NDLI: <i>In situ</i> preparation of a novel organo-inorganic 6,13-pentacenequinone–TiO<sub>2</sub> coupled semiconductor nanosystem: a new visible light active photocatalyst for hydrogen generation

Content Provider	Royal Society of Chemistry (RSC)
Author	Gosavi, Suresh Park, Chan-Jin Mulik, Uttam Arbuj, Sudhir Hawaldar, Ranjit Kshirsagar, Pradnya Pandit, Vikram Kale, Bharat
Copyright Year	2015
Abstract	Previous studies related to the synthesis of stable UV-visible light active photocatalysts for hydrogen generation have been limited to inorganic semiconductors and their nano- and hetero-structures. We demonstrate here the use of an organo-inorganic 6,13-pentacenequinone (PQ)–TiO2 coupled semiconductor nanosystem as an efficient photocatalyst active in visible light for the production of hydrogen. Anatase TiO2 nanoparticles (3–5 nm) were uniformly decorated on thin sheets of monoclinic PQ by an in situ solvothermal method. These as-prepared PQ–TiO2 coupled semiconductor nanosystems had a band gap in the range 2.7–2.8 eV. The strong emission at 590 nm can be attributed to the transfer of electrons from the LUMO energy level of TiO2 to combine with the holes present in the HOMO level of PQ. This electron–hole recombination makes availability of electrons and holes in LUMO of PQ and HOMO of TiO2, respectively. This hybrid semiconductor coupled nanosystem resulted in a rate of hydrogen evolution of 36 456 μmol h−1 g−1 from H2S under UV-visible light; this is four times higher than the rate obtained with TiO2 in earlier reports of UV-visible light active photocatalysts. These results open up a new path to explore inorganic systems coupled with PQ as new photoactive hybrid catalysts in a number of chemical and physicochemical processes.
Starting Page	4338
Ending Page	4344
Page Count	7
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	8
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta06606e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	PQ Hydrogen Semiconductor Photocatalysis Anatase Monoclinic crystal system Nanotechnology Band gap Electronvolt Carrier generation and recombination Hydrogen sulfide
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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