fig3

Figure 3. Growth rate of Mo₂C within and between MoO₂ NPs. (A-J) In-situ TEM images of structural evolution from stacked MoO₂ NPs to Mo₂C under 20 vol.% CH₄/H₂ atmosphere at 700 °C; (K) The carbonization rates within and between MoO₂ NPs. The boxes represent the growth rate of two-dimensional area of porous Mo₂C. Blue numbers represent the number of interfaces with Mo₂C growth crossing between MoO₂ NPs, and the capital letters represent the corresponding TEM images in (B-J). NPs: Nanoparticles; TEM: transmission electron microscopy.