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Alkaline Anion-Exchange Membrane Fuel Cells: Challenges in Electrocatalysis and Interfacial Charge Transfer
Nagappan Ramaswamy1, Sanjeev Mukerjee1
1Northeastern University Center for Renewable Energy Technology, Department of Chemistry and Chemical Biology , Northeastern University , 317 Egan Research Center, 360 Huntington Avenue , Boston , Massachusetts 02115 , United States.
Chemical Reviews
|November 9, 2019
Summary
Alkaline anion-exchange membrane (AAEM) fuel cells show promise, but face challenges in electrocatalysis and interfacial charge transfer. Addressing these issues is key to improving AAEM fuel cell performance.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Conversion
Background:
- Alkaline anion-exchange membrane (AAEM) fuel cells are gaining interest due to advancements in hydroxide-anion conductive membranes.
- Current AAEM fuel cell performance is compared to proton-exchange membrane (PEM) fuel cells.
Purpose of the Study:
- To analyze overpotential sources in AAEM fuel cells.
- To focus on challenges in electrocatalysis and interfacial charge transfer at alkaline electrode/electrolyte interfaces.
- To explore the potential of alternative small molecule fuels.
Main Methods:
- Critical analysis of hydrogen oxidation and oxygen reduction reactions.
- Investigation of carbonate anion poisoning.
- Examination of ionomer cation-exchange head group adsorption on electrocatalysts.
- Review of precious and nonprecious metal electrocatalysts.
Main Results:
- Identified fundamental causes for higher overpotential in hydrogen oxidation reaction.
- Detailed mechanistic aspects of the oxygen reduction reaction.
- Highlighted challenges related to carbonate poisoning and ionomer adsorption.
- Evaluated alternative small molecule fuel oxidation potential.
Conclusions:
- Continued development of anion-exchange membranes is crucial.
- Electrocatalysis and interfacial charge transfer are key areas for improvement.
- A research roadmap for enhancing AAEM fuel cell performance is proposed.
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