Imine Gels Based on Ferrocene and Porphyrin and Their Electrocatalytic Property. Issue 13 (27th May 2020) - Cai, Guangmei
Abstract: A series of porphyrin‐based imine gels have been synthesized via dynamic covalent gelation between 5, 10, 15, 20‐tetra(4‐aminophenyl)‐21H, 23H‐porphyrin (H2 TAPP) derivatives and various aldehyde compounds. The porphyrin‐ferrocene imine gels based on MTAPP (M=H2, Ni 2+, Co 2+, Pd 2+ and Zn 2+ ) and ferrocene‐1, 1′‐dicarbaldehyde (NA) display efficient HER, OER and ORR activities in alkaline media. Among the gels, CoTAPP‐NA shows an HER current density of 10 mA cm −2 at low overpotential of 470 mV and small Tafel slope of 110 mV decade −1 in alkaline media. CoTAPP‐NA also exhibits OER catalytic activity with low overpotential (416 mV for 10 mA cm −2 ). CoTAPP‐NA shows ability in overall water splitting in alkaline media. In addition, CoTAPP‐NA exhibits onset potential ( E p ) of 0.95 V and half‐wave potential ( E 1/2 ) of 0.84 V in 1.0 mol L −1 KOH solution for oxygen reduction. Moreover, the gel catalyst shows good stability. Abstract : Gel electrocatalysis : A series of porphyrin‐ferrocene imine gels have been synthesized via dynamic covalent gelation. The gel catalysts show efficient HER, OER and ORR activities in alkaline media with good stability.