For EMAS measurements a home-built spectroelectrochemical transmission cell, equipped with a 1 mm diameter Ag wire pseudoreference electrode, a 1 mm diameter coiled platinum wire counter electrode and a fluorine doped tin oxide (FTO) coated glass as working electrode was used. The working electrode was either coated with 2H-MoS2 nanosheets as described above, or uncoated for reference measurements. The measurement cell was filled with 6 mL 0.1 M n-Bu4NPF6/CH3CN and assembled within a glovebox. For the actual measurements, it was afterwards transferred outside of the box and placed in a faraday cage.