研究目的
To address the severe bulk recombination of photongenerated carriers, the sluggish oxygen evolution reaction (OER) kinetics and the poor visible light response in TiO2 photoanodes for PEC water splitting.
研究成果
The CQDs/A/R-TiO2 photoanode demonstrated significantly enhanced PEC performance due to the suppression of bulk recombination of photogenerated carriers, improved OER kinetics, and enhanced light harvesting. The photocurrent was increased by 11.72 times and the onset potential was negatively shifted by 240 mV compared to pristine TiO2.
研究不足
The study focuses on the modification of TiO2 photoanodes with CQDs and the formation of A/R-TiO2 heterojunctions, but does not explore the long-term stability under operational conditions or the scalability of the synthesis process.
1：Experimental Design and Method Selection:
The study involved the design of a CQDs modified anatase/rutile TiO2 photoanode through the growth of anatase TiO2 nanothorns on rutile TiO2 nanorods followed by surface modification with CQDs.
2：Sample Selection and Data Sources:
The samples included pristine TiO2, A/R-TiO2, CQDs/TiO2, and CQDs/A/R-TiO2 photoanodes.
3：List of Experimental Equipment and Materials:
Equipment used included transmission electronic microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electrochemical impedance spectroscopy (EIS). Materials included TiO2 nanorods, anatase TiO2 nanothorns, and CQDs.
4：Experimental Procedures and Operational Workflow:
The process involved the synthesis of TiO2 nanorods, growth of anatase TiO2 nanothorns, and surface modification with CQDs. PEC performance was evaluated through linear sweep voltammetry (LSV), transient photocurrent responses, and chronoamperometric current measurements.
5：Data Analysis Methods:
Data analysis included calculation of bulk charge separation efficiency (ηbulk) and surface charge injection efficiency (ηsurface), and interpretation of EIS Nyquist plots.
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