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In our proof-of-concept studies we used several low-cost natural precursors for the formation of microporous carbons: cellulose, potato starch, and eucalyptus wood saw dust. The hydrochars were produced at 230–250 C, crushed into powders and activated at 700–800 C. The produced carbons were labelled according to the name of the initial organic precursors and the activation temperature: AC-C700 and AC-C800 (from cellulose), AC-S700 (from starch), AC-W700 and AC-W800 (from wood). Regardless of the preparation conditions and carbon precursor, the resulting activated carbon particles were 1–20 μm in size and exhibited irregular shape with sharp corners (Figure 1 a). Raman spectroscopy also revealed little sample-to-sample variations in the shape, position, width and relative integrated intensities of the peaks. Figure 1 b shows typical Raman spectra of an activated hydrochar (sample AC-C700). The …