Photocatalytic Hydrogen Peroxide Production by Antimony- and Potassium-Doped Polymeric Carbon Nitride}
Translated title
Photocatalytic Hydrogen Peroxide Production by Antimony- and Potassium-Doped Polymeric Carbon Nitride
Author
Term
4. Term
Education
Publication year
2025
Submitted on
2025-12-22
Pages
65
Abstract
This project seeks to investigate polymeric carbon nitride as a promosing photocatalyst for sustainable hydrogen peroxide production. In this work, PCN was systematically doped through single and co-doping with antimony and potassium to enhance its photocatalytic activity. Characterization techniques such as X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, UV–Vis spectroscopy, photoluminescence (PL), time-resolved photoluminescence, electron paramagnetic resonance, and electrochemical impedance spectroscopy, was used to evaluate the infleunce of dopant incorporation on the structure, optical, and electronic properties of polymeric carbon nitride. The results confirmed successful Sb and K incorporation, while still maintaining the framework of polymeric carbon nitride. Doping induced a redshift in the absorption edge and a reduction in bandgap energy, which resulted in enhanced visible-light absorption. PL and TRPL analyses revealed suppressed charge recombination and improved charge-carrier dynamics, while EPR measurements indicated enhanced photoinduced charge activity and oxygen activation. EIS demonstrated a reduction in charge-transfer resistance for doped sample, particularly for K-doped and Sb-K doped PCN at optimal dopant ratios. Photocatalytic experiment showed that Sb-doped PCN exhibit enhanced H2O2 generation compared to Pristine PCN with an optimal K and Sb loading of 1.25 mmol. Co-doping with potassium at low K concentration enhhanced the photocatalytic activity due to possible synergistic effects between electronic structure modulation and enhanced charge transport. Photocatalytic test with different pH conditions showed the acid and neutral environemnts favor H2O2 generation, whereas alkaline conditions suppress activity due to H2O2 instability.
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