Abstract
Linear poly(p‐phenylene)s are modestly active UV photocatalysts for hydrogen production in the presence of a sacrificial electron donor. Introduction of planarized fluorene, carbazole, dibenzo[b,d]thiophene or dibenzo[b,d]thiophene sulfone units greatly enhances the H2 evolution rate. The most active dibenzo[b,d]thiophene sulfone co‐polymer has a UV photocatalytic activity that rivals TiO2, but is much more active under visible light. The dibenzo[b,d]thiophene sulfone co‐polymer has an apparent quantum yield of 2.3 % at 420 nm, as compared to 0.1 % for platinized commercial pristine carbon nitride.
Highlights
Linear poly(p-phenylene)s are modestly active UV photocatalysts for hydrogen production in the presence of a sacrificial electron donor
There has been a surge of interest recently in light-driven water splitting using organic rather than inorganic photocatalysts
We recently showed that conjugated microporous polymers (CMPs) have potential for photocatalytic hydrogen evolution, and in particular that their synthesis lends itself to fine control over photophysical properties, such as the optical gap.[15,16]
Summary
Linear poly(p-phenylene)s are modestly active UV photocatalysts for hydrogen production in the presence of a sacrificial electron donor. We synthesized a series of poly(p-phenylene)s (P1K, P1S) and analogous conjugated co-polymers that incorporated planarized units; that is, fluorenes (P2, P3), carbazoles (P4, P5) and dibenzo[b,d]thiophene (P6). The photocatalytic activity was tested for these polymers both under broad-spectrum irradiation (> 295 nm; Figure 2, Table 1) and under filtered, visible light (> 420 nm; Table 1).
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