docs: def from_dict(cls, d):
          """
          Invokes
          """
          entry_type = d["entry_type"]
          if entry_type == "Ion":
              entry = IonEntry.from_dict(d["entry"])
          else:
              entry = PDEntry.from_dict(d["entry"])
          entry_id = d["entry_id"]
          concentration = d["concentration"]
          return PourbaixEntry(entry, entry_id, concentration)