High-spin transition metal atoms drive acidic oxygen evolution reactions
High-spin transition metal atoms drive acidic oxygen evolution reactions
研究概述
研究内容请参见论文原文。
谱图与表征信息
Fig. 3 | Electronic structure and spin state characterization. a Raman spectra of HSS-CoOx/GDY, Co3O4 and GDY. The inset provides enlarged panels showing the Raman shifts in the range of 2050 cm−1 to 2300 cm−1 for GDY and HHS-CoOx/GDY range. b Co K-edge XANES spectra of Co foil, Co3O4 and HSS-CoOx/GDY (Inside: the enlarged view of the pre-edge (7705 eV to 7710 eV) and edge (7715 eV to 7719 eV) for Co K-edge). c Fourier transforms of k3-weighted EXAFS spectra of Co foil, Co3O4 and HSS- CoOx/GDY, and the inset display the scattering paths and structural model of Co-O, Cooh-Cooh and Cooh-Cotd local environment. d Fitting curve of HSS-CoOx/GDY. Inset: The fitted structural model for HHS-CoOx/GDY. e Model of superconducting quantum interference design. f Magnetic hysteresis loops of HSS-CoOx/GDY, Co3O4 and Com-Co3O4 at 300 K. g FC (field cooled) and ZFC (zero field cooled) magnetization curves of HSS-CoOx/GDY, Co3O4 and Com-Co3O4 as a function of temperature at H = 150 Oe. h The calculated total μeff. The inset shows the contributions of Co2+ (eg4t2g3) and Co3+ (t2g4eg2) to the total μeff. i The volume fraction of Co3+ and corresponding eg orbital filling of HSS-CoOx/GDY, Co3O4 and Com-Co3O4. Inset: Schematic diagram of the transition from a low-spin state to a high-spin state.