Photocatalytic Water Splitting (TiO₂)

2H₂O → 2H₂ + O₂

Visão geral

Titanium dioxide absorbs UV light and generates electron-hole pairs that can split water into hydrogen and oxygen. Discovered by Fujishima and Honda in 1972, this reaction is the basis of artificial photosynthesis research. The bandgap of TiO₂ (3.2 eV) limits absorption to UV, so researchers are developing visible-light photocatalysts.

Participantes

Papel	Substância	Coeficiente	Estado
Reagente	Water H₂O	2	(l)

Exemplo do cotidiano

Self-cleaning glass windows are coated with TiO₂ that photocatalytically decomposes organic dirt when exposed to sunlight.

Importância industrial

A dissociação fotocatalítica da água poderá produzir hidrogénio verde a partir de luz solar e água, um objetivo fundamental da investigação em energias renováveis.

Propriedades

Tipo: Photochemical
Reversível: Não
Energia: Endotérmico
ΔH: 572,0 kJ/mol
Catalisador: TiO₂ (titanium dioxide)

Reações relacionadas

Cis-Trans Isomerization of Retinal Silver Chloride Photodecomposition Luminol Chemiluminescence Firefly Bioluminescence (Luciferin Oxidation) Photolysis of Water (Vacuum UV) Photochemical Smog Formation (NO₂ Photolysis) Photodegradation of Methylene Blue by TiO₂ Photodissociation of Chlorine Gas Silver Bromide Photodecomposition Chlorophyll Fluorescence

Frequently Asked Questions

What is the equation for Photocatalytic Water Splitting (TiO₂)?

The balanced equation is: 2H₂O → 2H₂ + O₂.

What type of reaction is Photocatalytic Water Splitting (TiO₂)?

Photocatalytic Water Splitting (TiO₂) is a photochemical reaction.

Is Photocatalytic Water Splitting (TiO₂) exothermic or endothermic?

Photocatalytic Water Splitting (TiO₂) is endothermic (absorbs energy). The enthalpy change (ΔH) is 572.0 kJ/mol.

What conditions are needed for Photocatalytic Water Splitting (TiO₂)?

This reaction requires a catalyst (TiO₂ (titanium dioxide)).