ez4000059_si_001.pdf (1.11 MB)
Harvesting Energy from CO2 Emissions
journal contribution
posted on 2014-01-14, 00:00 authored by H. V. M. Hamelers, O. Schaetzle, J. M. Paz-García, P. M. Biesheuvel, C. J. N. BuismanWhen two fluids with different compositions are mixed, mixing energy
is released. This holds true for both liquids and gases, though in
the case of gases, no technology is yet available to harvest this
energy source. Mixing the CO2 in combustion gases with
air represents a source of energy with a total annual worldwide capacity
of 1570 TWh. To harvest the mixing energy from CO2-containing
gas emissions, we use pairs of porous electrodes, one selective for
anions and the other selective for cations. We demonstrate that when
an aqueous electrolyte, flushed with either CO2 or air,
alternately flows between these selective porous electrodes, electrical
energy is gained. The efficiency of this process reached 24% with
deionized water as the aqueous electrolyte and 32% with a 0.25 M monoethanolamine
(MEA) solution as the electrolyte. The highest average power density
obtained with a MEA solution as the electrolyte was 4.5 mW/m2, significantly higher than that with water as the electrolyte (0.28
mW/m2).