Abstract
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.
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