Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 23, Pages 6848-6852Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201802278
Keywords
carbon nitrides; DNP NMR; hydrogen evolution; photocatalysis; polymers
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Funding
- Australian Research Council [DP150102515]
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Metal-free polymeric carbon nitrides (PCNs) are promising photocatalysts for solar hydrogen production, but their structure-photoactivity relationship remains elusive. Two PCNs were characterized by dynamic-nuclear-polarizationenhanced solid-state NMR spectroscopy, which circumvented the need for specific labeling with either C-13- or N-15-enriched precursors. Rapid 1D and 2D data acquisition was possible, providing insights into the structural contrasts between the PCNs. Compared to PCN_B with lower performance, PCN_P is a more porous and more active photocatalyst that is richer in terminal N-H bonds not associated with interpolymer chains. It is proposed that terminal N-H groups act as efficient carrier traps and reaction sites.
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