To assess in more detail how well NMR adsorption experiments in the absence of an applied potential predict electrochemical performance, gravimetric capacitance (SI Table ) was plotted as a function of both the BET SSA (Figure , SI Figure ) and in-pore anion population obtained by NMR for composite films of five samples of Ni3(HITP)2 samples (A-E; Figures 4e, SI Figure ). We observe that the NMR characterisation provides a rough indication of gravimetric capacitance through the correlation of the two properties (R 2 = 0.73) (Figure ). For our samples, we found adsorption NMR to predict gravimetric capacitance to a similar accuracy as BET SSA (R 2 = 0.66), which is conventionally used to screen conductive MOF quality (Figure ). As such, there is also a some correlation between in-pore ion population and BET SSA itself (R 2 = 0.76), highlighting the ability of NMR to effectively probe porosity of layered MOFs (Figure ). However, since our NMR experiments probe electrolyteaccessible pore volume, whereas the BET analysis is derived from N2 gas sorption data, we anticipate some deviation between the correlations. This is highlighted by the unexpectedly high BET SSA for Sample E, given its associated gravimetric capacitance and in-pore anion adsorption. Nevertheless, we see that the adsorption NMR experiments still accurately reflect the gravimetric energy storage performance in this sample. Due to the anomalously high BET SSA of the composite film of sample E, the in-pore anion population was also plotted with the BET SSA of the powder MOF samples to further probe the relationship between NMR adsorption and gas sorption experiments (SI Figure ). This showed an improved correlation (R 2 = 0.99), supporting our initial results. Importantly, as our F NMR experiments take only minutes to acquire compared to hours/days for gas sorption measurements, this work shows that adsorption NMR experiments could be used as an alternative to gas sorption where higher throughput screening of MOF samples is required (Figure ).