hybrid redox flow batteries with zinc negative electrodes

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hybrid redox flow batteries with zinc negative electrodes ( hybrid-redox-flow-batteries-with-zinc-negative-electrodes )

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Accepted manuscript for Renewable and Sustainable Energy Reviews. 24 Jan. 2018 The characteristics and performance of hybrid redox flow batteries with zinc negative electrodes for energy storage Luis F. Arenas,a Adeline Loh,b David P. Trudgeon,b Xiaohong Li,b Carlos Ponce de León,a Frank C. Walsh a* a. Electrochemical Engineering Laboratory, Energy Technology Group, Department of Mechanical Engineering, University of Southampton, SO17 1BJ, UK. b. Renewable Energy Group, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Penryn Campus, Cornwall TR10 9FE, UK. * Author for correspondence, f.c.walsh@soton.ac.uk Abstract Zinc negative electrodes are well known in primary batteries based on the classical Leclanché cell but a more recent development is the introduction of a number of rechargeable redox flow batteries for pilot and commercial scale using a zinc/zinc ion redox couple, in acid or alkaline electrolytes, or transformation of surface zinc oxides as a reversible electrode. The benefits and limitations of zinc negative electrodes are outlined with examples to discuss their thermodynamic and kinetic characteristics along with their practical aspects. Four main types of redox flow batteries employing zinc electrodes are considered, the zinc-bromine, zinc- cerium, zinc-air and zinc-nickel. Problems associated with zinc deposition and dissolution, especially in acid media, are summarised. The main features of each battery are identified and the benefits of a flowing electrolyte are explained. In each case, a summary of their development, including the electrode and cell reactions, their potentials, the performance of the positive and negative electrodes, the benefits of a single flow compartment and cell developments for energy storage are included. Remaining challenges are highlighted and possibilities for future advances in redox flow batteries are suggested. Keywords: air electrode; bromine; cerium; energy storage; nickel; redox flow battery. 1

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