Electrodeposited single-crystalline PbCrO<sub>4</sub> microrods for photoelectrochemical water oxidation: enhancement of minority carrier diffusion

Cho, Sung Ki; Akbar, Ramavi; Kang, Jinseok; Lee, Wonhee; Park, Hyun S.

doi:10.1039/c8ta02959h

Cited by 13 publications

(9 citation statements)

References 54 publications

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“…Also, PbCrO 4 has a smaller bandgap (∼2.3 eV) than that of BiVO 4 (∼2.5 eV). The measured PbCrO 4 bandgap matches those reported previously in the literature. ,, …”

Section: Resultssupporting

confidence: 89%

“…There have been a few previous papers on PbCrO 4 as a photoanode, but the photocurrent densities of PbCrO 4 reported in these studies were not close to those of BiVO 4 . , For example, at 1.23 V vs RHE, the best performance achieved by PbCrO 4 for sulfite oxidation is 0.5 mA/cm 2 , while that of BiVO 4 is ∼5 mA/cm 2 . ,, However, we note that the electron–hole separation yield or any other photoelectrochemical property of a polycrystalline photoelectrode varies significantly depending on the quality of the photoelectrode because impurities, unevenness in composition, poor electrical continuity, poor quality interface with the conducting substrate, and poor crystallinity considerably affect the electron–hole recombination and charge-transport properties. The morphology of the photoelectrode also plays a significant role in affecting its photoelectrochemical properties.…”

Section: Introductionmentioning

confidence: 66%

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Can a PbCrO₄ Photoanode Perform as Well as Isoelectronic BiVO₄?

Lindberg

Wang

Zhang

et al. 2020

ACS Appl. Energy Mater.

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Oxide-based photoelectrodes recently have been at the forefront of research for photoelectrochemical water splitting. While most oxide-based photoanodes suffer from severe electron−hole recombination, BiVO 4 photoanodes are known to achieve exceptionally high electron−hole separation efficiencies. However, an understanding of what features of BiVO 4 lead to this desired property is currently lacking. In this study, we sought to elucidate these features by investigating PbCrO 4 , which has electronic and structural similarities to BiVO 4 . For this goal, we prepared PbCrO 4 as a high-quality photoanode and compared its photoelectrochemical properties and stability with those of BiVO 4 . Our results showed that the electron−hole separation efficiency for PbCrO 4 at 1.23 V vs the reversible hydrogen electrode (RHE) was ∼67%, which is considerably higher than most oxide photoanodes and approaches that of state-of-the-art BiVO 4 . The photoelectrochemical similarities and differences between PbCrO 4 and BiVO 4 were discussed in detail, and the origins for their similarities and differences were investigated via combined experimental and computational studies, which include the computation of electronic band structures, band edge alignments, and the formation energies of oxygen vacancies of PbCrO 4 and BiVO 4 . The shared electronic and structural features of PbCrO 4 and BiVO 4 elucidated in this study provide useful guidelines to develop high-performance oxide-based photoanodes.

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“…Also, PbCrO 4 has a smaller bandgap (∼2.3 eV) than that of BiVO 4 (∼2.5 eV). The measured PbCrO 4 bandgap matches those reported previously in the literature. ,, …”

Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 66%

Can a PbCrO₄ Photoanode Perform as Well as Isoelectronic BiVO₄?

Lindberg

Wang

Zhang

et al. 2020

ACS Appl. Energy Mater.

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“…Lead chromate (PbCrO 4 ), a typical monoclinic phase semiconductor, has been attracted increasing attention in photocatalytic and photoelectrochemical water oxidation due to its visible-light harvesting properties (band gap ~2.1 eV). [15] However, the charge separation property of PbCrO 4 is poor, which greatly limits its efficiencies of solar energy conversion and further applications. In this work, using PbCrO 4 as an example, we conducted the morphology tailoring on PbCrO 4 from parallelepiped (p-PbCrO 4 ) to truncated decahedron (t-PbCrO 4 ) and elongated rhombic (r-PbCrO 4 ) crystals, resulting in the tunable morphology symmetry and the exposed anisotropic facets.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Anisotropic Facet of Lead Chromate Photocatalysts to Promote Spatial Charge Separation

