祝贺郝翊茹的论文"Synergetic of Built-In Electric Field and Sulfur Defects in Co@Co9S8 Mott−Schottky To Achieve High-Efficiency Zinc-Air Battery Performance" 发表在ACS Appl. Mater. Interfaces。(DOI: 10.1021/acsami.3c03958)
Figure 1. (a) Synthesis process of Co@Co9S8-NCNT. (b) SEM image, (c) TEM image, (d) HR-TEM image, and (e) elemental mapping image of Co@NCNT. (f) TEM image, (g, h) HR-TEM image, and (i) elemental mapping image of Co@Co9S8-NCNT.
Figure 2. XPS spectra of different samples: (a) Co 2p, (b) C 1s, (c) S 2p, and (d) N 1s. (e) EPR spectrum, (f) Raman spectroscopy, (g) surface valence band photoemission spectra of different catalysts. (h) Energy band diagram of the electronic structure before and after the Mott–Schottky interface contact (Evac: vacuum energy, EF: Fermi level, EC: conduction band, EV: valence band).
Figure 3. OER activity testing in 1 M KOH: (a) LSV curves, (b) Tafel slopes, (c) chronocurrent stability (inset is the LSV curves before and after 5000 CV cycles), and (d) Cdl of the catalysts. ORR performance testing in 0.1 M KOH: (e) LSV curves, (f) Tafel slopes, (g) LSV curves before and after 5000 CV cycles, (h) methanol durability test, and (i) hydrogen peroxide yield (blue) and the corresponding electron transfer number n (red).
Figure 4. (a) Schematic diagram of a ZAB. (b) Power density curves of different catalysts. (c) Charge and discharge polarization curves. (d) Open-circuit voltage stability. (e) Galvanostatic discharge voltage of the assembled ZABs. (f) Photograph of a mechanical fan powered by a homemade ZAB. (g) Long-term cycling performance at 5 mA cm–2 for 170 h.
Figure 5. (a) Co@NCNT, (b) Co@Co9S8-NCNT-VS Gibbs free energy plots of OER. (c) Density of states corresponding to Co@Co9S8-NCNT-VS. (d) d-Band center of different catalysts. (e, f) Electronic structure energy band diagrams of metal Co, CoS, and the Mott–Schottky interface based on Co/CoS (E0: vacuum energy, EF: Fermi level, EC: conduction band, and EV: valence band). Different differential charge densities: (g) Co@NCNT, (h) Co@Co9S8-NCNT, and (i) Co@Co9S8-NCNT-VS (isosurface values are 0.002 eV A–3, yellow is the region of electron accumulation, blue is the region of electron dissipation).