The per-atom formation energies of materials listed on the MP website are not consistent with the uncorrected energies shown in the Pourbaix diagrams.

Materials Project Materials Project Data/API
1

According to the description of the energy for each point in the Pourbaix diagram in pourbaix_diagram.py of pymatgen, the uncorrected energy for each point is the formation energy of the substance. However, for MnO₂ with MP-ID mp-510408, its formation energy is -1.776 eV/atom, while the entry.uncorrected_energy is 1.5 eV/atom.

2

@wjx666 Were you able to find any existing solutions on the forum? There’s this existing thread that might help.