Extended Data Fig. 4: TEM, SEM and EDX studies.
From: Vacancy-enabled N2 activation for ammonia synthesis on an Ni-loaded catalyst
a–d, Atom-resolved HR-TEM image of LaN regions in fresh (a, b) and N-deficient (c, d) Ni/LaNV along the (111) (a, c, d) and (001) (b) directions. The inset of a shows the corresponding crystal structure of LaN along the (111) direction. The inset of b shows the (001) direction of LaN. La and N atoms are represented as grey and blue balls, respectively. e, HR-TEM images and EDX mapping results for Ni(12.5 wt%)/LaN nanoparticles after 100 h of reaction. f–j, SEM and corresponding EDX analysis of fresh (f) and used (g–j) Ni(5 wt%)/LaN bulk after 100 h of reaction. Reaction conditions: catalyst, 0.1 g; WHSV, 36,000 ml gcat−1 h−1; 400 °C, 0.1 MPa.
