Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
TiO2 is regarded to be quite stable during photoelectrochemical (PEC) water-splitting reaction as its redox potential has been reported to be more positive/negative relative to the water oxidation/reduction potential according to the calculation.[1] The photogenerated charge carriers would be more likely to participate in driving the desired water-splitting reaction instead of oxidizing or reducing semiconductor photoelectrode. However, it is also found that there is a performance degradation of TiO2 under UV light irradiation during PEC water-splitting process.[2]
Characterizations including transmission electron microscopy (TEM), scanning electron microscopy (SEM), X‐ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS) together with operando inductively coupled plasma mass spectrometry (ICP-MS) coupled with illuminated scanning flow cell were applied to investigate photoelectrochemical (PEC) corrosion pathways of TiO2 photoelectrode. TiO2 nanorod was used as our representative system to conduct the mechanism study. PEC measurements were performed on a Reference600 potentiostat (Gamry) with a three-electrode PEC cell. We successfully prepared TiO2 tetragonal rutile phase. The prepared TiO2 shows nanotube morphology with a length of 2.1 µm and an average diameter of 200 ± 20 nm and grows along with the direction [001]. Through the SFC method, the operation parameters of PEC on photoelectrodes can be controlled to elucidate thoroughly the relationship between corrosion and performance in the electrolyte during the whole PEC process. The technique plays an important role in providing significant guidance in the (photo)electrochemistry field and is recommended in future research.
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