Molecular adsorption promotes carrier migration: Key step for molecular oxygen activation of defective Bi4O5I2

Oxygen Vacancy Engineering of Bi24O31Cl10 for Boosted Photocatalytic CO2 Conversion

“…[34] For Bi 24 O 31 Cl 10 -OV,anew mediumb inding energy peak waso bserved, which is associated with surface oxygen vacancies. [35] Furthermore, apart from the two intrinsic Bi 3 + peaks in the Bi 4f XPS spectrum of Bi 24 O 31 Cl 10 ,t wo additional peaks with lower binding energies at 164.2 and 158.9 eV were observed for Bi 24 O 31 Cl 10 -OV,w hich were indexed to Bi (3Àx) derivedf rom the existence of oxygen vacancies( Figure S5). [36] As ac onsequenceo fa bundant oxygen vacancies, the absorption band edge of Bi 24 O 31 Cl 10 -OV was significantly expanded to encompass the UV/Vis and near infrared( NIR) light wavelengths (Figure 1f).…”

“…Prior to the hydrogen heat treatment, the O 1s characteristic peaks of Bi 24 O 31 Cl 10 were deconvoluted into two peaks at 529.0 and 531.1 eV, assigned to lattice oxygen (Bi−O) and surface hydroxyl groups (Bi−OH), respectively . For Bi 24 O 31 Cl 10 ‐OV, a new medium binding energy peak was observed, which is associated with surface oxygen vacancies . Furthermore, apart from the two intrinsic Bi 3+ peaks in the Bi 4f XPS spectrum of Bi 24 O 31 Cl 10 , two additional peaks with lower binding energies at 164.2 and 158.9 eV were observed for Bi 24 O 31 Cl 10 ‐OV, which were indexed to Bi (3− x ) derived from the existence of oxygen vacancies (Figure S5) .…”

“…According to previous reports, the oxygen vacancy state can act as a springboard for electron transfer to the surface which are then trapped by oxygen vacancies, thus improving the charge density and carrier separation . The carrier density can be enhanced by introducing oxygen vacancies into the Bi 24 O 31 Cl 10 surface, which is reflected by the smaller slope of the MS plots of Bi 24 O 31 Cl 10 ‐OV than that of Bi 24 O 31 Cl 10 (Figure a) .…”

“…According to previous reports, the oxygen vacancy state can act as as pringboard for electron transfer to the surfacew hich are then trapped by oxygen vacancies, thus improving the charged ensity and carriers eparation. [35] The carrierd ensity can be enhanced by introducing oxygen vacancies into the Bi 24 O 31 Cl 10 surface, which is reflected by the smaller slope of the MS plots of Bi 24 O 31 Cl 10 -OV than that of Bi 24 O 31 Cl 10 (Figure 3a). [38] In the quasi Fermi level, the carrier density difference can be calculated from the Nernst equation and the density of charge carriers can be reflected from the photocurrent onset potentialint he I-V curve in the presence of fast electron acceptor.…”

Bismuth‐Based Photocatalysts for Solar Photocatalytic Carbon Dioxide Conversion

“…For example, the groups of Wang and Chen used this methodt os ynthesize as eries of Bi x O y X z photocatalysts. [39][40][41][42][43] In recent years, the successful syntheses of Bi 3 O 4 X( X= Cl, Br), [44][45][46][47][48] Bi 4 O 5 X 2 (X = Br,I ), [49][50][51][52][53][54] Bi 5 O 7 X (X = Cl, Br,I ), [55][56][57][58] Bi 7 O 9 I 3 , [59][60][61] Bi 12 O 17 X 2 (X = Br,I ), [62][63][64][65][66][67][68][69] Bi 12 O 15 Cl 6 , [39,70] andB i 24 O 31 X 10 (X = Cl,B r) [38,[71][72][73][74] werer eported. As shown in Figure 5, layered Bi 12 O 17 Cl 2 nanosheets with {001} facet exposure were prepared at pH 13.6.…”