Enhanced photoelectrochemical water splitting and mitigation of organic pollutants under visible light with NaNbO3@CuS Core-Shell heterostructures

Sandeep Kumar, Ashok K. Ganguli

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We have synthesized new NaNbO3@CuS core-shell heterostructures by an ion-exchange based hydrothermal method. The powder X-ray diffraction (PXRD) analysis revealed the orthorhombic and hexagonal phase of NaNbO3 and CuS, respectively. The photocatalytic efficiency using these heterostructures is a manifestation of high surface area, appropriate band alignment and increased range of light harvesting. The core-shell materials show significant photocatalytic activity towards photoelectrochemical water splitting and degradation of Rhodamine B (RhB) organic dye considered as a model pollutant for study under visible light illumination. The photoelectrochemical (PEC) measurements using these core-shell heterostructure as photocathodes, characterized by high photocurrent density of ∼ 4.87 mA/cm2 at ̶0.648 onset potential versus Ag/AgCl. Mott-Schottky analysis indicates the p-n junction feature of NaNbO3@CuS core-shell heterostructures which facilitate the interfacial separation of photogenerated charge carriers. Furthermore, the longer life time of charge carriers of the core-shell heterostructures (20 twenty times larger τave as compared to bare CuS) revealed the higher photocatalytic efficiency.

Original languageEnglish
Article number100239
JournalApplied Surface Science Advances
Volume9
DOIs
StatePublished - Jun 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022

Funding

The authors thank the Department of Science and Technology (DST), Government of India, for financial support.

FundersFunder number
Department of Science and Technology, Ministry of Science and Technology, India

    Keywords

    • Heterostructure
    • Interfacial charge transfer
    • NaNbO@CuS core-shell
    • Photocatalysis
    • Photoelectrochemical studies

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