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Spectral-Selective Dual-Mode Photothermal Hydrogen Evolution over CdS/SnSe Heterojunctions with Tunable Excitonic-Heating Contributions
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DOI：10.1039/D6TA01796G.png)
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Abstract
En 中文
Photothermal catalysis can expand solar-to-hydrogen conversion by coupling visible-light excitonic charge generation with near-infrared (NIR) photothermal heating; yet rational tuning of the balance between these two driving forces remains unclear. Here; we engineer interfacial interactions in two CdS/SnSe heterojunctions to regulate a spectral-selective balance between excitonic heating and photothermal catalysis in photothermal catalytic water splitting. When p-type SnSe (SnSe-1) forms a p-n S-scheme heterojunction with CdS; efficient interfacial charge separation biases the composite toward an exciton-dominated regime; with photothermal heating providing auxiliary kinetic enhancement; yielding the highest hydrogen evolution activity under visible irradiation. In contrast; when SnSe is down-sized to an n-type; defect-rich variant (SnSe-2) with altered interfacial band alignment; the composite exhibits markedly stronger NIR-induced heating and shifts toward a heatingdominated regime while retaining interfacial charge participation; enabling superior hydrogen evolution under combined visible-NIR illumination. These results demonstrate that exciton-dominated and heating-dominated architectures can be selectively designed to maximize solar-driven hydrogen production across different spectral windows.
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