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Higher hydrogen production by photocatalytic water splitting using a hollow tubular graphitic carbon nitride-zinc telluride composite

Abstract

Energy demand and pollution due to urbanization and industrialization are calling for clean energies such as dihydrogen (H2) obtained by water splitting. For that, zinc telluride is a promising semiconductor having a narrow bandgap that can absorb a large amount of visible light and promotes the separation of charge carriers. Here, we prepared a 1D hollow tubular graphitic carbon nitride (g-C3N4) composite (h-CN) by a precipitation using melamine as a precursor. Results show that composite produces higher yields of dihydrogen, of 11,188 μmol g−1 h−1, than with ZnTe, of 8331 μmol g−1 h−1, and with h-CN, of 1012 μmol g−1 h−1. Furthermore, the new modified heterojunction displays quantum efficiency of about 17.1% at 420 nm, which is much higher than for h-CN, of 0.87%, and for ZnTe, of 7.29%. Higher performances are explained by reducing the charge recombination and increasing the transfer of electrons by creating a strong p-n heterojunction. An advantage of the new photocatalyst is that it does not require an expensive noble metal.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51978569, 51908458), and China Postdoctoral Science Foundation (2019M650264).

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Correspondence to Guorui Yang or Wei Yan.

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Nasir, M.S., Yang, G., Ayub, I. et al. Higher hydrogen production by photocatalytic water splitting using a hollow tubular graphitic carbon nitride-zinc telluride composite. Environ Chem Lett 20, 19–26 (2022). https://doi.org/10.1007/s10311-021-01301-z

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  • DOI: https://doi.org/10.1007/s10311-021-01301-z

Keywords

  • Energy
  • Hydrogen
  • Photocatalyst
  • Hollow
  • ZnTe