报告题目：Porous and Non-porous Conjugated Polymers Photocatalysts for Light-driven Hydrogen Evolution
报 告 人：R. Sebastian Sprick (Research Coordinator, University of Liverpool, UK)
Photocatalytic hydrogen production from water is a research area of immense interest as hydrogen has been identified as a potential energy carrier of the future. Most of the studied photocatalysts are inorganic and organic materials have been far less studied. In this contribution, we will present the application of conjugated microporous polymers (CMPs) as catalysts for photocatalytic hydrogen evolution. The optical band gap of the polymers was fine-tuned over a broad range by varying the amount co-monomer incorporated in a Suzuki-Miyaura type copolymerization. These polymer networks show permanent intrinsic microporosity and exhibit apparent Brunauer-Emmet-Teller (BET) specific surface areas in the range 500–1000 m2/g as measured by nitrogen adsorption at 77 K. The CMPs were found to be highly active for photocatalytic hydrogen evolution from water in the presence of a sacrificial electron donor, without the need for an added metal co-catalyst. Linear analogues of these CMPs were also found to show photocatalytic activity and we started to investigate if we can further improve the performance of these linear analogues and find principles that can be applied to CMPs. For linear conjugated polymers the introduction of planarized chromophores has been shown to significantly increase charge-carrier mobilites and enhances separation of hole-electron pairs. As these physical properties are important factors in photocatalytic hydrogen evolution we decided to explore whether planarization could be used as a strategy in our materials to enhance performance. Although poly(p-phenylene)s are only modestly active UV photocatalysts for hydrogen production, the introduction of planarized fluorene, carbazole, dibenzothiophene, or dibenzothiophene sulfone chromophores greatly enhances the UV and visible light H2 evolution rates. The concept of planarization was found to be transferable and was shown to enhance photocatalytic performance in conjugated microporous polymers. The relationship between linker length and substitution with photocatalytic activity has also been explored for these materials.
2015-Present Research Coordinator, University of Liverpool, UK
2013-2015 Postdoctoral Research Associate, University of Liverpool, UK
2009-2013 Ph.D., Organic Materials Innovation Centre, the University of Manchester, UK
2008-2009 Master of Science (Grade 1.3), Chemistry, Bergische Universität, Wuppertal, Germany
2004-2008 Bachelor of Science, Chemistry, Bergische Universität, Wuppertal, Germany