Premium
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 international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201411072
Subject(s) - bimetallic strip , materials science , electrochemistry , tin oxide , catalysis , oxide , non blocking i/o , water splitting , chemical engineering , electrolyte , nanoparticle , mesoporous material , anode , inorganic chemistry , nanotechnology , chemistry , electrode , metallurgy , metal , photocatalysis , 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.