Water-splitting properties of bi-phased TiO2 nanotube arrays subjected to high-temperature annealing
Source abstract
Abstract
Abstract An extended study was conducted to correlate between morphological, crystalline phase conversion and the photoelectrochemical water-splitting properties of anodic TiO2 nanotube arrays (TNTs) films annealed at elevated temperatures, starting from 450 °C to 850 °C. A distinct visualization was provided to support the effect of the high temperature annealing up to 850 °C on the photocurrent productivity of the TNTs films, which acted as photoanodes based on the crystalline anatase-rutile composition ratio. To assess the photoelectrochemical productivity for different annealed materials, several electrochemical techniques were utilized namely; electrochemical impedance spectroscopy (EIS), chronoamperometry and potentiodynamic polarization (PP). Results indicated that the crystalline bi-phased (anatase/rutile) TiO2 nanotube arrays synergistically influenced the photoelectrochemical water splitting. It was found that the annealed TNTs film with bi-phase content composition (66% anatase and 34% rutile) at 650 °C exhibited maximum photoelectrochemical water-splitting properties with a significant applied bias photon-to-current conversion efficiency (ABPE%) of 0.41%. These results describe a promising target for the fabrication of high performance bi-phase crystalline (anatase and rutile) nanoporous TNTs for improving the photoelectrochemical water-splitting efficiency. Incident photon-to-electron conversion efficiency measurements (IPCE%) also showed the superiority of annealed sample at 650 °C (43.4%), which agrees with EIS, PP and ABPE% calculations.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: TiO2 Photocatalysis and Solar Cells · Advanced Photocatalysis Techniques · Transition Metal Oxide Nanomaterials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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