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Light-induced water splitting by titanium-tetrahydroxide: a computational study.

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  • 1VU University Amsterdam, Theoretical Chemistry, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands. a.k.kazaryan@gmail.com.

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Summary
This summary is machine-generated.

Titanium hydroxide (Ti(OH)4) can split water to produce oxygen and hydrogen. Excited state Ti(OH)4 facilitates hydrogen abstraction, a key step in water oxidation, with low energy barriers.

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Area of Science:

  • Computational chemistry
  • Materials science
  • Photocatalysis

Background:

  • Water splitting is crucial for sustainable energy production.
  • Titanium hydroxide (Ti(OH)4) is a potential catalyst for water oxidation.
  • Understanding reaction mechanisms at the molecular level is essential for catalyst design.

Purpose of the Study:

  • To investigate the mechanism of water oxidation by Ti(OH)4 in both ground and excited states.
  • To determine the reaction pathways and energy barriers for O2 and H2 production.
  • To elucidate the role of excited states in the catalytic activity of Ti(OH)4.

Main Methods:

  • Density functional theory (DFT) calculations, including the Delta self-consistent field (ΔSCF) and time-dependent DFT (TDDFT) methods.
  • Coupled cluster (CCSD, CCSD(T)) calculations for method validation.
  • Modeling of solvent effects using explicit water molecules.

Main Results:

  • Water oxidation by Ti(OH)4 can occur via nucleophilic attack or H-atom abstraction.
  • H-atom abstraction is favored in the excited state with a low energy barrier (4-8 kcal mol(-1)), forming hydroxyl radicals (OH˙).
  • This excited-state H-abstraction is the rate-limiting step for O2 formation.
  • H2 production is a subsequent exothermic bimolecular reaction.

Conclusions:

  • Ti(OH)4, particularly in its excited state, is an effective catalyst for water oxidation.
  • The reaction proceeds through a series of H-abstraction steps, facilitated by photon absorption.
  • The findings provide molecular-level insights into photocatalytic water splitting mechanisms.