Fig. 4
From: Bottom-up growth of homogeneous Moiré superlattices in bismuth oxychloride spiral nanosheets
Charge carriers characterization and photocatalysis of BiOCl MSLs. a Charge density differences between the bilayers (in AA-stack) of BiOCl MSL and individual monolayers (in HH-stack) of BiOCl bulk. The isosurface value is 0.002 electrons/Å3 and the charge accumulation and depletion are denoted in yellow and blue, respectively. b, c Comparison of XANES (Cl K-edge) and EXAFS spectra collected on BiOCl bulk and BiOCl MSL samples, respectively. In (b) the pre-edge P1 and P2 peaks represent the transitions from Cl 1s orbital to unoccupied hybridized Bi 6p and Cl 3p orbitals, and the P3 peak represents the Cl 1s → Cl 4p transition63. d The near-field amplitude image from s-SNOM measurement showing distribution of free carriers. One observes that the centered MSL region shows the lower local carrier density indicated by the weaker near-field amplitude (scale bar: 500 nm). e Photocatalytic degradation rate of Rhodamine B versus time without catalyst and with BiOCl bulk, BiOCl MSL nanosheets as catalysts. Negative time denotes dark condition before light irradiation. The measurements are taken under simulated sunlight equipped with an AM 1.5 G filter (UV-Vis) and visible-light (Vis) irradiation, respectively. f Transient photocurrent response versus time without bias, measured in a 0.5 mol L−1 Na2SO4 aqueous solution and the Ag/AgCl reference electrode under visible-light irradiation
