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Piezo-photocatalysis coupling in BiFeO3–CeO2 heterojunction with off-site dual-active centers for ultrafast heterogeneous Fenton-like reactions.

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Title: Piezo-photocatalysis coupling in BiFeO3–CeO2 heterojunction with off-site dual-active centers for ultrafast heterogeneous Fenton-like reactions.
Authors: Lin, Jierui1 (AUTHOR), Zheng, Yan1 (AUTHOR), Li, Zemin1 (AUTHOR), Tu, Shuchen1 (AUTHOR) shuchentu@m.scnu.edu.cn, Yan, Bo1 (AUTHOR)
Source: Applied Surface Science. Jul2026, Vol. 733, pN.PAG-N.PAG. 1p.
Subjects: Charge transfer, Heterogeneous catalysts, Catalytic domains, Haber-Weiss reaction, Catalysis, Organic compounds removal (Water purification), Hydroxyl group
Abstract: [Display omitted] • An off-site Ce-Fe dual-active center is constructed via a BiFeO 3 –CeO 2 heterojunction. • Piezo-photocatalysis synergy creates a "charge generation-transport" highway for catalysis. • Ultrafast pollutant degradation (>90% in 3 min) with high •OH yield (387.84 μmol g−1 h−1) is achieved. • The piezoelectric potential dynamically steers interfacial charge transfer via band bending. Efficient interfacial charge transfer is crucial for enhancing the kinetics of heterogeneous Fenton-like reactions. This study presents a dynamic modulation strategy for the off-site Ce-Fe dual-active centers (spatially separated Ce and Fe sites across the heterojunction interface) in BiFeO 3 –CeO 2 heterojunction via the piezo-photocatalysis, which facilitates the ultrafast hydrogen peroxide (H 2 O 2) activation. Under the synergistic piezo-photocatalytic condition, this system achieved over 90% degradation of sodium butyl xanthate (10 mg/L) within 3 min, with an apparent kinetic constant (0.43 min−1) three times higher than that of the Fenton-like process alone. Simultaneously, a remarkable hydroxyl radical (•OH) yield of 387.84μmol g−1 h−1 was attained, representing a 10-fold enhancement over the conventional system. In-situ piezoresponse force microscopy and electrochemical analyses reveal that the piezoelectric polarization couples with the built-in electric field, creating a potent directional field at the interface that drives the efficient charge migration. This process not only promotes H 2 O 2 reduction on the CeO 2 surface but also establishes a rapid valence cycle between Ce3+/Ce4+ and Fe2+/Fe3+. This work elucidates the mechanism of external-field-mediated electronic structure regulation at the heterojunction interface at the atomic/molecular level, providing a novel approach for designing high-performance catalytic systems through surface and interface engineering. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:[Display omitted] • An off-site Ce-Fe dual-active center is constructed via a BiFeO 3 –CeO 2 heterojunction. • Piezo-photocatalysis synergy creates a "charge generation-transport" highway for catalysis. • Ultrafast pollutant degradation (>90% in 3 min) with high •OH yield (387.84 μmol g−1 h−1) is achieved. • The piezoelectric potential dynamically steers interfacial charge transfer via band bending. Efficient interfacial charge transfer is crucial for enhancing the kinetics of heterogeneous Fenton-like reactions. This study presents a dynamic modulation strategy for the off-site Ce-Fe dual-active centers (spatially separated Ce and Fe sites across the heterojunction interface) in BiFeO 3 –CeO 2 heterojunction via the piezo-photocatalysis, which facilitates the ultrafast hydrogen peroxide (H 2 O 2) activation. Under the synergistic piezo-photocatalytic condition, this system achieved over 90% degradation of sodium butyl xanthate (10 mg/L) within 3 min, with an apparent kinetic constant (0.43 min−1) three times higher than that of the Fenton-like process alone. Simultaneously, a remarkable hydroxyl radical (•OH) yield of 387.84μmol g−1 h−1 was attained, representing a 10-fold enhancement over the conventional system. In-situ piezoresponse force microscopy and electrochemical analyses reveal that the piezoelectric polarization couples with the built-in electric field, creating a potent directional field at the interface that drives the efficient charge migration. This process not only promotes H 2 O 2 reduction on the CeO 2 surface but also establishes a rapid valence cycle between Ce3+/Ce4+ and Fe2+/Fe3+. This work elucidates the mechanism of external-field-mediated electronic structure regulation at the heterojunction interface at the atomic/molecular level, providing a novel approach for designing high-performance catalytic systems through surface and interface engineering. [ABSTRACT FROM AUTHOR]
ISSN:01694332
DOI:10.1016/j.apsusc.2026.166612