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Photocatalytic Hydrogen Evolution from Water Using Heterocyclic Conjugated Microporous Polymers: Porous or Non-Porous?

submitted on 03.05.2018, 17:06 and posted on 04.05.2018, 12:12 by Reiner Sebastian Sprick, Yang Bai, Catherine M. Aitchison, Duncan J. Woods, Andrew I. Cooper

Three series of conjugated microporous polymers (CMPs) were studied as photocatalysts for producing hydrogen from water using a sacrificial hole-scavenger. In all cases, dibenzo[b,d]thiophene sulfone polymers outperformed their fluorene analogs. A porous network, S-CMP3, showed the highest hydrogen evolution rate of 6076 µmol h-1 g-1 (λ > 295 nm) and 3106 µmol h-1 g-1 (λ > 420 nm), with an external quantum efficiency of 13.2% at 420 nm. S-CMP3 outperforms its linear structural analog, P35, while in other cases, non-porous linear polymers are superior to equivalent porous networks. This suggests that microporosity can be beneficial for sacrificial photocatalytic hydrogen evolution, but not for all monomer combinations.




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Department of Chemistry and Materials Innovation Factory, University of Liverpool


United Kingdom

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