Abstract
The p–n type Sm2WO6-Co9S8 heterojunction with two-dimensional coupling interface was successfully synthesized by electrostatic self-assembly. The unique rhombic morphology of Sm2WO6 and Co9S8 nanoparticles also effectively improve the light utilization efficiency. The intervention of Co9S8 enhances the visible light absorption capacity of m2WO6/Co9S8. The Sm2WO6/Co9S8 greatly increases the specific surface area and provides a rich reaction site. Recombination of photogenerated carriers in Sm2WO6/Co9S8 heterojunctions is effectively inhibited. The p–n type Sm2WO6-Co9S8 heterojunction results show that the optimized Sm2WO6/Co9S8 heterojunction exhibits significant hydrogen evolution activity, and the optimal Sm2WO6/Co9S8-25 composite has 117.5 μmol hydrogen evolution activity, it’s close to four times Co9S8, close to 143 times Sm2WO6. The stability of the composite Sm2WO6/Co9S8 is the better. Under the built-in electric field induced by p–n heterojunction, using of p–n heterojunction interactions and electron transport modes, the Sm2WO6/Co9S8 can effectively achieve the remarkable effect of its internal carrier separation. This work also provides new opportunities for studying rare earth element tungstate photocatalysts.
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Acknowledgements
This work was financially supported by the Fundamental Research Funds for the Xixia District Science and Technology Plan Project (XXKJ1901) and also was supported by the Central Universities of North University for Nationalities (2021KJCX02). This work was financially supported by the Natural Science Foundation of Ningxia Province (2021AAC03180).
Funding
Funding was provided by Central Universities of North University for Nationalities (Grant No. 2021KJCX02), Xixia District Science and Technology Plan Project (Grant No. XXKJ1901) and Natural Science Foundation of Ningxia Province (Grant No. 2021AAC03180).
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Li, Z., Xu, J., Liu, Z. et al. Construction of p–n Heterojunctions by Co9S8 Modified Rare-Earth Metal Sm-Tungstates for Photocatalytic Hydrogen Evolution. Catal Lett 154, 1322–1335 (2024). https://doi.org/10.1007/s10562-023-04397-w
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DOI: https://doi.org/10.1007/s10562-023-04397-w