Photoelectrochemical Properties of Crystalline Perovskite Lanthanum Titanium Oxynitride Films under Visible Light

Abstract

International audienc

Kinetic Assessment and Numerical Modeling of Photocatalytic Water Splitting toward Efficient Solar Hydrogen Production

“…It should be noted that only one hole in a LaTiO 2 N particle can shift E Fp significantly positively to a potential 0.36 V more negative than E V from eq 8. Since E V of LaTiO 2 N is 0.77 V more positive than the O 2 evolution potential, 39 E Fp of a LaTiO 2 N particle that contains one hole is more positive than the O 2 evolution potential by 0.41 V. On the other hand, E C of LaTiO 2 N is 0.1 V more negative than the hydrogen evolution potential. 39 Accordingly, LaTiO 2 N is thermodynamically expected to split water into H 2 and O 2 under weak excitation.…”

“…Since E V of LaTiO 2 N is 0.77 V more positive than the O 2 evolution potential, 39 E Fp of a LaTiO 2 N particle that contains one hole is more positive than the O 2 evolution potential by 0.41 V. On the other hand, E C of LaTiO 2 N is 0.1 V more negative than the hydrogen evolution potential. 39 Accordingly, LaTiO 2 N is thermodynamically expected to split water into H 2 and O 2 under weak excitation. However, overall water splitting on LaTiO 2 N has not yet been successfully demonstrated.…”

Determination and optimization of material parameters of particle-based LaTiO2N photoelectrodes

“…at the semiconductor-electrolyte interface, has shown the significant impact of surface lifetimes on 25 the photocurrent for a thin-film GaN photoanode, a well-defined material with known material 26 parameters 9 . It becomes obvious from these early modelling works that the knowledge of the 27 material parameters is key for model accuracy.…”

“…Further improvements up to a 23 photocurrent of 4.3mA/cm 2 (IPCE of 10%) were achieved by additionally reducing the doping 24 concentration and increasing the effective lifetime. 25 The numerical model developed in this work can be further used to study numerically the impact 26 of particle size on the photocurrent, which can be modified using different synthesis routes 4 , and 27 on particle density, which can vary with the deposition method of particles. Thus, design guidelines 28 on the particle arrangement and size of particle-based PEs can be determined with this model.…”

Nanostructure designs for effective solar-to-hydrogen conversion

“…Domen and co-workers demonstrated the possible application of (oxy)nitride semiconductors, such as Ta 3 N 5 [24] , SrNbO 2 N [25] , LaTiO x N y [26] , and TaON [27] , as photoanodes for water splitting by loading IrO 2 nanoparticles on their surfaces to suppress the self-oxidation of the photoanode and promote the oxidation of water. As shown in Figure 4 , the IrO 2 loading was found to greatly improve the activity and stability of these (oxy)nitride photoelectrodes during photoirradiation.…”