Cyclic Performance Analysis of Hydrogen/Bromine Flow Batteries for Grid-Scale Energy Storage

TitleCyclic Performance Analysis of Hydrogen/Bromine Flow Batteries for Grid-Scale Energy Storage
Publication TypeJournal Article
Year of Publication2014
AuthorsCho, Kyu-Taek, Michael C. Tucker, Markus Ding, Paul L. Ridgway, Vincent S. Battaglia, Venkat Srinivasan, and Adam Z. Weber
JournalChemPlusChem
Volume80
Issue2
Pagination402 - 411
Date Published02/2015
Abstract

This paper explores the critical factors dominating the cycle performance of the hydrogen/bromine redox flow battery (RFB). Carbon electrode oxidation to CO2 was seen as the dominant side reaction, which can be prevented by operating the cell below 1.4 V. Crossover of bromide species from the positive to the negative electrode, especially during charge, dominates the coulombic efficiency, and can result in dissolution of the Pt catalyst if an adequate hydrogen supply is not maintained. This paper also describes the tradeoffs in voltaic, energy, and coulombic efficiencies during cycling, including the determination of the peak energy efficiency with respect to the HBr concentration and current density. Long-term cycling demonstrates negligible cell-component degradation over 600 cycles (approximate to 3 months), with capacity loss caused by the bromine from the system, which can be mitigated by proper system design. The data and methodologies provided in this paper can be used to understand better the operation of this and other RFBs.

DOI10.1002/cplu.201402043
Short TitleChemPlusChem
DOI10.1002/cplu.201402043