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Hydroxide exchange membrane fuel cells (HEMFCs) are a potentially lower-cost hydrogen fuel cell technology; however, ambient levels of CO 2  in air significantly reduce HEMFCs’ performance. In this work, we demonstrate an electrochemically-driven CO 2  separator (EDCS) which can be used to remove ambient levels of CO 2  from air upstream of the HEMFC stack in fuel cell vehicles, protecting it from CO 2 -related performance losses. The EDCS operating window was explored for current density, anode flow, and cathode flow with respect to its impact on CO 2  separation performance. Additionally, gas-phase mass transport was improved by selecting flow fields and gas diffusion layers conducive to the EDCS operating regime. The use of a carbon-ionomer interlayer at the cathode was explored and improved CO 2  removal performance from 77.7% to 98.2% at 20 mA cm −2 . An analytical, 1-D model is used to explain the experimental observations and design improvements. A single-cell, 25 cm 2  EDCS using the aforementioned improved design demonstrated greater than 98% CO 2  removal at a cathode flow rate of 1300 sccm for 100 h with 2.7% hydrogen stack consumption.

Demonstration of Electrochemically-Driven CO2 Separation Using Hydroxide Exchange Membranes

Demonstration of Electrochemically-Driven CO₂ Separation Using Hydroxide Exchange Membranes