Fig. 8. (a) Systematic illustration of the fabricated devices for Cu-PYDC MOF//AC (b) CV comparison of AC and Cu-PYDC MOF at 10 mV s⁻¹ (c) CV of Cu-PYDC MOF//AC from 3 mV s⁻¹ to 100 mV s⁻¹ (d) GCD curve of Cu-PYDC MOF//AC at different current densities.