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Oxide‐Supported IrNiO x Core–Shell Particles as Efficient, Cost‐Effective, and Stable Catalysts for Electrochemical Water Splitting
Author(s) -
g Hong Nhan,
Oh HyungSuk,
Reier Tobias,
Willinger Elena,
Willinger MarcGeorg,
Petkov Valeri,
Teschner Detre,
Strasser Peter
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201411072
Subject(s) - bimetallic strip , materials science , catalysis , tin oxide , electrochemistry , oxide , water splitting , non blocking i/o , chemical engineering , nanoparticle , electrolyte , inorganic chemistry , mesoporous material , anode , electrolysis of water , electrolysis , nanotechnology , chemistry , electrode , photocatalysis , metallurgy , metal , biochemistry , engineering
Active and highly stable oxide‐supported IrNiO x core–shell catalysts for electrochemical water splitting are presented. IrNi x @IrO x nanoparticles supported on high‐surface‐area mesoporous antimony‐doped tin oxide (IrNiO x /Meso‐ATO) were synthesized from bimetallic IrNi x precursor alloys (PA‐IrNi x /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‐IrNi x /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 IrNiO x /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.