Figure 1.

Characterization of the As-prepared ND Nanozymes

(A–H) (A) Preparation scheme of ND nanoparticles, (B and C) TEM images, (D) high-resolution TEM image of ND nanozymes, (E) the size distribution determined from (B), (F) X-ray diffraction pattern, (G) energy-dispersive X-ray spectrum, and (H) scanning transmission electron microscopic elemental mapping (Ni, S, merge) of the ND nanozymes.

(I–K) XPS characterization of ND nanozymes. The survey spectra (I) and the core level spectra of (J) Ni 2p and (K) S 2p.

See also Figure S1.