The sorption capacity of thicker BPL electrodes prepared by hot-pressing improved to 90 mmol.kg -1 compared to previously reported values of ∼60 mmol.kg -1 for thinner electrodes prepared without hot-pressing. However, the sorption capacity of BPL-AC is still 3.5 times less than GR-AC at -1 V (89.8 mmol.kg -1 vs 312 mmol.kg -1 ), three times less than GR-AC at -1.2 V (127 mmol.kg -1 vs 384 mmol.kg -1 ), 2.7 times less than GR-AC at -1.4 V (173 mmol.kg - 1 vs 461 mmol.kg -1 ), and 2.4 times less than GR-AC at -1.6 V (200 mmol.kg -1 vs 485 mmol.kg - 1 (Table ). The decreasing difference in adsorption capacities at higher voltages indicate that BPL-AC initially had less many accessible pores compared to GR-AC at -1 V, but the pore utilization ratio of BPL-AC improves as the voltage window increases because more energy is available to force adsorption in small micropores. Similarly, the adsorption rate of BPL-AC is around 2 times less than GR-AC at -1 V, and 1.6 times less at -1.6 V (Figure and Table ).