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Abstract:
Two novel metal-free organic dyes, namely the mono-anchoring KMT1 and di-anchoring KMT2 dyes, have been synthesized to function as photosensitizers for utilizing in photocatalytic hydrogen production systems. They adopt the donor-donor-pi-acceptor and donor-donor-(-pi-acceptor)2 configurations, respectively, featuring triphenylamine and fluorene moieties as electron donors, thiophene as the pi-bridges and cyanoacrylic acid as the acceptors/anchoring groups. It was found that the photocatalytic performance of the di-anchoring dye significantly outperforms that of its mono-anchoring counterpart. KMT2-based photocatalytic system demonstrated remarkable performance, producing 3520 mu mol (84.9 mL) of hydrogen over a span of 257 hours under blue light irradiation, with a turnover number (TON) of 56300, a turnover frequency (TOFi) of 1862.7 h-1, an initial hydrogen production activity (activityi) of 1164180 and an apparent quantum yield (AQYi %) of 19.9. This performance is among the top-tier when compared to other dyes used in similar photocatalytic systems. The results clearly illustrate that the di-anchoring dye possesses several advantages, including a broad absorption spectrum, higher absorptivity, and a relatively slower charge recombination rate. These attributes collectively contribute to its superior overall performance in photocatalysis.
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CHEMCATCHEM
ISSN: 1867-3880
Year: 2024
Issue: 21
Volume: 16
3 . 8 0 0
JCR@2023
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 1
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