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Organic Redox Flow Batteries 2023

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Organic Redox Flow Batteries 2023 ( organic-redox-flow-batteries-2023 )

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Chapter 1. Introduction into three major research topics, represented by Chapters 4–6, each covering different methods used to characterise the redox-active compounds and the reactor performance. The thesis is structured as follows: Chapter 2 introduces the concept of RFBs, several of the previously explored aqueous inorganic and organic systems, and the components that constitute an RFB. Chapter 3 describes the characterisation methods used throughout this work to inve- stigate the chemical and electrochemical characteristics of redox-active compounds, their cycling performance in symmetric and full flow cells, and the reactor performance. Chapter 4 presents the experimental work carried out while investigating the molecular electrochemistry of quinones and ferri-/ferrocyanide. The electrochemical properties were investigated using standard three-electrode systems. Chapter 5 presents the experimental work concerning the cycling stability and efficiency of single flow cells. Symmetric and full flow cells with quinone and ferri-/ferrocyanide elec- trolytes were cycled over several hours or days to determine the stability and performance of the active compounds. Chapter 6 presents the experimental work conducted to study the reactor performance through in operando electrochemical impedance spectroscopy. The impedance of symme- tric flow cells was recorded while varying the experimental conditions and resolved into contributions from ohmic, charge transfer, and diffusion processes. Chapter 7 provides the overall conclusions of the conducted work and an outlook to future work that could be carried out in continuation of this project. 4

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