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Oxygen evolution at the BiVO₄-water interface: mechanism of the water dehydrogenation reaction

Sai Lyu1*, Julia Wiktor1*, Alfredo Pasquarello1*

1 Chaire de Simulation à l'Echelle Atomique (CSEA), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

* Corresponding authors emails: sai.lyu@epfl.ch, julia.wiktor@chalmers.se, alfredo.pasquarello@epfl.ch
DOI10.24435/materialscloud:7w-9v [version v1]

Publication date: Sep 16, 2022

How to cite this record

Sai Lyu, Julia Wiktor, Alfredo Pasquarello, Oxygen evolution at the BiVO₄-water interface: mechanism of the water dehydrogenation reaction, Materials Cloud Archive 2022.116 (2022), doi: 10.24435/materialscloud:7w-9v.

Description

We study the water dehydrogenation reaction at the BiVO₄(010)-water interface by combining nudged-elastic-band calculations and electronic structure calculations at the hybrid functional level. We investigate the pathway and the kinetic barrier for the adiabatic reaction going from the hole polaron localized in BiVO₄ to the dehydrogenation of the adsorbed water molecule at the interface. The reaction is found to involve the H2O•⁺ radical cation as intermediate, to have a kinetic barrier of 0.7 eV, and to be initiated by the electron transfer. The calculated kinetic barrier is in good agreement with experiment and is consistent with the slow hole transfer kinetics observed at the surface of BiVO₄. To characterize the structural changes occurring during this process, we analyze the O-H distances for three relevant water molecules. We also examine the Wannier functions around the O atom of the adsorbate involved in the reaction to reveal the changes in the electronic structure during the hole hopping. The projected density of states of the lowest unoccupied molecular orbitals allows us to identify the atomic orbitals that are primarily involved in the reaction. We expect that the proposed reaction mechanism generally holds when the surface coverage is dominated by molecularly adsorbed water.

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File name Size Description
trxyz.zip
MD5md5:4b54c81b2c19d727f73729e7e6e4dda0
243.4 KiB The CP2K input file and the atomic coordinate files (in XYZ format) of the 35 replicas used in this study are given.

License

Files and data are licensed under the terms of the following license: Creative Commons Attribution 4.0 International.
Metadata, except for email addresses, are licensed under the Creative Commons Attribution Share-Alike 4.0 International license.

External references

Journal reference
S. Lyu, J. Wiktor, A. Pasquarello, ACS Catal. 12, 11734–11742 (2022) doi:https://doi.org/10.1021/acscatal.2c03331

Keywords

MARVEL Water Dehydrogenation Reaction Metal Oxide

Version history:

2022.116 (version v1) [This version] Sep 16, 2022 DOI10.24435/materialscloud:7w-9v