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Electronic band-offsets across Cu2O/BaZrO3 heterojunction and its stable photo-electro-chemical response: First-principles theoretical analysis and experimental optimization

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  • Sharma, Dipika
  • Upadhyay, Rishibrind Kumar
  • Satpati, Biswarup
  • Satsangi, Vibha R.
  • Shrivastav, Rohit
  • Waghmare, Umesh V.
  • Dass, Sahab

Abstract

Cu2O has been shown to be highly active as a cathode in photo-electro-chemical (PEC) reduction of water to generate hydrogen fuel using sunlight. However, Cu2O is susceptible to photo-corrosion when exposed to an electrolyte and needs to be protected by an over-layer of a suitable material, and its performance depends sensitively on its interface with the over-layer, and hence to the method of deposition. Here, we use first-principles theoretical analysis of the electronic structure of Cu2O/BaZrO3interface, and show that valence and conduction bands are favourably aligned to absorb light and catalyse the Hydrogen Evolution Reaction. We then present experiments with spray pyrolytically deposited Cu2O films and spin coated over-layer of BaZrO3, and optimize its PEC performance with thickness of Cu2O film. We find a maximum photocurrent density of1.25 mA/cm2 at 0.95 V/SCE for an overall thickness of 458 nm, and demonstrate that the photocurrent remains stable over a long period of time. Demonstration of scalable and cost effective deposition of Cu2O and BaZrO3with stable PEC performance and understanding of the mechanism of charge separation across the Cu2O/BaZrO3 interface developed here should facilitate further optimization of Cu2O/BaZrO3 films for realistic PEC applications.

Suggested Citation

  • Sharma, Dipika & Upadhyay, Rishibrind Kumar & Satpati, Biswarup & Satsangi, Vibha R. & Shrivastav, Rohit & Waghmare, Umesh V. & Dass, Sahab, 2017. "Electronic band-offsets across Cu2O/BaZrO3 heterojunction and its stable photo-electro-chemical response: First-principles theoretical analysis and experimental optimization," Renewable Energy, Elsevier, vol. 113(C), pages 503-511.
    • Handle: RePEc:eee:renene:v:113:y:2017:i:c:p:503-511
    DOI: 10.1016/j.renene.2017.06.022
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    References listed on IDEAS

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    1. P. Poizot & S. Laruelle & S. Grugeon & L. Dupont & J-M. Tarascon, 2000. "Nano-sized transition-metal oxides as negative-electrode materials for lithium-ion batteries," Nature, Nature, vol. 407(6803), pages 496-499, September.
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    1. Yadav, Jyoti & Raturi, Parul & Yadav, Sarjana & Singh, J.P., 2021. "Zig-zag Ag2S nanostructures for superior optical absorption and photoelectrochemical water splitting performance," Renewable Energy, Elsevier, vol. 179(C), pages 2256-2266.
    2. Kaur, Gurpreet & Divya, & Khan, Saif A. & Satsangi, Vibha R. & Dass, Sahab & Shrivastav, Rohit, 2021. "Nano-hetero-structured thin films, ZnO/Ag-(α)Fe2O3, with n/n junction, as efficient photoanode for renewable hydrogen generation via photoelectrochemical water splitting," Renewable Energy, Elsevier, vol. 164(C), pages 156-170.
    3. Sharma, Dipika & Yadav, Jyoti & Mehta, B.R., 2021. "Reduced graphene oxide layer on nanostructured SnS thin films for improved visible light photoelectrochemical activity," Renewable Energy, Elsevier, vol. 169(C), pages 414-424.

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