祝贺张晓晨的论文" Synergy of Phosphorus Vacancies and Build-in Electric Field into NiCo/NiCoP Mott-Schottky Integrated Electrode for Enhanced Water Splitting Performance" 发表在Chin Chem Lett。（DOI：10.1016/j.cclet.2023.108519）
Fig. 1. (a) Schematic diagram for the synthesis of NiCo/NiCoP Mott-Schottky heterojunction. (b) XRD pattern of NiCo/NiCoP. SEM images of (c) NiCo-MOF/NF, (d) NiCoP, (e) NiCo/NiCoP. (f) TEM images; (g-i) HR-TEM, (j) SAED pattern, (k) elemental mapping of NiCo/NiCoP.
Fig. 2. XPS spectra of obtained catalysts. (a) XPS survey, (b) Ni 2p, (c) Co 2p, (d) P 2p, (e) O 1s. (f) EPR spectra. (g-i) Energy diagrams of NiCo and NiCoP (Φ: Work function, EF: Fermi level, Evac: Vacuum level, EV: Valence band, EC: Conduction band).
Fig. 3. (a) OER polarization curves. (b) Tafel plots. (c) Electrochemical impedance spectroscopy. (d) Cdl values. (e) Stability tests of NiCo/NiCoP. (f) Comparison of OER activities.
Fig. 4. (a) HER polarization curves. (b) Tafel plots. (c) Electrochemical impedance spectroscopy. (d) Cdl values. (e) Stability tests of NiCo/NiCoP. (f) Comparison of HER activities.
Fig. 5. (a) LSV polarization curves (inset image shows a digital photograph of the two-electrode system). (b) Time-gas evolution amounts for evaluating the Faradic efficiency. (c) Long-term stability test. (d) Comparison of cell votages at 10 mA/cm2 of recently reported overall water splitting electrocatalysts.
Fig. 6. After OER reaction of NiCo/NiCoP sample (a) XRD pattern; (b) SEM image; (c) TEM image (The illustration is SAED pattern); (d) Ni 2p; (e) Co 2p; (f) P 2p.
Fig. 7. The model structures of (a) NiCoP, (b) NiCo/NiCoP, (c) NiCo/NiCoP-Vp. (d) OER Gibbs free energy distribution of different catalysts at 0 V and 1.23 V. (e) HER Gibbs free energy distribution of different catalysts at 0 V. (f) The differential charge density of NiCo/NiCoP-Vp structure (The iso-surface value is 0.005 eV/A3, yellow is the region of electron accumulation and blue is the region of electron dissipation). (g-i) Electrostatic potential distribution diagram.
Scheme 1. Schematic diagram of catalytic performance over NiCo/NiCoP.