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Unravelling the water oxidation mechanism on NaTaO3-based photocatalysts

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/c9ta14235e· OSTI ID:1778119
 [1];  [2];  [3];  [4];  [5];  [5];  [4];  [5]
  1. Chinese Academy of Sciences (CAS), Dailan (China); University of Chinese Academy of Sciences, Beijing (China); Department of Chemical and Biological Engineering
  2. Chinese Academy of Sciences (CAS), Dailan (China); University of Chinese Academy of Sciences, Beijing (China)
  3. Chinese Academy of Sciences (CAS), Dailan (China); Dalian Ocean University (China)
  4. State Univ. of New York (SUNY), Buffalo, NY (United States)
  5. Chinese Academy of Sciences (CAS), Dailan (China)
Understanding the detailed kinetics and mechanisms of water oxidation is crucial because water oxidation is the bottleneck reaction in overall water splitting. In this work, 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)=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=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.
Research Organization:
State Univ. of New York (SUNY), Buffalo, NY (United States)
Sponsoring Organization:
Ministry of Science and Technology of China; National Natural Science Foundation of China (NSFC); Natural Science Foundation of Liaoning Province; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0019086
OSTI ID:
1778119
Alternate ID(s):
OSTI ID: 1606607
OSTI ID: 1778160
Journal Information:
Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 14 Vol. 8; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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