approach by incorporating alkaline earth cations into crystal structure can be well extended to other perovskite oxynitrides whose photocatalytic activity is subject to those defective species.