Surface Nanosteps Modulate the Local Environment of Co Single Atoms to Boost the Electrocatalytic Hydrogen Evolution Reaction
Surface Nanosteps Modulate the Local Environment of Co Single Atoms to Boost the Electrocatalytic Hydrogen Evolution Reaction
研究概述
研究内容请参见论文原文。
谱图与表征信息
Figure 2. High-resolution XPS spectra of (a) Co 2p, (b) P 2p in Co−P3/S-TiO2 and Co−P3O/F-TiO2. (c) Ti 2p XPS spectra of TiO2, P-TiO2, Co−P3O/F-TiO2, and Co−P3/S-TiO2. (d) Co K-edge XANES spectra and (e) corresponding FT EXAFS spectra of Co−P3/S-TiO2, Co−P3O/F- TiO2, reference Co foil, and CoO. (f, g) FT k3-weighted fitting curves of Co−P3/S-TiO2 and Co−P3O/F-TiO2 at the Co K-edge. The inset shows the structure of Co−P3 and Co−P3O. The corresponding wavelet transform (WT) contour plots of the EXAFS signals of (h) Co−P3/S-TiO2 and (i) Co−P3O/F-TiO2.
Figure 4. (a) Computed distribution of the electric field near the surface of nanostepped TiO2 with corner angle of 123°. (b) Computed AC+ concentration. (c) Spin density pattern of Co−P3/S-TiO2 and Co−P3O/F-TiO2 from top view and side view, respectively; yellow represents the increase of electrons. The density of states (DOS) patterns of (d) Co−P3/S-TiO2 and (e) Co−P3O/F-TiO2. (f) Co K-edge XANES spectra and (g) the FT k3-weighted fitting curves of Co−P3/S-TiO2 at the Co K-edge recorded at different conditions during electrocatalytic alkaline HER. (h) In situ electrochemical FT-IR spectra recorded with 1.0 M KOH during electrocatalytic HER. (i) Gibbs free energy profiles of alkaline HER over Co−P3/S-TiO2 and Co−P3O/F-TiO2 following the Volmer−Hervoskery pathway. (j) Corresponding coordination configurations.