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Magnetic field-enhanced photoelectrochemical water splitting of Co3O4/TiO2 for efficient oxygen evolution

Effective separation of photogenerated carriers plays a vital role in governing the efficiency of photo-electrocatalytic reactions. However, the advancement in enhancing the intrinsic carrier separation efficiency of semiconductors has shown limited progress. Herein, we reported the use of a magneti...

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Published in:Science China materials 2024-10, Vol.67 (10), p.3167-3175
Main Authors: Zhou, Ze-En, Lu, Yi, Liu, Yi-Xuan, Cao, Shang, Tian, Ge, Hu, Zhi-Yi, Shen, Ling, Wu, Si-Ming, Ying, Jie, Geng, Wei, Yang, Xiao-Yu
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container_issue 10
container_start_page 3167
container_title Science China materials
container_volume 67
creator Zhou, Ze-En
Lu, Yi
Liu, Yi-Xuan
Cao, Shang
Tian, Ge
Hu, Zhi-Yi
Shen, Ling
Wu, Si-Ming
Ying, Jie
Geng, Wei
Yang, Xiao-Yu
description Effective separation of photogenerated carriers plays a vital role in governing the efficiency of photo-electrocatalytic reactions. However, the advancement in enhancing the intrinsic carrier separation efficiency of semiconductors has shown limited progress. Herein, we reported the use of a magnetic field to improve the photoelectrochemical water splitting of a magnetic Co 3 O 4 /TiO 2 photoanode by boosting the photogenerated carrier separation efficiency. In the presence of the magnetic field, oxygen evolution reaction occurs with a high photocurrent density of 0.86 mA cm −2 at 1.23 V versus V RHE , and an applied bias photon-to-current efficiency of 0.342% at 0.61 V RHE . Moreover, the photoanode maintains its oxygen evolution reaction for more than 400 h with photocurrent decays by ca. 10%. Observations made in this effort show that the enhancement of photo-electrocatalytic efficiency by a magnetic field is a consequence of the effect of the Lorentz force generated by the magnetic field on photogenerated carriers and ions near the Co 3 O 4 /TiO 2 photoanode, which improves the carrier separation efficiency and the bubble release rate. The results suggest that manipulating photoelectrode carriers by using a magnetic field is a promising strategy to design high-performance photoelectrochemical for water splitting.
doi_str_mv 10.1007/s40843-024-3029-5
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title Magnetic field-enhanced photoelectrochemical water splitting of Co3O4/TiO2 for efficient oxygen evolution
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