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Ferrocene and its derivatives, especially ferrocene-based coordination polymers (Fc-CPs), offer the benefits of high thermal stability, two stable redox states, fast electron transfer, and excellent charge/discharge efficiency, thus holding great promise for electrochemical applications. Herein, we describe the synthesis and electrochemical applications of Fc-CPs and reveal how the incorporation of ferrocene units into coordination polymers containing other metals results in unprecedented properties. Moreover, we discuss the usage of Fc-CPs in supercapacitors, batteries, and sensors as well as further applications of these polymers, for example in electrocatalysts, water purification systems, adsorption/storage systems., (© 2020 Wiley-VCH GmbH.)

As redox-active based supercapacitors are known as highly desirable next-generation supercapacitor electrodes, the targeted design of two ferrocene-functionalized (Fc(COOH) 2 ) clusters based on coinage metals, [(PPh 3 ) 2 AgO 2 CFcCO 2 Ag(PPh 3 ) 2 ] 2 ⋅7 CH 3 OH (SC 1 : super capacitor) and [(PPh 3 ) 3 CuO 2 CFcCO 2 Cu(PPh 3 ) 3 ]⋅3 CH 3 OH (SC 2 ), is reported. Both structures are fully characterized by various techniques. The structures are utilized as energy storage electrode materials, giving 130 F g -1 and 210 F g -1 specific capacitance at 1.5 A g -1 in Na 2 SO 4 electrolyte, respectively. The obtained results show that the presence of Cu I instead of Ag I improves the supercapacitive performance of the cluster. Further, to improve the conductivity, the PSC 2 ([(PPh 3 ) 2 CuO 2 CFcCO 2 ] ∞ ), a polymeric structure of SC 2 , was synthesized and used as an energy storage electrode. PSC 2 displays high conductivity and gives 455 F g -1 capacitance at 3 A g -1 . The PSC 2 as a supercapacitor electrode presents a high power density (2416 W kg -1 ), high energy density (161 Wh kg -1 ), and long cycle life over 4000 cycles (93 %). These results could lead to the amplification of high-performance supercapacitors in new areas to develop real applications and stimulate the use of the targeted design of coordination polymers without hybridization or compositions with additive materials., (© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)