Testing of TiS2 in aqueous electrolyte was conducted in a custom-made three-electrode cell made of polyether ether ketone (PEEK), which is described in detail in reference . With the same PVDF binder and composition, the TiS2 slurry was cast on titanium foil current collector (MHUI, 10 µm foil thickness) for use as working electrode. PTFE-bound activated carbon (YP-50F, Kuraray) served as pseudo-reference electrode and an oversized PTFE-bound activated carbon electrode as the counter electrode in 1 M LiTFSI aqueous electrolyte.