2D/2D ReS2/CdS nanosheets-on-nanoribbon heterostructure for highly efficient H2 evolution under visible light irradiation

Abstract

Solar-driven water splitting is a promising renewable method for producing green H₂. However, its efficiency remains insufficient for practical applications due to significant charge recombination. To address this issue, strategies involving morphology modulation and heterostructure construction were employed to synthesize a novel 2D/2D ReS₂/CdS nanosheets-on-nanoribbon heterostructure. In this structure, the CdS nanoribbon, characterized by a wide and short charge transfer path and high crystallization, was first fabricated using a mild solvothermal approach, demonstrating potential to retard bulk charge recombination. Additionally, the well-defined heterostructure, promoting charge transfer and separation across interface, significantly inhibits surface charge recombination. As a result, the ReS₂/CdS heterostructure exhibits a state-of-the-art H₂ generation rate of 150.1 mmol g⁻¹ h⁻¹ which is ca. 115.5 times higher than pristine CdS far exceeding other similar catalytic systems and most CdS-noble metal photocatalysts. Combing two strategies to suppress charge recombination in this manuscript provides new insights into the development of low cost but high-performance catalysts for renewable energy generation.