3 years ago

Effective Prevention of Charge Trapping in Graphitic Carbon Nitride with Nanosized Red Phosphorus Modification for Superior Photo(electro)catalysis

Effective Prevention of Charge Trapping in Graphitic Carbon Nitride with Nanosized Red Phosphorus Modification for Superior Photo(electro)catalysis
Ruixue Zhu, Jimmy C. Yu, Lin Jing, David Lee Phillips
The high occurrence of trapped unreactive charges due to chemical defects seriously affects the performance of g-C3N4 in photocatalytic applications. This problem can be overcome by introducing ultrasmall red phosphorus (red P) crystals on g-C3N4 sheets. The elemental red P atoms reduce the number of defects in the g-C3N4 structure by forming new chemical bonds for much more effective charge separation. The product shows significantly enhanced photocatalytic activity toward hydrogen production. To the best of our knowledge, the hydrogen evolution rate obtained on this hybrid should be the highest among all P-containing g-C3N4 photocatalysts reported so far. The trapping and detrapping processes in this red P/g-C3N4 system are thoroughly revealed by using time-resolved transient absorption spectroscopy. Chemical bonding of elemental red phosphorus (red P) remediates the chemical defects in g-C3N4 structure. This would effectively suppress the charges trapping and prolong the lifetime of active charges in g-C3N4 during the photocatalytic applications. This optimized red P/g-C3N4 composite holds the highest record toward photocatalytic hydrogen production in the reported P-containing g-C3N4 systems to date.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201703484

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