nz2c01288_si_001.pdf (1.86 MB)
Rigorous Evaluation of Liquid Products in High-Rate CO2/CO Electrolysis
journal contribution
posted on 2022-07-18, 14:07 authored by Ming Ma, Zhe Zheng, Wen Yan, Chao Hu, Brian SegerIn this work, the water crossover in CO2 electrolysis
was systematically analyzed with hydrated ions transferring through
ion-selective membranes as charge carriers in three-compartment devices.
We demonstrate that the water crossover leads to a variation in the
electrolyte volume, which plays an important role in the evaluation
of the catalytic selectivity of liquid products. Without considering
the water crossover, the catalytic selectivity of liquid products
could be overestimated with the use of anion exchange membranes and
underestimated with cation exchange membranes, especially when ions
with large hydration numbers transport through membranes for long-term
electrolysis. In addition, a protocol for reliably quantifying liquid
products is proposed for high-rate CO2/CO electrolysis
in three-compartment flow electrolyzers.
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compartment flow electrolyzerscation exchange membranesanion exchange membraneswater crossover leadsliquid products couldhydrated ions transferring2 subwater crossoverliquid productscompartment devicesselective membraneswithout consideringsystematically analyzedimportant roleelectrolyte volumecharge carrierscatalytic selectivity
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