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Unravelling the water oxidation mechanism on NaTaO3-based photocatalysts

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Abstract

Understanding the detailed kinetics and mechanisms of water oxidation is crucial because water oxidation is the bottleneck reaction in overall water splitting. Here, we investigated photocatalytic water oxidation on NaTaO3-based photocatalysts. With in situ FT-IR spectroscopy, two new water oxidation intermediates with IR absorption peaks centered at 1058 and 935 cm−1 were observed and assigned to Ta(VI)[double bond, length as m-dash]O and Ta(O2) peroxo species, respectively. With H218O as the reactant and NaTa16O3 as the photocatalyst, both 16O18O and 18O2 were evolved continuously from overall water splitting as analyzed by mass spectroscopy (MS), demonstrating that the lattice O atoms in NaTaO3-based photocatalysts participate in the formation of O2 during the reaction. DFT results are consistent with the formation of Ta[double bond, length as m-dash]O, 16O18O and 18O18O intermediates and products, while predicting that several water oxidation pathways are thermodynamically accessible for water oxidation on NaTaO3. Based on these observations, we propose a three-step two-site mechanism for photocatalytic water oxidation on NaTaO3-based photocatalysts in which lattice oxygen plays a key role. The elucidation of the present mechanism should help in broadly understanding water oxidation on semiconductor-based photocatalysts.

Graphical abstract: Unravelling the water oxidation mechanism on NaTaO3-based photocatalysts

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Article information


Submitted
31 Dec 2019
Accepted
10 Mar 2020
First published
12 Mar 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Unravelling the water oxidation mechanism on NaTaO3-based photocatalysts

Q. Ding, Y. Liu, T. Chen, X. Wang, Z. Feng, X. Wang, M. Dupuis and C. Li, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA14235E

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