Photochromic Single-Unit-Cell ZnIn2S4 Nanosheets with Large Lateral Sizes for Boosting H2O2 Photosynthesis
Photochromic Single-Unit-Cell ZnIn2S4 Nanosheets with Large Lateral Sizes for Boosting H2O2 Photosynthesis
研究概述
制备厚约2.58 nm、横向尺寸超过600 μm的光致变色ZnIn2S4纳米片，利用硫空位改善载流子分离和利用。H2O2与对甲氧基苯甲醛产率分别为12.09和12.57 mmol·g⁻¹·h⁻¹；两相连续流系统获得约200 mL、浓度3.97 wt%的H2O2溶液。
谱图与表征信息
Figure 2. (a) High-resolution XPS spectra of S 2p for various ZIS photocatalysts. (b) Normalized Zn K-edge XANES spectra of various samples. The inset shows an enlargement of the Zn K-edge pre-edge. (c) Fourier-transform (FT) k3-weighted χ(k) function of the EXAFS spectra of various samples at the Zn K-edge. (d) Wavelet transform of the k3-weighted EXAFS of various samples at the Zn K-edge. (e) HRTEM image of ZIS-NS with lattice distortion and defects. (f) Magnified BF-STEM image and (g) strength profile corresponding to the labeled white line. (h) Magnified view of the selected area in (f). (i) Corresponding theoretical structural model of ZIS. (j) EPR spectra of various ZIS photocatalysts. (k) Theoretically calculated density of states (DOS) for ZIS-F (pZIS) and ZIS-NS (ZIS-Sv). (l) Band structures of various ZIS photocatalysts.
Figure 5. (a–c) 3D surface KPFM potential distributions and the corresponding surface potential profiles of ZIS-F, ZIS-L, and ZIS-NS. (d) Transient photocurrent response curves of different ZIS photocatalysts. (e) Electrochemical impedance spectra of different ZIS photocatalysts. Calculated work functions of (f) ZIS-F (pZIS) and (g) ZIS-NS (ZIS-SV). (h) Zn K-edge XANES spectra of ZIS-NS under light and dark conditionss. (i) FT-EXAFS spectra of ZIS-NS under dark and light conditions.