Perovskite and layered perovskite oxynitrides for efficient sunlight-driven artificial synthesis

Abstract

Perovskite and layered perovskite oxynitrides are regarded as promising visible-light-responsive semiconductors for efficient artificial photosynthesis to produce renewable value-added energy resources, including H2, formic acid (HCOOH), and ammonia (NH3). This...

Enhanced neutral seawater splitting on less-defective, two-dimensional LaTiO2N photoanodes prepared from layered perovskite BaLa4Ti4O15

“…Moreover, the smooth surfaces of the oxides became porous, which originated from the exchange of three O 2− with two N 3− ions during nitridation. 12 The porosity of LaTiO 2 N prepared from BaLa 4 Ti 4 O 15 was much higher than that prepared from La 4 Ti 3 O 12 , even though both the particles were relatively large (Fig. S9†).…”

“…6,9,10 Their band structures span various electrochemical redox potentials feasible for artificial photosynthesis, producing value-added energy sources such as H 2 , formic acid, and ammonia. 11,12 Perovskite-type LaTiO 2 N has a bandgap energy ( E g ) of 2.1 eV ( λ < 600 nm), harvesting approximately half of the visible-light spectrum. The narrow E g of the oxynitride typically originates from the negative shift of its valence band maximum potential by the hybridization of N 2p and O 2p atomic orbitals during the nitridation of the starting oxide.…”