Facile Zn and Ni Co-doped hematite nanorods for efficient photocatalytic water oxidation

dc.contributor.authorTalibawo, Joan
dc.contributor.authorKyesmen, Pannan Isa
dc.contributor.authorCyulinyana, Marie C.
dc.contributor.authorDiale, M. (Mmantsae Moche)
dc.contributor.emailmmantsae.diale@up.ac.zaen_US
dc.date.accessioned2023-09-26T13:16:42Z
dc.date.available2023-09-26T13:16:42Z
dc.date.issued2022-08-27
dc.descriptionDATA AVAILABILITY STATEMENT : The data generated and or analyzed in this work can be obtained from the corresponding author upon reasonable request.en_US
dc.description.abstractIn this work, we report the effect of zinc (Zn) and nickel (Ni) co-doping of hydrothermally synthesized hematite nanorods prepared on fluorine-doped tin oxide (FTO) substrates for enhanced photoelectrochemical (PEC) water splitting. Seeded hematite nanorods (NRs) were facilely doped with a fixed concentration of 3 mM Zn and varied concentrations of 0, 3, 5, 7, and 9 mM Ni. The samples were observed to have a largely uniform morphology of vertically aligned NRs with slight inclinations. The samples showed high photon absorption within the visible spectrum due to their bandgaps, which ranged between 1.9–2.2 eV. The highest photocurrent density of 0.072 mA/cm2 at 1.5 V vs. a reversible hydrogen electrode (RHE) was realized for the 3 mM Zn/7 mM Ni NRs sample. This photocurrent was 279% higher compared to the value observed for pristine hematite NRs. The Mott–Schottky results reveal an increase in donor density values with increasing Ni dopant concentration. The 3 mM Zn/7 mM Ni NRs sample produced the highest donor concentration of 2.89 1019 (cm3), which was 2.1 times higher than that of pristine hematite. This work demonstrates the role of Zn and Ni co-dopants in enhancing the photocatalytic water oxidation of hematite nanorods for the generation of hydrogen.en_US
dc.description.departmentPhysicsen_US
dc.description.librarianam2023en_US
dc.description.sponsorshipThe African Centre of Excellence in Energy and Sustainable Development at the University of Rwanda, Department of Physics—University of Pretoria, The National Research Foundation, the Organization for Women in Science for the Developing World (OWSD), and Swedish International Development Cooperation Agency (SIDA).en_US
dc.description.urihttps://www.mdpi.com/journal/nanomaterialsen_US
dc.identifier.citationTalibawo, J.; Kyesmen, P.I.; Cyulinyana, M.C.; Diale, M. Facile Zn and Ni Co-Doped Hematite Nanorods for Efficient Photocatalytic Water Oxidation. Nanomaterials 2022, 12, 2961. https://DOI.org/10.3390/nano12172961.en_US
dc.identifier.issn2079-4991
dc.identifier.other10.3390/nano12172961
dc.identifier.urihttp://hdl.handle.net/2263/92417
dc.language.isoenen_US
dc.publisherMDPIen_US
dc.rights© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.en_US
dc.subjectHematite nanorodsen_US
dc.subjectZinc/nickel co-dopingen_US
dc.subjectPhotocurrenten_US
dc.subjectFluorine-doped tin oxide (FTO)en_US
dc.subjectPhotoelectrochemical (PEC)en_US
dc.subjectWater splittingen_US
dc.subjectPEC water oxidationen_US
dc.subjectSDG-06: Clean water and sanitationen_US
dc.titleFacile Zn and Ni Co-doped hematite nanorods for efficient photocatalytic water oxidationen_US
dc.typeArticleen_US

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