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Construction of S-scheme MnO2@CdS heterojunction with core–shell structure as H2-production photocatalyst

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Abstract

Artificial photosynthesis is deemed as an efficient protocol for transforming abundant solar energy into valuable fuel. In this paper, the well-defined one-dimensional (1D) core–shell MnO2@CdS hybrids were constructed by employing MnO2 nanotubes and CdS nanoparticles as nano-building blocks via a chemical co-precipitation route. The rationally designed core–shell structure provided an intimate heterojunction interface between the CdS shell and MnO2 core. All the MnO2@CdS core–shell nanocomposites possess higher H2 evolution rate through visible light irradiation contrary to pristine CdS, and the optimal MnO2@CdS hybrid exhibits the utmost H2 evolution rate of 3.94 mmol·g−1·h−1, which is 2.8-fold higher compared with that of CdS. Appertaining to XPS and Mott-Schottky (M-S) analysis, such enhanced photocatalytic H2 generation of MnO2@CdS heterojunction was ascribed to an S-scheme mechanism, which suppressed the charge recombination along with a fast detachment of electron–hole pairs (e−–h+) and significantly improved the severance of carriers, thus improved H2 evolution performance. These findings envision a new insight into the development of S-scheme heterostructure for photocatalytic H2 generation.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51672113, 21975110 and 21972058).

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Author notes

  1. Syed Zulfiqar and Song Liu contributed equally to this work.

Authors and Affiliations

  1. School of Material Science and Engineering, Jiangsu University, Zhenjiang, 212013, China

    Syed Zulfiqar, Song Liu, Nasir Rahman, Hua Tang, Sufaid Shah, Xiao-Hui Yu & Qin-Qin Liu

  2. Department of Physics, Abdul Wali Khan University, Mardan, KP 23200, Pakistan

    Syed Zulfiqar

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  1. Syed Zulfiqar
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  2. Song Liu
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  3. Nasir Rahman
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  4. Hua Tang
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Correspondence to Hua Tang or Qin-Qin Liu.

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Zulfiqar, S., Liu, S., Rahman, N. et al. Construction of S-scheme MnO2@CdS heterojunction with core–shell structure as H2-production photocatalyst. Rare Met. 40, 2381–2391 (2021). https://doi.org/10.1007/s12598-020-01616-w

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