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

preprint
submitted on 03.05.2018 and posted on 04.05.2018 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.

Funding

EP/N004884/1

History

Email Address of Submitting Author

ssprick@liverpool.ac.uk

Email Address(es) for Other Author(s)

yangbai@liverpool.ac.uk cma@liverpool.ac.uk djwoods@liverpool.ac.uk aicooper@liverpool.ac.uk

Institution

Department of Chemistry and Materials Innovation Factory, University of Liverpool

Country

United Kingdom

ORCID For Submitting Author

0000-0002-5389-2706

Declaration of Conflict of Interest

No conflict of interest

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