Abstract
The catalytic activity and stability of an iron-nickel based oxygen-deficient perovskite for the oxygen evolution reaction (OER) are drastically improved with the ppm additive of Fe ions to the alkaline electrolyte. The enhancement is attributed to a 1–2 nm restructured Ni0.5Fe0.5Ox(OH)2-x (oxy)hydroxide layer, as demonstrated with scanning transmission electron microscopy. La0.6Ca0.4Fe0.7Ni0.3O2.9 shows almost a four-fold increase in OER activity after Fe addition relative to the as-prepared pristine electrolyte, which demonstrates the low Tafel slope of 44 ± 2.4 mV dec−1 and the superior intrinsic activity of 706 ± 71 A g−1oxide at 1.61 V vs. RHE.
Highlights
Efficient water electrolysis is highly desirable for economic branches where pure hydrogen and/or oxygen are used, for instance, in the transport sector with fuel cell electric vehicles, metallurgy, and medicine
We report on the enhanced catalytic activity of
Ca-dopedNi/FeNi/FeIn this work, we report on the enhanced oxygen evolution reaction (OER) catalytic activity of Ca-doped mixedperovskite perovskitewith withthe theadditional additionalpresence presenceofofFe
Summary
Ca doping, which decreases the formation energy of the oxygen vacancies [24]. InInthis work, we search for strategies to further increase the activity and long-term stability work, we search for strategies to further increase the activity and long-term stability ofof thismaterial materialunder underthe the conditions. 0.30.3O wasprepared preparedwith withaamodified modifiedspray spraypyrolysis pyrolysisapproach, approach,asasreported reportedpreviously previouslyby byour our was group[24]. R-3cstructure structurewith withthe theunit unitcell cellparameters parametersa a==5.4797(9). Morphologically,the thesample sampleconsists consistsof ofporous poroushollow hollowspherical sphericalparticles particleswith withdidiameters ametersranging rangingbetween between200
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