A superlattice interface and S-scheme heterojunction for ultrafast charge separation and transfer in photocatalytic H2 evolution

Sijie Wan, Wang Wang, Bei Cheng, Guoqiang Luo, Qiang Shen, Jiaguo Yu (), Jianjun Zhang (), Shaowen Cao () and Lianmeng Zhang
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Sijie Wan: Wuhan University of Technology
Wang Wang: Wuhan University of Technology
Bei Cheng: Wuhan University of Technology
Guoqiang Luo: Wuhan University of Technology
Qiang Shen: Wuhan University of Technology
Jiaguo Yu: China University of Geosciences
Jianjun Zhang: China University of Geosciences
Shaowen Cao: Wuhan University of Technology
Lianmeng Zhang: Wuhan University of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: Abstract The rapid recombination of photoinduced charge carriers in semiconductors fundamentally limits their application in photocatalysis. Herein, we report that a superlattice interface and S-scheme heterojunction based on Mn0.5Cd0.5S nanorods can significantly promote ultrafast charge separation and transfer. Specifically, the axially distributed zinc blende/wurtzite superlattice interfaces in Mn0.5Cd0.5S nanorods can redistribute photoinduced charge carriers more effectively when boosted by homogeneous internal electric fields and promotes bulk separation. Accordingly, S-scheme heterojunctions between the Mn0.5Cd0.5S nanorods and MnWO4 nanoparticles can further accelerate the surface separation of charge carriers via a heterogeneous internal electric field. Subsequent capture of the photoelectrons by adsorbed H2O is as fast as several picoseconds which results in a photocatalytic H2 evolution rate of 54.4 mmol·g−1·h−1 without any cocatalyst under simulated solar irradiation. The yields are increased by a factor of ~5 times relative to control samples and an apparent quantum efficiency of 63.1% at 420 nm is measured. This work provides a protocol for designing synergistic interface structure for efficient photocatalysis.

Date: 2024
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DOI: 10.1038/s41467-024-53951-6

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