Details

Autor(en) / Beteiligte

• Chen, Cheng
• Wu, Mingge
• Chen, Bolei
• Ma, Chunyan
• Song, Maoyong
• Jiang, Guibin

Titel

Triggering photocatalytic performance of La 2 Co x Mn 2-x O 6 via heat activation

Ist Teil von

• Proceedings of the National Academy of Sciences - PNAS, 2023-10, Vol.120 (44), p.e2310004120

Ort / Verlag

United States

Erscheinungsjahr

2023

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The La-based perovskite (LaBO ) exhibits excellent optical properties. However, its valence band (VB) potential is not sufficiently positive to reach the oxidation potential required for the cleavage of chemical bonds (such as benzylic C-H), limiting its application in photocatalysis. Herein, we report the unconventional effects of heat activation on the reduction of the dissociation energy of benzylic C-H and aqueous H-O, thereby triggering the photocatalytic activity of La Co Mn O perovskites. Additionally, we demonstrate that photocatalysis is the main contributor to substrate conversion in the selective oxidation of toluene and reduction of CO . Particularly, La Co Mn O shows excellent performance with a product yield of 550.00 mmol g and a toluene conversion of 22,866.67 μmol g h . To the best of our knowledge, this is the highest reported product yield for the selective oxidation of benzylic C-H bond of toluene. Our findings provide insight into the specific role of heat activation in photocatalysis, which is crucial for breaking and overcoming the VB barrier to realize challenging reactions.