Journal
APPLIED SURFACE SCIENCE
Volume 623, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2023.157066
Keywords
N-rich doped TiO2; Copper phthalocyanine modification; S-scheme charge transfer; Visible-light photocatalysis; CO2 conversion
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Inspired by natural photosynthesis, the rational design of efficient S-scheme heterojunctions holds promises for CO2 conversion by utilizing solar light. Nitrogen-rich doped 001-exposed anatase nanosheets (NPT) were designed and fabricated, and then controllably coupled with copper phthalocyanine (CuPc) to construct a wide-visible-light responsive heterojunction for efficient CO2 conversion. The optimized CuPc/NPT heterojunction achieves a high production rate of CO under visible light irradiation, with a 9-fold enhancement compared with generally N-doped TiO2.
Inspired by natural photosynthesis, the rational design of efficient S-scheme heterojunctions holds promises for CO2 conversion by utilizing solar light. Herein, nitrogen-rich doped 001-exposed anatase nanosheets (NPT) have been designed and fabricated by post-treatment with NH3 at a high temperature of 600 degrees C to phosphate modified TiO2 firstly, and then controllably coupled with copper phthalocyanine (CuPc) via a hydroxyl-induced assembly process to construct a wide-visible-light responsive heterojunction towards CO2 conversion. The optimized CuPc/ NPT heterojunction achieves a high production rate of CO (similar to 5 mu mol/g/h) under visible light irradiation, with similar to 9-fold enhancement compared with generally N-doped TiO2. Based on the experimental results mainly from photocurrent action spectra, electron paramagnetic resonance measurements, electrochemical reduction curves and in-situ diffuse reflectance infrared Fourier transform spectra, it is confirmed that the exceptional photo-activity is attributed to the N-rich doping for increasing visible-light absorption of TiO2, the effective S-scheme charge transfer from the closely-contacted CuPc/NPT heterojunction with wide visible-light absorption, and subsequently to the electron transfer from the Pc ligand to central metal Cu2+ with good catalytic function for CO2 reduction. This work provides feasible routes for the design and preparation of TiO2-based photocatalysts for solar-driven CO2 conversion.
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