Efficient Separation of Photoexcited Charge at Interface between Pure CeO2 and Y3+-Doped CeO2 with Heterogonous Doping Structure for Photocatalytic Overall Water Splitting

Honghao, Hou; Yamada, Hirohisa; Nitta, Atsumi; Murakami, Yoshinori; Saito, Nobuo

doi:10.3390/ma14020350

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…Among these, in recent years cerium oxide (CeO 2 , ceria) has emerged as an interesting alternative to TiO 2 or ZnO due to its redox properties, suitable band position for the photocatalytic H 2 evolution and the lower bandgap (2.7–2.9 eV) with respect to ZnO and TiO 2 [ 7 , 8 , 9 , 10 ]. To enhance the H 2 production with the CeO 2 -based materials, chemical and/or structural modifications are necessary.…”

Section: Introductionmentioning

confidence: 99%

CeO2-rGO Composites for Photocatalytic H2 Evolution by Glycerol Photoreforming

et al. 2023

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The interaction between CeO2-GO or CeO2-rGO and gold as co-catalysts were here investigated for solar H2 production by photoreforming of glycerol. The materials were prepared by a solar photoreduction/deposition method, where in addition to the activation of CeO2 the excited electrons were able to reduce the gold precursor to metallic gold and the GO into rGO. The presence of gold was fundamental to boost the H2 production, whereas the GO or the rGO extended the visible-light activity of cerium oxide (as confirmed by UV-DRS). Furthermore, the strong interaction between CeO2 and Au (verified by XPS and TEM) led to good stability of the CeO2-rGO-Au sample with the evolved H2 that increased during five consecutive runs of glycerol photoreforming. This catalytic behaviour was ascribed to the progressive reduction of GO into rGO, as shown by Raman measurements of the photocatalytic runs. The good charge carrier separation obtained with the CeO2-rGO-Au system allowed the simultaneous production of H2 and reduction of GO in the course of the photoreforming reaction. These peculiar features exhibited by these unconventional photocatalysts are promising to propose new solar-light-driven photocatalysts for green hydrogen production.

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Section: Introductionmentioning

confidence: 99%

CeO2-rGO Composites for Photocatalytic H2 Evolution by Glycerol Photoreforming

et al. 2023

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Synthesis and Oxygen Storage Capacities of Yttrium-Doped CeO2 with a Cubic Fluorite Structure

Gao

Ding

2022

Materials

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Doping CeO2 with Y cations was achieved in this study using three strategies: doping only during the hydrothermal process (H-Y-doped CeO2), doping only during the impregnation process (I-Y-doped CeO2), and doping during both the hydrothermal and impregnation processes (H/I-Y-doped CeO2). During the three synthesis strategies of Y-doped CeO2, these Y ions could be incorporated into the CeO2 lattice in the +3 state while holding the cubic fluorite structure, and no impurity phases were detected. Pure CeO2 crystal itself contained a certain number of intrinsic VO defects, and Y-doping was beneficial for the creation of extrinsic VO defects. The relative concentrations of VO defects were quantified by the values of A592/A464 obtained from Raman spectra, which were 1.47, 0.93, and 1.16 for the H-Y-, I-Y-, and H/I-Y-doped CeO2, respectively, and were higher than that of the undoped one (0.67). Moreover, the OSCs of the three Y-doped CeO2 were enhanced, and the sequence of OSCs was: H-Y-doped CeO2 (0.372 mmol/g) > H/I-Y-doped CeO2 (0.353 mmol/g) > I-Y-doped CeO2 (0.248 mmol/g) > Undoped CeO2 (0.153 mmol/g); this result was in good agreement with the Raman spectroscopy results.

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Efficient Separation of Photoexcited Charge at Interface between Pure CeO2 and Y3+-Doped CeO2 with Heterogonous Doping Structure for Photocatalytic Overall Water Splitting

Cited by 2 publications

References 33 publications

CeO2-rGO Composites for Photocatalytic H2 Evolution by Glycerol Photoreforming

CeO2-rGO Composites for Photocatalytic H2 Evolution by Glycerol Photoreforming

Synthesis and Oxygen Storage Capacities of Yttrium-Doped CeO2 with a Cubic Fluorite Structure

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