Ambient synthesis of iron-nickel amorphous coordination polymer nanosheet arrays for highly efficient oxygen evolution electrocatalysis

摘要

Two-dimensional (2D) coordination polymers, including metal-organic frameworks (MOFs) and infinite coordination polymers (ICPs), have been regarded as promising electrocatalysts. Although much effort has been devoted to investigating the electrocatalytic performance of MOFs, only a few reports are available on ICPs. Here, a facile room-temperature strategy has been developed to synthesize an iron-nickel amorphous ICP (Ni2Fe-ICP) nanosheet array on Ni foam as a self-supported electrode. Ni2Fe-ICP exhibits excellent electrocatalytic performance in the oxygen evolution reaction (OER). Specifically, Ni2Fe-ICP shows a low overpotential of 275 mV at a current density of 100 mA cm(-2), outperforming commercial RuO2, and has superior stability at a high current density (150 mA cm(-2) can be retained for at least 30 h). Furthermore, the real OER active species are revealed to be metal oxides that evolve during the OER process. (C) 2021 Elsevier B.V. All rights reserved.