Electrocatalytic Oxygen Evolution on Iridium Oxide: Uncovering Catalyst-Substrate Interactions and Active Iridium Oxide Species | Zendy

Tobias Reier | Zendy; D. Teschner | Zendy; Thomas Lunkenbein | Zendy; Arno Bergmann | Zendy; Sören Selve | Zendy; Ralph Kraehnert | Zendy; R. Schlögl | Zendy; Peter Strasser | Zendy

Open Access

Electrocatalytic Oxygen Evolution on Iridium Oxide: Uncovering Catalyst-Substrate Interactions and Active Iridium Oxide Species

Author(s) -

Tobias Reier,

D. Teschner,

Thomas Lunkenbein,

Arno Bergmann,

Sören Selve,

Ralph Kraehnert,

R. Schlögl,

Peter Strasser

Publication year - 2014

Publication title -

journal of the electrochemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.258

H-Index - 271

eISSN - 1945-7111

pISSN - 0013-4651

DOI - 10.1149/2.0411409jes

Subject(s) - calcination , oxide , x ray photoelectron spectroscopy , cyclic voltammetry , materials science , iridium , amorphous solid , catalysis , substrate (aquarium) , scanning electron microscope , oxygen evolution , chemical engineering , inorganic chemistry , crystallinity , chemistry , electrochemistry , crystallography , metallurgy , organic chemistry , electrode , engineering , oceanography , composite material , geology

The morphology, crystallinity, and chemical state of well-defined Ir oxide nanoscale thin-film catalysts prepared on Ti substrates at various calcination temperatures were investigated. Special emphasis was placed on the calcination temperature-dependent interaction between Ir oxide film and Ti substrate and its impact on the electrocatalytic oxygen evolution reaction (OER) activity. The Ir oxide films were characterized by scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and cyclic voltammetry. Furthermore, temperature programmed reduction was applied to study the Ir oxide species formed as a function of calcination temperature and its interaction with the Ti substrate. A previously unachieved correlation between the electrocatalytic OER activity and the nature and structural properties of the Ir oxide film was established. We find that the crystalline high temperature Ir oxide species is detrimental, whereas low temperature amorphous Ir oxy-hydroxides are highly active and efficient catalysts for the OER. Moreover, at the highest applied calcination temperature (550°C), Ti oxides, originating from the substrate, strongly affect chemical state and electrocatalytic OER activity of the Ir oxide film

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