Using an established literature method, freestanding composite electrode films were prepared . The electroactive material(s) were mixed with ethanol (approx. 1.5 mL) and the mixture was sonicated for 5 min to create a loose slurry. This slurry was combined with polytetrafluoroethylene (PTFE) dispersion (60 wt% in water) in a few drops of ethanol. The mixture was manually stirred under ambient conditions until a film was formed. To ensure homogeneity, the film was kneaded for 20 min and then rolled into a freestanding electrode film. The film was then dried under vacuum at 75 -100 °C for a minimum of 48 h to eliminate any remaining ethanol. To guarantee high rate performance, acetylene black (Thermo Fisher Scientific; measured BET area = 62 m 2 g -1 ) was added to films made with ammonia-and DMFmodulated Cu3(HHTP)2. In these films, the masses of components were calculated so that the final films had a composition of 85 wt% Cu3(HHTP)2, 10 wt% acetylene black, and 5 wt% PTFE. Films made with YP-50F and YP-80F activated carbons did not require any added conductive additive, and therefore had a final composition of 95 wt% activated carbon and 5 wt% PTFE. All films were of uniform thickness, measuring between 250 -270 μm.