Efficient photocatalytic oxygen evolution using BaTaO2N obtained from nitridation of perovskite-type oxide

2020 ◽  
Vol 8 (3) ◽  
pp. 1127-1130 ◽  
Author(s):  
Shraddha Jadhav ◽  
Shuta Hasegawa ◽  
Takashi Hisatomi ◽  
Zheng Wang ◽  
Jeongsuk Seo ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Perovskite Type Oxide ◽  
Perovskite Type

Designing stoichiometric, isostructural precursor oxides opens opportunities for the development of (oxy)nitride photocatalysts.

scholarly journals Oxygen Evolution Activity of LaNbN2O-Based Photocatalysts Obtained from Nitridation of a Precursor Oxide Structurally Modified by Incorporating Volatile Elements

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 566
Author(s):  
Shwetharani Ramu ◽  
Takashi Hisatomi ◽  
Kazunari Domen
Keyword(s):  
Oxygen Evolution ◽  
Apparent Quantum Yield ◽  
Volatile Elements ◽  
New Approach ◽  
Long Wavelength ◽  
Agno3 Solution ◽  
Highly Active ◽  
Perovskite Type Oxide ◽  
Oxide Particles ◽  
Perovskite Type

The perovskite-type oxynitride LaNbN2O is a photocatalyst that can evolve oxygen from aqueous solutions in response to long-wavelength visible light. However, it is challenging to obtain active LaNbN2O because of the facile reduction of Nb5+ during the nitridation of the precursor materials. The present study attempted to synthesize a perovskite-type oxide La0.6Na0.4Zn0.4Nb0.6O3, containing equimolar amounts of La3+ and Nb5+ in addition to volatile Na+ and Zn2+, followed by the nitridation of this oxide to generate LaNbN2O. The obtained oxide was not the intended single-phase material but rather comprised a cuboid perovskite-type oxide similar to La0.5Na0.5Zn0.33Nb0.67O3 along with spherical LaNbO4 particles and other impurities. A brief nitridation was found to form a LaNbN2O-like shell structure having a light absorption onset of approximately 700 nm on the cuboid perovskite-type oxide particles. This LaNbN2O-based photocatalyst, when loaded with a CoOx cocatalyst, exhibited an apparent quantum yield of 1.7% at 420 nm during oxygen evolution reaction from an aqueous AgNO3 solution. This was more than double the values obtained from the nitridation products of LaNbO4 and LaKNaNbO5. The present work demonstrates a new approach to the design of precursor oxides that yield highly active LaNbN2O and suggests opportunities for developing efficient Nb-based perovskite oxynitride photocatalysts.

First-principles Studies of Phase Stability and the Neutral Atomic Vacancies in LiNbO3, NaNbO3 and KNbO3

2005 ◽  
Vol 902 ◽  
Author(s):  
Akio Shigemi ◽  
Takahiro Wada
Keyword(s):  
Enthalpy Of Formation ◽  
Density Functional ◽  
Formation Energy ◽  
Type Structure ◽  
Enthalpies Of Formation ◽  
Functional Formalism ◽  
Reducing Atmosphere ◽  
Perovskite Type Oxide ◽  
Formation Energies ◽  
Perovskite Type

AbstractWe overall evaluated the enthalpies of formation and the formation energies of neutral vacancies in ANbO3 (A = Li, Na, K) using a plane-wave pseudopotential method within a density functional formalism. The LiNbO3 phase with the LiNbO3-type structure was confirmed to have lower enthalpy of formation than that with perovskite- or ilmenite-type structure. The NaNbO3 (R3c) and KNbO3 (Bmm2 and R3m) phases with the lowest symmetry were found to have the lowest enthalpy of formation. The formation energy of a A vacancy was found to be the lowest under an oxidizing atmosphere and that of an O vacancy was found to be the lowest under a reducing atmosphere. The formation energy of a Nb vacancy was the highest under both oxygen-rich and -poor conditions. These results are in agreement with the empirical rule that B site defects in perovskite-type oxide do not exist.

The effect of carbon–polyaniline hybrid coating on high-temperature electrochemical performance of perovskite-type oxide LaFeO3 for MH–Ni batteries

2015 ◽  
Vol 17 (27) ◽  
pp. 18185-18192 ◽  
Author(s):  
Yaru Pei ◽  
Wenkai Du ◽  
Yuan Li ◽  
Wenzhuo Shen ◽  
Yunchai Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Electrochemical Performance ◽  
Hybrid Coating ◽  
Perovskite Type Oxide ◽  
Perovskite Type

An efficient carbon–polyaniline (PANI)-coated method was applied for perovskite-type oxide LaFeO3 to enhance its high-temperature electrochemical performance.

Is ReO3 a mixed ionic–electronic conductor? A DFT study of defect formation and migration in a BVIO3 perovskite-type oxide

2018 ◽  
Vol 20 (12) ◽  
pp. 8008-8015 ◽  
Author(s):  
J. P. Parras ◽  
A. R. Genreith-Schriever ◽  
H. Zhang ◽  
M. T. Elm ◽  
T. Norby ◽  
...  
Keyword(s):  
Defect Formation ◽  
Dft Study ◽  
Lithium Ions ◽  
Electronic Conductor ◽  
Hydronium Ions ◽  
Perovskite Type Oxide ◽  
Mixed Ionic Electronic Conductor ◽  
And Migration ◽  
Oxide Ions ◽  
Perovskite Type

Unexpected behaviour of the migration energetics of oxide ions, hydronium ions and lithium ions in perovskite-structured ReO3.

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