Jiang

Ling-cong

et al. 2022

Angewandte Chemie

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A crucial issue in artificial photosynthesis is how to modulate the behaviors of photogenerated charges of semiconductor photocatalysts. Here, using lead chromate (PbCrO4) as an example, we conducted the morphology tailoring from parallelepiped (p‐PbCrO4) to truncated decahedron (t‐PbCrO4) and elongated rhombic (r‐PbCrO4), resulting in exposed anisotropic facets. The spatial separation of photogenerated charges closely correlates to the anisotropic facets of crystals, which can only be realized for t‐PbCrO4 and r‐PbCrO4. The charge‐separation efficiencies exhibit a quasilinear relation with the surface photovoltage difference between anisotropic facets. The r‐PbCrO4 gives an apparent quantum efficiency of 6.5 % at 500 nm for photocatalytic water oxidation using Fe3+ ions as electron acceptors. Moreover, the oxidation reverse reaction from Fe2+ to Fe3+ ions was completely blocked with ∼100 % of Fe3+ conversion achieved on the anisotropic PbCrO4 crystals.

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“…This material has recently received a great amount of attention from both fundamental and applied research. Its applications are many, going from optoelectronic 2 to photocatalytic water splitting 3,4 and degradation of pollutants under visible-light irradiation. 5,6 For optimizing them, it is necessary to accurately characterize the physical properties of PbCrO 4 .…”

mentioning

confidence: 99%

“…This material has recently received a great amount of attention from both fundamental and applied research. Its applications are many, going from optoelectronic to photocatalytic water splitting , and degradation of pollutants under visible-light irradiation. , For optimizing them, it is necessary to accurately characterize the physical properties of PbCrO 4 . This information is also relevant for understanding the manufacturing processes of objects of cultural and historical significance; like Kandinsky’s reverse paintings on glass .…”

mentioning

confidence: 99%

Putting the Squeeze on Lead Chromate Nanorods

Yuan

Rodríguez‐Hernández

Múñoz

et al. 2019

J. Phys. Chem. Lett.

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We have studied by means of X-ray diffraction and Raman spectroscopy the high-pressure behavior of PbCrO 4 nanorods. We have found that these nanorods follow a distinctive structural sequence that differs from that of bulk PbCrO 4 . In particular, a phase transition from a monoclinic monazite-type PbCrO 4 to a novel monoclinic AgMnO 4 -type polymorph has been discovered at 8.5 GPa. The crystal structure, Raman-active phonons, and compressibility of this novel high-pressure phase are reported for the first time. The experimental findings are supported by ab initio calculations that provide information not only on structural and vibrational properties of AgMnO 4 -type PbCrO 4 but also on the electronic properties. The discovered phase transition triggers a band gap collapse and a subsequent metallization at 44.2 GPa, which has not been observed in bulk PbCrO 4 . This suggests that nanoengineering can be a useful strategy to drive metallization under compression.

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Electrodeposited single-crystalline PbCrO₄ microrods for photoelectrochemical water oxidation: enhancement of minority carrier diffusion

Abstract: Electrodeposited single-crystalline PbCrO4 microrods are highly active toward photoelectrochemical water oxidation.

Cited by 13 publications

References 54 publications

Can a PbCrO₄ Photoanode Perform as Well as Isoelectronic BiVO₄?

Can a PbCrO₄ Photoanode Perform as Well as Isoelectronic BiVO₄?

Tuning the Anisotropic Facet of Lead Chromate Photocatalysts to Promote Spatial Charge Separation

Putting the Squeeze on Lead Chromate Nanorods

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Electrodeposited single-crystalline PbCrO4 microrods for photoelectrochemical water oxidation: enhancement of minority carrier diffusion

Abstract: Electrodeposited single-crystalline PbCrO4 microrods are highly active toward photoelectrochemical water oxidation.

Cited by 13 publications

References 54 publications

Can a PbCrO4 Photoanode Perform as Well as Isoelectronic BiVO4?

Can a PbCrO4 Photoanode Perform as Well as Isoelectronic BiVO4?

Tuning the Anisotropic Facet of Lead Chromate Photocatalysts to Promote Spatial Charge Separation

Putting the Squeeze on Lead Chromate Nanorods

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Product

Resources

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Electrodeposited single-crystalline PbCrO₄ microrods for photoelectrochemical water oxidation: enhancement of minority carrier diffusion

Can a PbCrO₄ Photoanode Perform as Well as Isoelectronic BiVO₄?

Can a PbCrO₄ Photoanode Perform as Well as Isoelectronic BiVO₄?