Highly Active Oxygen Evolution Electrocatalysts Based on Cobalt Amide Imidate Imidazolate Frameworks
semanticscholar(2019)
摘要
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.
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