Formation and transition of the phases in the Pb–Cr–O system

Gu, Lijun; Cao, Liang; Meng, Guangyao

doi:10.1016/j.jallcom.2008.06.142

Cited by 2 publications

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“…Among them, the first three oxides with Pb(PbO) n CrO 4 ( n = 0, 1, 4) composition were known to have an optoelectronic property. PbCrO 4 is a well-known yellow pigment with a monoclinic P 2 1 / n structure, , and possible application of PbCrO 4 as an optoelectronic material was reported. , The photoactivity of PbCrO 4 was also reported with insignificant activity for water splitting. − Pb 2 CrO 5 is known as chromium orange with monoclinic structure in space group c 2/ m . , It was studied as a photoconductive dielectric material with high absorption coefficients in the visible and ultraviolet light spectrum in which its conductivity changes rapidly under the light irradiation. − Its use as a photovoltaic material was also reported in which 1.16 V of photovoltage was observed with an irradiated light intensity of 23.35 mW/cm 2 . − Pb 5 CrO 8 has a monoclinic P 2 1 / c space group symmetry, and it is a less researched material except for a study of optoelectronic properties as a line-image sensor …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Visible Light Photoelectrochemical Properties of PbCrO₄, Pb₂CrO₅, and Pb₅CrO₈

et al. 2017

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Photoactivities of lead chromates with various combinations of Pb and Cr are rapidly screened using scanning electrochemical microscopy (SECM). In the rapid screening investigation, the metal oxide spot electrode with a Pb/Cr ratio of 2:1 exhibits the highest photoactivity among the semiconductor prepared with different compositions. The photoactivity and electrochemical properties of thin-film electrodes of PbCrO 4 , Pb 2 CrO 5 , and Pb 5 CrO 8 are further studied following the combinatorial screening. In the bulk electrode measurements, the Pb 2 CrO 5 bulk electrode displays the highest photocurrent of 0.23 mA/cm 2 for SO 3 2− oxidation at 0.4 V vs Ag/AgCl under 100 mW/cm 2 UV−vis light irradiation. Pb 2 CrO 5 presents visible light activity with an absorption wavelength up to 550 nm and an incident photon to current conversion efficiency (IPCE) of 10% at the wavelength of 340 nm. The onset wavelength observed in the UV−vis absorption spectrum increases with increasing Pb contents in lead chromates. Optically obtained direct band gaps decreased from 2.38 to 2.25 to 2.07 eV for PbCrO 4 , Pb 2 CrO 5 , and Pb 5 CrO 8 , respectively. However, the onset wavelength that appeared in IPCE is 2.26 ± 0.02 eV for all three lead chromates where the photocurrent under longer wavelength light irradiation is insignificant. The results imply that more Pb 6s orbitals form interband states, increasing optical transitions in lead chromates. The band structures of PbCrO 4 , Pb 2 CrO 5 , and Pb 5 CrO 8 are also determined by electrochemical analyses and ultraviolet photoelectron spectroscopy (UPS).

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