1. Limited stable voltage window. Ni3(HITP)2 has a significantly smaller stable voltage window of approx. 1 -1.5 V, compared to approx. 2.5 -2.7 V for YP-50F porous carbon (Figure , Table ). As a result, despite the comparable specific capacitance of Ni3(HITP)2, it has both a lower energy and power density compared to YP-50F porous carbon, as both quantities are dependent on the square of the operating voltage window. This drawback is also seen in many other 2D MOFs, with all MOFs that have been studied with organic electrolytes in the literature having lower stable voltage windows than porous carbons (Table ). This often-ignored disadvantage is a major challenge for the field, and more research is needed to understand and improve the operating voltage windows of 2D MOFs, which would increase both their energy and power densities. One promising route may be to vary and optimise both the metal and ligand present in the MOF. Comparing the stability of Ni3(HITP)2 and Cu3(HHTP)2 reported in the literature reveals that changing the metalligating group combination can modify the stable voltage window. Further optimisation of the metal-ligand combination could find more electrochemically stable combinations with wider stable voltage windows, potentially allowing for MOFs to compete with porous carbons in terms of energy and power densities in the future. We believe that developing a better understanding of the degradation mechanisms of current MOF-based supercapacitors that occur at higher voltages is crucial to tackling this challenge.