Highly Active Oxygen Evolution Electrocatalysts Based on Cobalt Amide Imidate Imidazolate Frameworks

17 June 2019, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


A family of three imidazolate-based Co-MOFs, IFP-5, -8 and -10 (Imidazolate Framework Potsdam), with different peripheral group –R (-Me, -OMe and –OEt, respectively) have been synthesized by a solvothermal method and tested toward oxygen evolution reaction (OER). Remarkably, IFP-8 presents low overpotentials (319 mV at 10 mA/cm2, and 490 mV at 500 mA/cm2) and extraordinary stability during 120 h, even when used as a catalyst toward overall water splitting reaction. An integrated ex-situ spectroscopic study, based on PXRD, EXAFS, and ATR, allows the identification of the active species and the factors that rule the catalytic activity. Indeed, it was found that the performances are highly affected by the nature of the -R group, because this small change strongly influences the conversion of the initial MOF to the active species. As a consequence, the remarkable activity of IFP-8 can be ascribed to the formation of Co(O)OH phase of few nanometers particle size (3-10 nm) during the electrocatalytic oxygen evolution.


Oxygen Evolution Reaction
Metal-Organic Frameworks
Water Splitting

Supplementary materials

LSV 5mVs-1 up to 500 mV overpotential IFP8 V2


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