A home-built spectroelectrochemical transmission cell was equipped with a 1 mm diameter Ag wire pseudoreference electrode, a 1 mm diameter coiled platinum wire counter electrode, and an IHO or FTO coated glass as the working electrode. The working electrode was either uncoated for background measurements or coated with a PbS QD film. The measurement cell was assembled in a nitrogen-filled glovebox and either filled with 6 mL 0.1 M TBAHFP/MeCN-d 3 or with 0.1 M LiClO 4 /MeCN-d 3 . After assembly, it was transferred outside of the glovebox and placed in a faraday cage for the EMAS measurements.