Enhanced photoelectrochemical water splitting via engineered surface defects of BiPO4 nanorod photoanodes |
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| Authors: | Ayat N El-Shazly Mahmoud A Hamza Nageh K Allam |
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| Affiliation: | 1. Energy Materials Laboratory (EML), School of Sciences and Engineering, The American University in Cairo, New Cairo 11835, Egypt;2. Central Metallurgical Research and Development Institute, P.O. Box 87, Helwan, Cairo, Egypt;3. Chemistry Department, Faculty of Science, Ain-Shams University, Abbassia, Cairo, Egypt |
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| 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. |
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| Keywords: | Defect-engineering Photocatalysis Water splitting Hydrogen production |
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