Oxide‐Supported IrNiOx Core–Shell Particles as Efficient,Cost‐Effective,and Stable Catalysts for Electrochemical Water Splitting |
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| Authors: | Hong Nhan Nong Dr Hyung‐Suk Oh Tobias Reier Dr Elena Willinger Dr Marc‐Georg Willinger Prof Dr Valeri Petkov Dr Detre Teschner Prof Dr Peter Strasser |
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| Institution: | 1. Department of Chemistry, Technical University Berlin, Strasse des 17.Juni 124, TC 03, 10623 Berlin (Germany);2. Department of Inorganic Chemistry, Fritz‐Haber‐Institut der Max‐Planck‐Gesellschaft, Faradayweg 4–6, 14195 Berlin (Germany);3. Department of Physics, Central Michigan University, Mt. Pleasant, MI 48859 (USA) |
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| Abstract: | Active and highly stable oxide‐supported IrNiOx core–shell catalysts for electrochemical water splitting are presented. IrNix@IrOx nanoparticles supported on high‐surface‐area mesoporous antimony‐doped tin oxide (IrNiOx /Meso‐ATO) were synthesized from bimetallic IrNix precursor alloys (PA‐IrNix /Meso‐ATO) using electrochemical Ni leaching and concomitant Ir oxidation. Special emphasis was placed on Ni/NiO surface segregation under thermal treatment of the PA‐IrNix /Meso‐ATO as well as on the surface chemical state of the particle/oxide support interface. Combining a wide array of characterization methods, we uncovered the detrimental effect of segregated NiO phases on the water splitting activity of core–shell particles. The core–shell IrNiOx /Meso‐ATO catalyst displayed high water‐splitting activity and unprecedented stability in acidic electrolyte providing substantial progress in the development of PEM electrolyzer anode catalysts with drastically reduced Ir loading and significantly enhanced durability. |
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| Keywords: | core– shell nanoparticles oxide supports oxygen evolution reaction water splitting X‐ray photoelectron spectroscopy |
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