Unraveling the Crystal-Field-Mediated Cobalt Spin-State Evolution for Electrocatalytic Ethylene Glycol Oxidation by In Situ X-Ray Emission Spectroscopy
Unraveling the Crystal-Field-Mediated Cobalt Spin-State Evolution for Electrocatalytic Ethylene Glycol Oxidation by In Situ X-Ray Emission Spectroscopy
研究概述
以磷掺杂CoOOH催化PET衍生乙二醇氧化，利用晶格畸变和电子重构促进Co由低自旋转向高自旋，调节C–C键选择性断裂。原位XES和XAS跟踪自旋态变化；P-CoOOH/NF在10 mA/cm²下电位1.26 V，甲酸盐选择性93.7%。
谱图与表征信息
FIGURE 2 Structural characterization of CoOOH with high spin states. (a) Schematic illustration of 3d orbital geometries in CoOOH/NF and P-CoOOH/NF. (b) In situ XES spectra of CoMoO4 during reconstruction. (c) In situ XES spectra of P-CoMoO4 during reconstruction. (d) Co K-edge XAS spectra. (e) R-space XAFS spectra. (f) WT diagram of CoOOH/NF. (g) WT diagram of P-CoOOH/NF. (h) Co L-edge XAS spectra of CoOOH/NF and P-CoOOH/NF. (i) P K-edge XES spectra. (j) O K-edge XAS spectrum (inset; enlarged leading edge of P-CoOOH/NF from 531 to 534 eV). (k) Magnetic hysteresis loops of CoOOH/NF and P-CoOOH/NF were examined at 300 K. (l) Temperature-dependent magnetization (M–T) curves at H = 100 Oe.