Evaluation of hydrogen production and internal resistance in forward osmosis membrane integrated microbial electrolysis cells
2015
Lee, Mi-Young | Kim, Kyoung-Yeol | Yang, Euntae | Kim, In S.
In order to enhance hydrogen production by facilitated proton transport through a forward osmosis (FO) membrane, the FO membrane was integrated into microbial electrolysis cells (MECs). An improved hydrogen production rate was obtained in the FO–MEC (12.5±1.84×10−3m3H2/m3/d) compared to that of the cation exchange membrane (CEM) – MEC (4.42±0.04×10−3m3H2/m3/d) during batch tests (72h). After an internal resistance analysis, it was confirmed that the enhanced hydrogen production in FO–MEC was attributed to the smaller charge transfer resistance than in the CEM–MEC (90.3Ω and 133.4Ω respectively). The calculation of partial internal resistance concluded that the transport resistance can be substantially reduced by replacing a CEM with a FO membrane; decrease of the resistance from 0.069Ωm2 to 5.99×10−4Ωm2.
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