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Spatially separating redox centers on 2D carbon nitride with cobalt single atom for photocatalytic H₂O₂ production
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Spatially separating redox centers on 2D carbon nitride with cobalt single atom for photocatalytic H₂O₂ production
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Journal Article
Spatially separating redox centers on 2D carbon nitride with cobalt single atom for photocatalytic H₂O₂ production
2020
Overview
Redox cocatalysts play crucial roles in photosynthetic reactions, yet simultaneous loading of oxidative and reductive cocatalysts often leads to enhanced charge recombination that is detrimental to photosynthesis. This study introduces an approach to simultaneously load two redox cocatalysts, atomically dispersed cobalt for improving oxidation activity and anthraquinone for improving reduction selectivity, onto graphitic carbon nitride (C₃N₄) nanosheets for photocatalytic H₂O₂ production. Spatial separation of oxidative and reductive cocatalysts was achieved on a two-dimensional (2D) photocatalyst, by coordinating cobalt single atom above the void center of C₃N₄ and anchoring anthraquinone at the edges of C₃N₄ nanosheets. Such spatial separation, experimentally confirmed and computationally simulated, was found to be critical for enhancing surface charge separation and achieving efficient H₂O₂ production. This center/edge strategy for spatial separation of cocatalysts may be applied on other 2D photocatalysts that are increasingly studied in photosynthetic reactions.
Publisher
National Academy of Sciences
Subject
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