Linear Conjugated Coordination Polymers for Electrocatalytic Oxygen Evolution Reaction.

Abstract

Conjugated coordination polymers (CCPs) have attracted extensive attention for various applications related to energy storage and conversion in the past few years, despite that there are many CCPs with unclear chemical states and structures. Here, linear CCPs (LCCPs), with metal-O4 active sites grown on carbon paper (CP) for oxygen evolution reaction (OER), are presented. The LCCPs with high crystallinity and simple structures exhibit the order of electrocatalytic activity of Co-O4 >Ni-O4 >Fe-O4 in terms of the metal-O4 centers. The Co-based LCCP shows higher OER performance (263mV at 10mAcm-2 ) and better durability (90h at 30mAcm-2 ) than commercial IrO2 /CP. The structures and chemical states of LCCPs are carefully investigated, and density functional theory is used to reveal the mechanism of OER at the central metal site. This investigation into LCCPs provides new sights for a better understanding of CCPs and expands the applications of LCCPs with metal-O4 sites.