- Title
- Engineering defects in TiO2 for the simultaneous production of hydrogen and organic products
- Creator
- Zhang, Jiajun; Toe, Cui Ying; Kumar, Priyank; Scott, Jason; Amal, Rose
- Relation
- Applied Catalysis B: Environmental Vol. 333, Issue 15 September 2023, no. 122765
- Publisher Link
- http://dx.doi.org/10.1016/j.apcatb.2023.122765
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2023
- Description
- Photoreforming ethanol to simultaneously produce hydrogen and value-added organic products was realized over defected TiO2. Chemically induced defects in TiO2 promoted light absorption and charge separation, enhancing overall photoactivity. The induced defects also regulated product selectivity, leading to greater hydrogen purity and liquid to gaseous carbon ratio. The optimal catalyst generated 0.08 mmol/hr of hydrogen with a purity greater than 99 % and 0.08 mmol/hr of liquid acetaldehyde over a 6 hr timeframe. This was three times greater than the untreated TiO2. Active species trapping revealed that the preferred ethanol oxidation pathway was direct hole transfer, indicating the selectivity relies on surface chemisorption. Surface defects decreased the acetaldehyde adsorption energy, instigating its prompt desorption and suppressing overoxidation into CO2, thus improving the selectivity towards hydrogen and liquid hydrocarbon products. The work offers an alternative approach towards sustainable energy by coupling photocatalysis with waste organic utilization.
- Subject
- sphotoreforming; alcohols; defect engineering; titanium dioxide; SDG 7; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1482171
- Identifier
- uon:50871
- Identifier
- ISSN:0926-3373
- Rights
- © 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
- Language
- eng
- Full Text
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Goal 7: Ensure access to affordable, reliable, sustainable and modern energy
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