1. Cocreation of photogenerated electron and hole collectors on polymeric carbon nitride synergistically promotes carrier separation and reaction kinetics towards propelling photocatalytic hydrogen evolution.
- Author
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Li, Jiaming, Han, Jinlong, Zou, Xiyue, Xu, Na, Gu, Fang, Su, Nan, Li, Chunmei, and Dong, Hongjun
- Subjects
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CHEMICAL kinetics , *NITRIDES , *HYDROGEN evolution reactions , *ELECTRONS , *HETEROJUNCTIONS , *NANODOTS , *HYDROGEN - Abstract
[Display omitted] • Ir-PCN/IrO 2 photocatalyst is prepared based on one-step dual-modulation strategy. • IrO 2 nanodots as hole collector are modified at the edge of PCN nanosheets. • Ir atoms as electron collector are implanted in the skeleton of PCN. • The carrier separation efficiency and reaction kinetics are improved. • The photocatalytic hydrogen evolution performance is propelled greatly. It is a challenging issue for the creation of photogenerated carrier collectors on the photocatalyst to drive charge separation and promote reaction kinetics in the photocatalytic reaction. Herein, based on one-step dual-modulation strategy, IrO 2 nanodots are modified at the edge of polymeric carbon nitride (PCN) nanosheets and atomically dispersed Ir atoms are implanted in the skeleton of PCN to obtain a unique Ir-PCN/IrO 2 photocatalyst. IrO 2 nanodots and atomically dispersed Ir atoms act as hole and electron collectors to synergistically promote the carrier separation and reaction kinetics, respectively, thereby greatly improving the photocatalytic hydrogen evolution (PHE) performance. As a result, without adding additional cocatalyst, the PHE rate over the optimal Ir-PCN/IrO 2 -2% sample reaches up to 1564.4 μmol h−1 g−1 under the visible light irradiation, with achieving an apparent quantum yield (AQY) of 15.7% at 420 nm. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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