Developing
efficient and wide spectrally acting photocatalysts
for light-driven hydrogen production from water is highly desirable
for solar energy conversion. Herein, diketopyrrolopyrrole (DPP) is
used to combine with triphenylamine (TPA), bipyridyl (bdy), and biphenyl
(bph) units for construction of conjugated microporous polymer photocatalysts.
Although the synthesized two polymers, DPP-bdy-TPA and DPP-bph-TPA,
have a similar framework structure, the former bearing a hydrophilic
bipyridyl unit displays much better photocatalytic performance with
hydrogen production rates of 6918 and 2780 μmol g–1 h–1 under a full-arc xenon lamp and visible light
(>440 nm) illumination, respectively. Moreover, DPP-bdy-TPA has
a
wide photoaction spectrum with apparent quantum yields of 9.60% at
420 nm, 7.32% at 500 nm, and 0.31% at 600 nm, the so high values rarely
achieved by present-known organic semiconductor photocatalysts. These
results undoubtedly prove DPP is an excellent building block, and
this work well exemplifies its utilization for construction of high-performance
photocatalysts.
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