Enhanced photoelectrochemical water splitting via engineered surface defects of BiPO4 nanorod photoanodes

Funding Sponsor

American University in Cairo

Author's Department

Physics Department

Third Author's Department

Physics Department

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https://doi.org/10.1016/j.ijhydene.2021.04.134

Document Type

Research Article

Publication Title

International Journal of Hydrogen Energy

Publication Date

7-1-2021

doi

10.1016/j.ijhydene.2021.04.134

Abstract

Herein, we report on the defect engineering of BiPO4 nanorods (NRs) via a facile room-temperature template-free co-precipitation method, followed by hydrogen treatment. The hydrogen treatment temperature determined the type of induced defects in the fabricated BiPO4 NRs and consequently their photocatalytic performance. Upon varying the annealing temperature, the x-ray diffraction (XRD) analysis showed phase transformation and x-ray photoelectron spectroscopy (XPS) analysis revealed variation in the oxygen vacancy content. At moderate treatment temperatures (200–300 °C), shallow defects were predominant, which extended the optical activity of the material to the visible region and increased the photocurrent 3 times when compared to that of bare BiPO4 NRs. However, treatment at higher temperatures completely altered the crystalline structure, destructed the morphology of the BiPO4 NRs, and severely affected the photoelectrochemical performance.

First Page

23214

Last Page

23224

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