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Bi(1-x)La(x)CuSeO as New Tunable Full Solar Light Active Photocatalysts.

Wang H, Li S, Liu Y, Ding J, Lin YH, Xu H, Xu B, Nan CW - Sci Rep (2016)

Bottom Line: However, efficiently harvesting solar energy for photocatalysis remains a pressing challenge, and the charge kinetics and mechanism of the photocatalytic process is far from being well understood.Our measurements and density-functional-theory calculations reveal that the effective mass and mobility of the carriers in BiCuSeO can be tuned by the La-doping, which are responsible for the tunable photocatalytic activity.Our findings may offer new perspectives for understanding the mechanism of photocatalysis through modulating the charge mobility and the effective mass of carriers and provide a guidance for designing efficient photocatalyts.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China.

ABSTRACT
Photocatalysis is attracting enormous interest driven by the great promise of addressing current energy and environmental crises by converting solar light directly into chemical energy. However, efficiently harvesting solar energy for photocatalysis remains a pressing challenge, and the charge kinetics and mechanism of the photocatalytic process is far from being well understood. Here we report a new full solar spectrum driven photocatalyst in the system of a layered oxyselenide BiCuSeO with good photocatalytic activity for degradation of organic pollutants and chemical stability under light irradiation, and the photocatalytic performance of BiCuSeO can be further improved by band gap engineering with introduction of La. Our measurements and density-functional-theory calculations reveal that the effective mass and mobility of the carriers in BiCuSeO can be tuned by the La-doping, which are responsible for the tunable photocatalytic activity. Our findings may offer new perspectives for understanding the mechanism of photocatalysis through modulating the charge mobility and the effective mass of carriers and provide a guidance for designing efficient photocatalyts.

No MeSH data available.


(a) Carrier mobility and effective mass of carrier measured according to Hall effect. (b) Schematic illustration of the enhanced photocatalytic and charge transfer mechanism. The sizes of sphere areas represent the differences in effective mass of electrons (blue) and holes (white).
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f5: (a) Carrier mobility and effective mass of carrier measured according to Hall effect. (b) Schematic illustration of the enhanced photocatalytic and charge transfer mechanism. The sizes of sphere areas represent the differences in effective mass of electrons (blue) and holes (white).

Mentions: where S, kB, T, e, h, md* and n are Seebeck coefficient, Boltzmann constant, absolute temperature, carrier charge, Plank constant, effective mass of hole at Fermi level, and the hole concentration, respectively. As shown in Fig. 5a, the effective mass of holes decreases with the increase of La-doping content, while the mobility shows a reverse trend. The mobility is 1.85 cm2/V·s for pristine BiCuSeO, and increases to 7.75 cm2/V·s and 15 cm2/V·s in Bi0.96La0.04CuSeO and Bi0.92La0.08CuSeO, respectively.


Bi(1-x)La(x)CuSeO as New Tunable Full Solar Light Active Photocatalysts.

Wang H, Li S, Liu Y, Ding J, Lin YH, Xu H, Xu B, Nan CW - Sci Rep (2016)

(a) Carrier mobility and effective mass of carrier measured according to Hall effect. (b) Schematic illustration of the enhanced photocatalytic and charge transfer mechanism. The sizes of sphere areas represent the differences in effective mass of electrons (blue) and holes (white).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4837348&req=5

f5: (a) Carrier mobility and effective mass of carrier measured according to Hall effect. (b) Schematic illustration of the enhanced photocatalytic and charge transfer mechanism. The sizes of sphere areas represent the differences in effective mass of electrons (blue) and holes (white).
Mentions: where S, kB, T, e, h, md* and n are Seebeck coefficient, Boltzmann constant, absolute temperature, carrier charge, Plank constant, effective mass of hole at Fermi level, and the hole concentration, respectively. As shown in Fig. 5a, the effective mass of holes decreases with the increase of La-doping content, while the mobility shows a reverse trend. The mobility is 1.85 cm2/V·s for pristine BiCuSeO, and increases to 7.75 cm2/V·s and 15 cm2/V·s in Bi0.96La0.04CuSeO and Bi0.92La0.08CuSeO, respectively.

Bottom Line: However, efficiently harvesting solar energy for photocatalysis remains a pressing challenge, and the charge kinetics and mechanism of the photocatalytic process is far from being well understood.Our measurements and density-functional-theory calculations reveal that the effective mass and mobility of the carriers in BiCuSeO can be tuned by the La-doping, which are responsible for the tunable photocatalytic activity.Our findings may offer new perspectives for understanding the mechanism of photocatalysis through modulating the charge mobility and the effective mass of carriers and provide a guidance for designing efficient photocatalyts.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China.

ABSTRACT
Photocatalysis is attracting enormous interest driven by the great promise of addressing current energy and environmental crises by converting solar light directly into chemical energy. However, efficiently harvesting solar energy for photocatalysis remains a pressing challenge, and the charge kinetics and mechanism of the photocatalytic process is far from being well understood. Here we report a new full solar spectrum driven photocatalyst in the system of a layered oxyselenide BiCuSeO with good photocatalytic activity for degradation of organic pollutants and chemical stability under light irradiation, and the photocatalytic performance of BiCuSeO can be further improved by band gap engineering with introduction of La. Our measurements and density-functional-theory calculations reveal that the effective mass and mobility of the carriers in BiCuSeO can be tuned by the La-doping, which are responsible for the tunable photocatalytic activity. Our findings may offer new perspectives for understanding the mechanism of photocatalysis through modulating the charge mobility and the effective mass of carriers and provide a guidance for designing efficient photocatalyts.

No MeSH data available.