Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Water splitting is a critical component of future sustainable energy systems. Photo-electrochemical reactions are strongly limited by the oxygen evolution reaction OER. In acidic environments IrO2 is the presently best electro-catalyst. The scarcity of the metal has caused many strategies for minimizing the active mass in academic electrodes as well as in commercial realizations. As successful as such strategies are, there remains a large incentive to move away from such noble metal systems. In order to create a rational basis for selecting property profiles for possible replacement systems we need to understand the mode of operation of IrO2 in water electrolysis. We detected chemical transformations and dynamical behavior on this nominally stable rutile-type oxide when it was active in water splitting. Using a combination of spectroscopic, microscopic and thermochemical analytical tools we can now state that a defective metal ortho acid is the active form of the nominal IrO2. Several spectroscopic peculiarities may be consistently explained by the presence of oxygen hole states in the active surface. We will discuss still unknown properties of the Ir oxide system and derive implications for the search of alternative materials.
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