Redox‐mediated Processes

Chapter 5 Redox-mediated Processes Danick Reynard, Danick Reynard EPFL Valais Wallis, École Polytechnique Fédérale de Lausanne, Laboratoire d'Electrochimie Physique et Analytique, Rue de l'Industrie 17, Case Postale 440, CH-1951 Sion, SwitzerlandSearch for more papers by this authorMahdi Moghaddam, Mahdi Moghaddam University of Turku, Research Group of Battery Materials and Technologies, Department of Mechanical and Materials Engineering, 20014 Turku, FinlandSearch for more papers by this authorCedrik Wiberg, Cedrik Wiberg University of Turku, Research Group of Battery Materials and Technologies, Department of Mechanical and Materials Engineering, 20014 Turku, FinlandSearch for more papers by this authorSilver Sepp, Silver Sepp University of Turku, Research Group of Battery Materials and Technologies, Department of Mechanical and Materials Engineering, 20014 Turku, FinlandSearch for more papers by this authorPekka Peljo, Pekka Peljo University of Turku, Research Group of Battery Materials and Technologies, Department of Mechanical and Materials Engineering, 20014 Turku, FinlandSearch for more papers by this authorHubert H. Girault, Hubert H. Girault EPFL Valais Wallis, École Polytechnique Fédérale de Lausanne, Laboratoire d'Electrochimie Physique et Analytique, Rue de l'Industrie 17, Case Postale 440, CH-1951 Sion, SwitzerlandSearch for more papers by this author Danick Reynard, Danick Reynard EPFL Valais Wallis, École Polytechnique Fédérale de Lausanne, Laboratoire d'Electrochimie Physique et Analytique, Rue de l'Industrie 17, Case Postale 440, CH-1951 Sion, SwitzerlandSearch for more papers by this authorMahdi Moghaddam, Mahdi Moghaddam University of Turku, Research Group of Battery Materials and Technologies, Department of Mechanical and Materials Engineering, 20014 Turku, FinlandSearch for more papers by this authorCedrik Wiberg, Cedrik Wiberg University of Turku, Research Group of Battery Materials and Technologies, Department of Mechanical and Materials Engineering, 20014 Turku, FinlandSearch for more papers by this authorSilver Sepp, Silver Sepp University of Turku, Research Group of Battery Materials and Technologies, Department of Mechanical and Materials Engineering, 20014 Turku, FinlandSearch for more papers by this authorPekka Peljo, Pekka Peljo University of Turku, Research Group of Battery Materials and Technologies, Department of Mechanical and Materials Engineering, 20014 Turku, FinlandSearch for more papers by this authorHubert H. Girault, Hubert H. Girault EPFL Valais Wallis, École Polytechnique Fédérale de Lausanne, Laboratoire d'Electrochimie Physique et Analytique, Rue de l'Industrie 17, Case Postale 440, CH-1951 Sion, SwitzerlandSearch for more papers by this author Book Editor(s):Christina Roth, Christina RothSearch for more papers by this authorJens Noack, Jens NoackSearch for more papers by this authorMaria Skyllas-Kazacos, Maria Skyllas-KazacosSearch for more papers by this author First published: 06 January 2023 https://doi.org/10.1002/9783527832767.ch5 AboutPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Summary In 2006, the concept of redox targeting was introduced in which solubilized redox-active molecules are used to mediate reversible electron transfer reactions. The aim was to address conductivity concerns rising from insulating lithium-insertion material (e.g. LiFePO 4 particles) by using freely diffusing molecules as relays between the current collector and the solid electroactive material. The solubilized molecules were selected such that the standard potential window matches the Fermi level of the solid material to allow spontaneous and reversible charge transfer at the solid–liquid interface. In 2013, the concept was further developed to enhance the energy density of a flow battery. The redox-mediated flow battery includes both solid redox materials (redox booster stored in the tank) and solubilized redox species (redox mediators) to store and carry the charge of the battery, respectively. The mediators are reversibly oxidized or reduced inside the flow cell and transported into the charge storage tanks, where they will drive mediated-electron transfer reactions to charge and discharge the redox boosters. High-energy density solid redox materials can be used to boost the relatively low energy density of a conventional flow battery. In this chapter, we will first discuss the fundamental theory behind redox-mediated processes. Then, we will provide a complete and detailed literature review on reported systems emerging from this concept in the field of redox-flow battery going from redox solid booster to dual-circuit flow battery. References Dennison , C.R. , Vrubel , H. , Amstutz , V. et al. ( 2015 ). Redox flow batteries, hydrogen and distributed storage . Chimia (Aarau) 69 ( 12 ): 753 – 758 . https://doi.org/10.2533/chimia.2015.753 . Amstutz , V. , Toghill , K.E. , Powlesland , F. et al. ( 2014 ). Renewable hydrogen generation from a dual-circuit redox flow battery . Energy & Environmental Science 7 ( 7 ): 2350 – 2358 . https://doi.org/10.1039/C4EE00098F . Reynard , D. , Bolik-Coulon , G. , Maye , S. , and Girault , H.H. ( 2020 ). 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