Efficient and Stable Co3O4/ZnO Nanocomposite for Photochemical Water Splitting

Abstract

In this study, an efficient Co3O4/ZnO based composite was prepared by the low temperature aqueous chemical growth method for photoelectrochemical water splitting. Both ZnO and Co3O4 constituents are identified in the composite sample through X-ray diffraction technique. Scanning electron microscopy has shown the nanorod like morphology of ZnO with etched top surface. The energy dispersive spectroscopy has shown the presence of cobalt, oxygen and zinc as the main elements in the composite samples. The Co3O4/ZnO composite (with low content of cobalt chloride hexahydrate) shows a significant increase in the photocurrent density (3 mA/cm2 at 0.5 V vs Ag/AgCl, which is 10 times higher than the pristine ZnO). Importantly, a fast and stable photocurrent response is found at an illumination of 1 Sun of light. The superior performance of the Co3O4/ZnO composite system is attributed to the facile promotion of electron–hole charge carrier separation and favourable charge transport. Furthermore, the electrochemical impedance spectroscopy showed a small charge transfer resistance of 259.30 Ohms for the composite material and consequently a robust water splitting is obtained. The prepared composite is earth abundant, inexpensive and scalable, therefore it can be used for diverse applications.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgement

We extend our sincere appreciation to the Researchers Supporting Project number (RSP-2020/79) at King Saud University, Riyadh, Saudi Arabia.

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Correspondence to Zafar Hussain Ibupoto.

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Tahira, A., Ibupoto, Z.H., Nafady, A. et al. Efficient and Stable Co3O4/ZnO Nanocomposite for Photochemical Water Splitting. J Clust Sci (2021). https://doi.org/10.1007/s10876-021-01980-2

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Keywords

  • ZnO
  • Co3O4
  • Photoelectrochemical water splitting
  • Water oxidation