Activating the O−O Coupling through NiMoO4-CeO2 Nano-Heterojunction with Abundant Oxygen Vacancies for Efficient Electrocatalytic Water Oxidation
Activating the O−O Coupling through NiMoO4-CeO2 Nano-Heterojunction with Abundant Oxygen Vacancies for Efficient Electrocatalytic Water Oxidation
研究概述
通过缺陷工程构筑富氧空位NiMoO4–CeO2花状异质结，协同激活晶格氧并促进O—O偶联。100 mA/cm²下析氧过电位229 mV；XAFS、计算及18O同位素在线质谱支持晶格氧机制，并展示长期稳定性。
谱图与表征信息
FIGURE 2 XAFS characterization results. (a) Ni K-edge XANES of NiMoO4@CeO2-Ov, Ni2O3, NiO, and Ni foil as reference. (b) Fouriertransformed k3-weighted EXAFS spectra of the above samples. (c) Ni K-edge WT-EXAFS contour map of NiMoO4@CeO2-Ov. (d) Ce L3-edge XANES spectra of NiMoO4@CeO2-Ov and reference sample CeO2 standard. (e) Fourier-transformed k2-weighted EXAFS spectra of the above samples. (f) Ce L3-edge WT-EXAFS contour map of NiMoO4@CeO2-Ov. (e) EPR signals for NiMoO4@CeO2-Ov and NiMoO4@CeO2. (h) Schematic diagram of the heterogeneous interface structure of NiMoO4@CeO2-Ov.