2, Institut des Matériaux Jean Rouxel (IMN), Nantes, , France
The urgent need for cleaner energy technologies calls for a radical change in the energy mix to favor renewable energy (+138.5 GW added in 2016 ) and environmentally responsible energy storage solutions. Within this background, the development of reliable, efficient, low-polluting and low-cost electrochemical storage systems can be considered as particularly important. Among the various possible technologies, Redox Flow Batteries (RFBs) is believed as suitable devices for large-scale energy storage . Basically, both physico-chemical and electrochemical properties of the selected redox-active species are particularly crucial. Thus their solubility, chemical stability and the resulting output voltage (after assembly) define the energy density, the cyclability and the power density of the system, respectively. Interestingly, the use of organic electroactive species enable access to low cost and possibly greener compounds because composed of naturally abundant elements. Moreover, they offer high structural designability through the well-established principles of organic chemistry and notably access to both n- and p-type electrochemical storage mechanisms [3–5].
As part of our ongoing effort in developing novel Aqueous Organic Redox Flow Batteries (ORFBs), we will present our recent results dealing with the synthesis and characterizations of a novel highly soluble organic derivative used as catholyte and based on the stable tetramethylpiperidine N–oxyl moiety [6,7]. The electrochemical properties of the catholyte will be reported as well as preliminary data obtained in a full flow battery configuration.
 H. Chen, G. Cong, Y.-C. Lu, Journal of Energy Chemistry 27 (2018) 1304–1325.
 X. Wei, W. Pan, W. Duan, A. Hollas, Z. Yang, B. Li, Z. Nie, J. Liu, D. Reed, W. Wang, V. Sprenkle, ACS Energy Lett. 2 (2017) 2187–2204.
 P. Leung, A.A. Shah, L. Sanz, C. Flox, J.R. Morante, Q. Xu, M.R. Mohamed, C. Ponce de León, F.C. Walsh, J. Power Sources 360 (2017) 243–283.
 J. Winsberg, T. Hagemann, T. Janoschka, M.D. Hager, U.S. Schubert, Angew. Chem. Int. Ed. Engl. 56 (2017) 686–711.
 Q. Zhao, Z. Zhu, J. Chen, Adv. Mater. 29 (2017).
 K. Nakahara, K. Oyaizu, H. Nishide, Chem. Lett. 40 (2011) 222–227.
 J.E. Nutting, M. Rafiee, S.S. Stahl, Chem. Rev. 118 (2018) 4834–4885.