Fig. 7: Changes in valence states after the stability test.
XPS spectra of (a–c) NiFe0.3MoOx, and d–f NiFe0.3Ox for Ni 2p, O1s, and Fe 2p regions. The symbols (♥) and (♣) stand for as-produced and after stability test, respectively.
Fig. 7: Changes in valence states after the stability test. | Communications Materials
