Extended Data Table 1 Comparison of the charge passed for the positive and negative charging processes

From: Capturing carbon dioxide from air with charged-sorbents

  1. During the positive charging process, the integrated charge from chronoamperometry (CA) is larger than that calculated from the capacitance. The charging current remained 12 mA after 4.8 h. This implies that the positive charging process was accompanied by electrochemical carbon oxidation in the KOH electrolyte. However, the porous structure and pore size distribution of the sorbents only changed slightly (around 20% decrease in BET surface area). In contrast, the negative charging process gave the similar charge calculated from both the CA and capacitance measurements, and the charging current decayed to few hundreds nA after 40 min. This finding indicates that a chemical reaction (carbon oxidation) occurred during the positive charging process but not during the negative charging process. * The charge is calculated based on the equation: Q = C×U. Q is the charge passing in the charging process for 1 g carbon fabric ACC-5092-10 cloth, C is the double-layer capacitance (120 F g–1 for carbon fabric ACC-5092-10 cloth in the 6 M KOH at 0.4 V), U is the electric potential.
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