研究目的
Investigating the performance of TiO2 for PEC water splitting with the addition of oxalic acid as a sacrificial donor.
研究成果
The addition of oxalic acid as a sacrificial donor significantly enhances the photocurrent in PEC water splitting, with the highest photocurrent observed in water electrolyte without Na2SO4. This suggests oxalic acid's strong reductive properties and its potential as an efficient electron donor in PEC systems.
研究不足
The study is limited by the use of TiO2 with a wide band gap, which restricts light absorption to UV range, and the potential for electron-hole pair recombination affecting efficiency.
1：Experimental Design and Method Selection:
The study involved the fabrication of TiO2 thin films on FTO glass using a doctor blade technique and sintering at 450°C. The films were characterized for morphology, particle size, and crystallinity using SEM, XRD, and UV-Vis spectrophotometry. PEC testing was conducted to measure photoelectroactivity with and without oxalic acid in different electrolytes.
2：Sample Selection and Data Sources:
TiO2 (P25 Degussa) was used as the photocatalyst, with oxalic acid as the sacrificial donor. Electrolytes included distilled water and Na2SO4 aqueous solution.
3：List of Experimental Equipment and Materials:
SEM (Zeiss AM10), XRD (Bruker XRD D8 Advance diffractometer), UV-Vis spectrophotometer (PerkinElmer Lambda 35), Ametek Versastat 4 with a Xenon full arc lamp.
4：Experimental Procedures and Operational Workflow:
TiO2 paste was prepared and coated on FTO glass, followed by sintering. The films were then characterized and subjected to PEC testing under varying conditions.
5：Data Analysis Methods:
The photocurrent density was measured under different electrolyte conditions to assess the effect of oxalic acid as a sacrificial donor.
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SEM
Zeiss AM10
Zeiss
Morphology and particle size analysis
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XRD
Bruker XRD D8 Advance diffractometer
Bruker
Crystalline phase determination
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UV-Vis spectrophotometer
PerkinElmer Lambda 35
PerkinElmer
Light absorption measurement
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Ametek Versastat 4
Versastat 4
Ametek
Photoelectrochemical analysis
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TiO2
P25 Degussa
Degussa
Photocatalyst for PEC water splitting
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Fluorine-doped Tin oxide coated conductive glass
FTO Asahi Co
Asahi Co
Substrate for TiO2 thin films
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