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Title: Sampling dynamics for pressurized electrochemical cells

A model describing the gas distribution within a constant pressure electrolysis system and how the distribution impacts electrochemical efficiencies is presented. The primary system of interest is the generation of syngas (CO and H2) associated with the co-electrolysis of H2O and CO2. The model developed for this system takes into account the primary process variables of operation including total system pressure, applied current, the in-flow of reactant gases. From these, and the chemical equilibria within the system, the impact on electrochemically generated gases is presented. Comparing the predicted and measured faradaic efficiency of electrode processes with the expected efficiency from experimental data indicates an offset between the two exists. Methods to minimize and account for the discrepancy are presented with the goal of being able to discern, in a real time manner, degradation of electrode performance. Comparison of the model to experimental data shows a strong correlation between the two with slight variation in experimental data which is attributed to reversible system dynamics such as wetting of the gas diffusion electrode used as the cell cathode.
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Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0021-891X
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Electrochemistry; Journal Volume: 44; Journal Issue: 7
Research Org:
Idaho National Laboratory (INL)
Sponsoring Org:
Country of Publication:
United States
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 10 SYNTHETIC FUELS co-electrolysis; CO2 reduction; electroreduction; pressure; syngas