Unravelling dynamic electronic coupling in oxygen-bridged Pt2 dual-atom sites for ultrastable and sensitive biosensing
Unravelling dynamic electronic coupling in oxygen-bridged Pt2 dual-atom sites for ultrastable and sensitive biosensing
研究概述
研究内容请参见论文原文。
谱图与表征信息
Figure 1. Synthetic scheme and morphological characterization of Pt2-N4O2/CB. (a) Schematic illustration of the Pt2-N4O2/CB synthesis. (b) FESEM image of Pt2-N4O2/CB. (c) AC–HAADF–STEM image of Pt2-N4O2/CB. Inset: dual-atom is marked with a rectangle. Scale bar: 1 nm. (d) 3D map from high-resolution transmission electron microscopy image of the neighboring two atoms (yellow rectangle in Figure 1c). (e) Statistical analysis of the distances between the adjacent bright dots in HAADF–STEM images. (f) L3-edge XANES spectra. (g) FT-EXAFS spectra. (h) FT-EXAFS fitting curve. The inset shows the proposed local atomic structure model. (i) WT analysis. (j) Schematic illustration of the fitting method for the near-edge region.
Figure 4. In-situ XANES of Pt2-N4O2/CB for DA sensing performance. (a) Diagram of electrochemical cell for in-situ XANES measurement. (b) In-situ Pt L3-edge XANES spectra of Pt2-N4O2/CB collected during the forward potential sweep (the embedded images correspond to the local magnified view). (c) Contour plots of the white line intensity versus potential at the Pt L3-edge. (d) In-situ Pt L3-edge XANES spectra of Pt2-N4O2/CB collected during the reverse potential sweep (the embedded images correspond to the local magnified view). OCP: open-circuit potential.