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Understanding Multi-Ion Transport Mechanisms in Bipolar Membranes.
Justin C Bui1,2, Ibadillah Digdaya3, Chengxiang Xiang3
1Department of Chemical and Biomolecular Engineering, University of California Berkeley, Berkeley, California 94720, United States.
ACS Applied Materials & Interfaces
|November 10, 2020
Summary
Bipolar membranes (BPMs) enable efficient electrolysis by managing pH gradients. This study models ion transport in BPMs, highlighting water dissociation and ion crossover as key factors for improving device performance and lifetime.
Area of Science:
- Electrochemistry
- Materials Science
- Chemical Engineering
Background:
- Bipolar membranes (BPMs) are crucial for electrolysis and electrosynthesis due to their ability to create large pH gradients.
- These pH gradients facilitate favorable electrocatalytic environments at electrodes.
- Understanding ion transport, water dissociation, and ion crossover within BPMs is vital for efficient device operation.
Purpose of the Study:
- To develop and validate a continuum model for multi-ion transport in BPMs.
- To investigate the kinetics of water dissociation and ion crossover phenomena.
- To identify key parameters influencing BPM performance and longevity.
Main Methods:
- Development of a continuum model for multi-ion transport.
- Fitting the model to experimental data to determine ionic species concentration profiles.
- Performing sensitivity analysis to evaluate performance-enhancing strategies.
Main Results:
- The model accurately describes internal concentration polarization and ion crossover within BPMs.
- The significance of water-dissociation catalysts and salt-ion crossover was demonstrated.
- Internal concentration profiles for all ionic species were determined.
Conclusions:
- BPM performance and lifetime can be significantly improved.
- Optimization strategies include using thinner dissociation catalysts, managing water transport, and controlling layer thickness.
- Increasing ion-exchange capacity enhances water-dissociation kinetics at the interface.
Keywords:
CO2 reductionbipolar membraneelectrochemistryelectrolysisionomersmodeltransportwater splittingMore Related Videos
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