Journal
SOLAR ENERGY
Volume 227, Issue -, Pages 426-437Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2021.09.028
Keywords
Bi@g-C3N4; Photoelectrocatalytic oxygen evolution; LaCoO3; Cocatalyst
Categories
Funding
- Iranian National Science Foundation (INSF) [98009439]
- Ferdowsi University of Mashhad
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A novel photoanode was designed for efficient photoelectrocatalytic water splitting by electrophoretic loading of porous perovskite-lanthanum cobaltite (LaCoO3) on bismuth doped g-C3N4 (Bi@g-C3N4). The addition of Bi and LaCoO3 significantly enhanced the photoconversion efficiency, improved electron transfer, and reduced electrochemical impedance, leading to higher photocurrent density and better performance compared to pristine g-C3N4 and Bi@g-C3N4 alone.
The electrophoretic loading of porous perovskite-lanthanum cobaltite (LaCoO3) on bismuth doped g-C3N4 (Bi@g-C3N4) as a novel photoanode was designed for the efficient photoelectrocatalytic water splitting. Before loading cocatalyst, the photoelectrocatalytic oxygen evolution of g-C3N4 was investigated with various amounts of Bi. The photoconversion efficiency enhanced more than 3.7 times for 3.6% Bi doped compared with that of the pristine g-C3N4. The Mott-Schottky plots showed the amount of band bending for Bi@g-C3N4 is more than that of g-C3N4 resulting in better electron transfer at the photoelectrode/electrolyte interface. By loading LaCoO3 on Bi@g-C3N4 photoanode, the photoconversion efficiency of 2.3% at 0.28 V (vs. RHE) was obtained under visible light which is more than that of Bi@g-C3N4 (0.92% at 0.48 V vs. RHE) alone. The high photocurrent density of 0.40 mA cm(-2) was observed for Bi@g-C3N4/LaCoO3 photoanode as compared with Bi@g-C3N4 (0.17 mA cm(-2)) at the redox potential of O-2/H2O. Also, Bi@g-C3N4/LaCoO3 photoanode represents a smaller arc radius in electrochemical impedance spectroscopy Nyquist plot compared with those of g-C3N4 and Bi@g-C3N4.
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