Issue 40, 2019

Investigation of mixed-metal (oxy)fluorides as a new class of water oxidation electrocatalysts

Abstract

The development of electrocatalysts for the oxygen evolution reaction (OER) is one of the principal challenges in the area of renewable energy research. Within this context, mixed-metal oxides have recently emerged as the highest performing OER catalysts. Their structural and compositional modification to further boost their activity is crucial to the wide-spread use of electrolysis technologies. In this work, we investigated a series of mixed-metal F-containing materials as OER catalysts to probe possible benefits of the high electronegativity of fluoride ions. We found that crystalline hydrated fluorides, CoFe2F8(H2O)2 and NiFe2F8(H2O)2, and amorphous oxyfluorides, NiFe2F4.4O1.8 and CoFe2F6.6O0.7, feature excellent activity (overpotential for 10 mA cm−2 as low as 270 mV) and stability (extended performance for >250 hours with ∼40 mV activity loss) for the OER in alkaline electrolyte. Subsequent electroanalytical and spectroscopic characterization hinted that the electronic structure modulation conferred by the fluoride ions aided their reactivity. Finally, the best catalyst of the set, NiFe2F4.4O1.8, was applied as anode in an electrolyzer comprised solely of earth-abundant materials, which carried out overall water splitting at 1.65 V at 10 mA cm−2.

Graphical abstract: Investigation of mixed-metal (oxy)fluorides as a new class of water oxidation electrocatalysts

Supplementary files

Article information

Article type
Edge Article
Submitted
12 Aug 2019
Accepted
09 Sep 2019
First published
10 Sep 2019
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2019,10, 9209-9218

Investigation of mixed-metal (oxy)fluorides as a new class of water oxidation electrocatalysts

K. Lemoine, J. Lhoste, A. Hémon-Ribaud, N. Heidary, V. Maisonneuve, A. Guiet and N. Kornienko, Chem. Sci., 2019, 10, 9209 DOI: 10.1039/C9SC04027G

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