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Applied Surface Science

Applied Surface Science

IF: 6.29
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Synergistic mechanism of facet junction and pn junction optimizing charge transfer for enhanced photocatalytic hydrogen production in the CuCo2O4/Cd0. 5Zn0. 5S?…

Published:6 December 2024 DOI: 10.1016/j.apsusc.2024.162043
Mei Dong, Wenjun Li, Liang Geng, Ruixue Huang, Yuan Liu, Hongli Han

Abstract

Herein, CuCo2O4 hollow porous nanospheres (HPN), nanosheets (NS), and nanowires (NW) were synthesized via solvothermal and calcination processes, and were used to construct efficient heterojunctions with Cd0.5Zn0.5S. Interestingly, the unique hollow porous structure exhibits enhanced light absorption, large pore diameter (12.57?nm), and strong hydrophilicity (10.05°). Photocatalytic results indicate that CuCo2O4 HPN/Cd0.5Zn0.5S achieves the optimal hydrogen production rate, which is 5.4, 1.2, and 1.3 times than that of pure Cd0.5Zn0.5S, CuCo2O4 NW/Cd0.5Zn0.5S and CuCo2O4 NS/Cd0.5Zn0.5S, respectively. High-resolution TEM and theoretical calculations confirm that (311)/(111) facet junctions in CuCo2O4 nanospheres form a work function difference (0.24?eV), which significantly facilitates charge transfer and separation. Mott-Schottky and Ultraviolet photoelectron spectroscopy analyses indicate that p-type CuCo2O4 and n-type Cd0.5Zn0.5S have staggered energy levels and a distinct Fermi level difference (1.85?eV), which leads to rearrangement of the Fermi energy level and modulation of charge transfer pathway. The resulting energy band bending and built-in electric field promote charge transfer at the heterojunction interface more effectively. The synergistic mechanism of the facet junction and p-n junction finally achieves high-efficiency hydrogen production. This work provides new insights into how to construct efficient p-n heterojunction photocatalysts and presents the synergistic mechanism of facet junction and p-n junction.

Substances (9)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Isopropyl alcohol 67-63-0 C3H8O 1647 suppliers $7050.00
Ethylene glycol 107-21-1 C2H6O2 1399 suppliers $10.00-$908.54
Ethanol 64-17-5 C2H6O 806 suppliers $10.00-$17310.00
Urea 57-13-6 CH4N2O 777 suppliers $5.00-$9263.00
Barium sulfate 7727-43-7 BaO4S 497 suppliers $26.20-$6713.01
Zinc acetate dihydrate 5970-45-6 C4H10O6Zn 388 suppliers $13.50-$35640.00
Cobaltous nitrate hexahydrate 10026-22-9 CoH12N2O12 337 suppliers $17.47-$1060.00
Sodium sulfide nonahydrate 1313-84-4 H2Na2OS 302 suppliers $17.47-$4302.45
Cupric nitrate trihydrate 10031-43-3 CuH3NO4 230 suppliers $10.00-$4070.00

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