Potential Application of Perovskite Structure for Water Treatment: Effects of Band Gap, Band Edges, and Lifetime of Charge Carrier for Photocatalysis

Abstract

Perovskite structures have attracted scientific interest as a promising alternative for water treatment due to their unique structural, high oxidation activity, electronic stability, and optical properties. In addition, the photocatalytic activity of perovskite structures is higher than that of many transition metal compounds. A critical property that determines the high-performance photocatalytic and optical properties is the band gap, lifetime of carrier charge, and band edges relative to the redox potential. Thus, the synthesis/processing and study of the effect on the band gap, lifetime of carrier charge, and band edges relative to the redox potential in the development of high-performance photocatalysts for water treatment are critical. This review presents the basic physical principles of optical band gaps, their band gap tunability, potentials, and limitations in the applications for the water treatment. Furthermore, it reports recent advances in the synthesis process and comparatively examines the band gap effect in the photocatalytic response. In addition to the synthesis, the physical mechanisms associated with the change in the band gap have been discussed. Finally, the conclusions of this review, along with the current challenges of perovskites for photocatalysis, are presented.

To investigate the structural, electronic, optical and magnetic properties of Sr-doped KNbO3 for perovskite solar cell applications: A DFT study

“…This is significant for optical properties such as optical sensor encoding, stereoscopic storage devices, process conjunctions [12], wireless communication, piezoelectric nanomaterial, and inert ferroelectric processing [13]. A theoretical investigation is required to put together the characteristics (structural, optical, and electrical) of (KNbO 3 ), and first-principles calculations are the most useful instrument for this [14][15][16][17][18][19]. In the case of first principle calculations, however, there are just a few computations for (KNbO 3 ) [20,21].…”

Current Status and Future of Organic–Inorganic Hybrid Perovskites for Photoelectrocatalysis Devices

“…As reported in the recent literature, two different strategies have been followed to create a hybrid inorganic–organic perovskite: (1) where the organic motif is decorated within or on the surface of the crystal of perovskite material to impact the photoactivity and stability in water and (2) by hybridization of the relevant perovskite and a suitable conducting polymer or macromolecule to create a heterojunction. − …”