Figure shows the Raman spectra of 10 commercial nanoporous carbons from different producers (See Figure for comparison with NMR spectra), and three titanium carbide derived carbons (TiC-CDC) from previous literature. The spectra are sorted according to the capacitance of the carbons in symmetric EDLCs with a standard organic electrolyte (Table ). All Raman spectra exhibit the expected two major components centred around 1340 and 1590 cm -1 , corresponding to the D and G bands, respectively. The D bands of the best performing carbons, TiC-CDC-600, ACS-PC, TiC-CDC-800, and SC-1800, are evidently broader, indicating a wider distribution of different domain sizes as compared with the other studied carbons. This provides initial evidence that nanoporous carbons with broader distributions of domain sizes exhibit enhanced performance in EDLCs. In addition, the peaks at 2300 to 3300 cm -1 resemble modulated bumps more than well-defined second-order peaks for TiC-CDC-600, ACS-PC, TiC-CDC-800, and SC-1800, compared with other carbons with relatively lower capacitive performance (Figure ). Raman spectra (532 nm) of ten commercial nanoporous carbons, with literature spectra also shown for three TiC-CDCs (532 nm), plotted in order of their increasing capacitance. Raman spectra were also acquired at multiple spots and using various spot sizes (Figures ) in consideration of the potential inhomogeneity of the carbons. Gravimetric capacitances of commercial nanoporous carbons were measured in two-electrode symmetric coin cells at 0.05 A/g in 1 M NEt4BF4 (acetonitrile, ACN). Capacitances of TiC-CDCs were extracted from previous literature, measured in two-electrode cell at 5 mA/cm² in 1.5 M NEt4BF4 (ACN) (Table ).