Highly donor-doped (110) layered perovskite materials as novel photocatalysts for overall water splitting

Abstract

Highly donor-doped (110) layered perovskite materials with a generic composition of A m B m O 3m + 2 (m = 4, 5; A = Ca, Sr, La; B = Nb, Ti) loaded with nickel have been found to be efficient photocatalysts for overall water splitting with quantum yields as high as 23% under UV irradiation.

Overall Water Splitting on Tungsten-Based Photocatalysts with Defect Pyrochlore Structure

“…With the exception of a few Nb-based photocatalysts [5][6][7] and some mixed oxides based on Zn(II), Ga(III), In(III), Ge(IV), and Sb(V) with d(10) configuration [9], most of the materials that are able to drive overall water splitting contain Ta or titanium (Ti) as chief components. Hence, this finding may give an alternative approach for designing new photocatalytic materials.…”

“…Due to the difficulty in meeting all of these requirements using conventional materials, new materials have been synthesized and examined for the purpose of photocatalytic water splitting. Some photocatalysts with wide band gaps have been found to be active for water splitting into H 2 and O 2 in stoichiometric amounts under ultraviolet (UV)-light irradiation [3][4][5][6][7][8][9][10][11][12][13]. Although the final goal of photocatalytic overall splitting is utilization of sunlight, i.e., having a visiblelight response, with high efficiency, materials that work even under UV irradiation are still limited and photon energy conversion is far from the stage of practical use at present.…”

Hydrothermal synthesis of flaky crystallized La2Ti2O7 for producing hydrogen from photocatalytic water splitting

“…A highly donor-doped (110) layered La 2 Ti 2 O 7 has also been found to be an efficient photocatalyst for the degradation of organic pollutants, which is comparable to TiO 2 (P25) [2]. Moreover, this photocatalysts loaded with nickel show high quantum yields for the water photosplitting [3,[13][14][15]. However, the surface areas of these materials are still very small due to the high-temperature treatment needed to obtain crystalline phases.…”

Nanocatalysts for Water Splitting

“…Highly donor-doped Ca 2 Nb 2 O 7 with layered perovskite structure has a band gap of 4.3 eV. 77 Under UV irradiation, Ca 2 Nb 2 O 7 loaded with NiO cocatalysts can produce H 2 from pure water with a quantum yield of 7% at 290 nm. Similarly, the Sr 2 Nb 2 O 7 with isostructure can produce H 2 from pure water splitting with a quantum yield of 23% at 300 nm.…”