Adsorption of bromine complexing agents on platinum electrocatalysts and prevention through polydopamine coatings

Samuel S. Hardisty, Nagaprasad Reddy Samala, Ilya Grinberg, David Zitoun

Research output: Contribution to journalArticlepeer-review


Bromine complexing agents (BCAs) are seen as a promising route to mitigate the potential health and environmental risks of the bromine-based redox-flow batteries, like the hydrogen bromine redox flow battery (H2–Br2 RFB). The most studied BCAs are based on the pyridinium anion, which may adsorb and inhibit the Pt catalyst required in the H2–Br2 RFB system for the hydrogen reactions. Herein the effect of two BCAs (ethyl-pyridinium bromide and hexyl-pyridinium bromide) on a Pt electrocatalyst are studied, along with a potential methodology to prevent adsorption of the BCA through a polydopamine (PDA) coating. The results show that the pyridinium anion is adsorbed on Pt throughout a large potential range (−0.02 to 1.0 V), reducing the availability of the surface for the adsorption of other species. The PDA coating prevented this adsorption, but itself experiences adsorption of the BCA leading to some reduction in its porosity.

Original languageEnglish
Pages (from-to)31342-31349
Number of pages8
JournalInternational Journal of Hydrogen Energy
Issue number73
StatePublished - 26 Aug 2022

Bibliographical note

Funding Information:
The authors thank Dr. Peter Fischer, Dr. Ran Elazari and Mr. Michael Kuttinger for fruitful discussions on bromine complexing agents. This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement no. 765289 – Flowcamp.

Publisher Copyright:
© 2022 Hydrogen Energy Publications LLC


  • Bromine
  • Bromine complexing agent
  • Hydrogen
  • Platinum


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