Cell 1 was assembled with YP-50F electrodes (3.3 mg, 3.1 mg, 0.317 cm 2 ) and undiluted BMIM-TFSI electrolyte. Cell 2 had ammonia-modulated Cu3(HHTP)2 electrodes (1.9 mg, 2.0 mg, 0.178 cm 2 ) and 1 M PEt4BF4 in ACN electrolyte. Cell 3 utilised YP-80F electrodes (3.2 mg, 3.1 mg, 0.317 cm 2 ) and 1 M NEt4BF4 in ACN electrolyte. Cell 4 had DMF-modulated Cu3(HHTP)2 electrodes (2.9 mg, 3.1 mg, 0.317 cm 2 ) and 1 M NEt4BF4 in ACN electrolyte. Finally, Cell 5 was prepared with YP-50F electrodes (6.1 mg, 6.6 mg, 0.713 cm 2 ) and 1 M NEt4BF4 in ACN electrolyte. The volume of electrolyte added was kept consistent between cells (approximately 10 drops from a Pasteur pipette). A Whatman glass microfiber filter (GF/A) was used as a separator and was dried under vacuum at 100 °C for 24 h before use. Each coin cell contained two separator disks and one conical spring to ensure adequate pressure in the cells. The coin cells were hermetically sealed at 80 kg cm -2 for 1 min before being removed for testing.