首页|Activity of carbon-encapsulated Ni_(12-x)FexP5 catalysts for the oxygen evolution reaction:Combination of high activity and stability
Activity of carbon-encapsulated Ni_(12-x)FexP5 catalysts for the oxygen evolution reaction:Combination of high activity and stability
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Rational design of efficient,earth-abundant,and durable electrocatalysts to accelerate the oxygen evolution reaction(OER)is critical for hydrogen ion by water electrolysis.In the present work,nanostructured Ni_(12-x)FexP5(x = 1.2,2.4,3.6)OER electrocatalysts synthesized by a colloidal method is reported.For x = 1.2,an alloy of Ni,Fe,and P is formed.For x = 2.4 or x = 3.6,a core-shell NiFeP@Fe3O4 structure is formed.The nanoparticles are encapsulated in a self-generated carbon layer.The carbon layer is formed during synthesis from synthesis residues.The carbon-encapsulated Ni_(9.6)Fe_(2.4)P5 catalyst offers the outstanding mass activity of 0.1 A mg~(-1)and overpotential of 220 mV at 10 mA cm~(-2),assigned to a combination of enhanced electrical conductivity provided by the carbon shell,a large surface area,and a high specific catalytic activity.Post-mortem characterization indicates that the carbon encapsulation remains intact under conditions of the OER.
Water electrolysisOxygen evolution reactionNickel-iron phosphideCarbon encapsulation
Fatemeh Poureshghi、Frode Seland、Jens Oluf Jensen
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Department of Materials Science and Engineering,Norwegian University of Science and Technology(NTNU),N-7491Trondheim,Norway
Department of Energy Conversion and Storage,Technical University of Denmark,DK-2800 Kgs.Lyngby,Denmark
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