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

preprint
submitted on 13.06.2019 and posted on 17.06.2019 by Alberto Bucci, Suvendu Sekhar Mondal, Vlad Martin-Diaconescu, Alexandr Shafir, Julio Lloret-Fillol

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.

Funding

H2020-ERC-2015-CoG

H2020-FETPROACT-01-2016 A-LEAF

CTQ2016-80038-R

CTQ2017-86936-P

AGAUR 2017-SGR-1647

History

Email Address of Submitting Author

jlloret@iciq.es

Institution

Institut Catala de Inverstigacio Quimica (ICIQ)

Country

Spain

ORCID For Submitting Author

0000-0001-9173-1105

Declaration of Conflict of Interest

No conflict

Version Notes

Draft paper

Exports