Activity and Stability of Electrochemically and Thermally Treated Iridium for the Oxygen Evolution Reaction

Abstract

Iridium is the main element in modern catalysts for the oxygen evolution reaction (OER) in proton exchange membrane water electrolyzers (PEMWE), which is predominantly due to its relatively good activity and tolerable stability in harsh PEMWE conditions. Limited abundance of iridium, however, poses limitations on widespread applications of these devices, in particular in the large scale conversion and storage of renewable energy. In this work if the electrocatalytic performance of iridium can be fine-tuned by thermal treatment of catalysts at different temps. is investigated. The OER activity and the dissoln. of two different iridium electrodes, viz. flat metallic iridium surfaces prepd. by electron beam phys. vapor deposition (EBPVD) and electrochem. prepd. porous hydrous iridium oxide films (HIROF) are studied. The range of applied annealing temps. is 100-600°, with a general trend of decreasing activity and increasing stability the higher the temp. Numerous peculiarities in the trend are however obsd. These are discussed considering variations of oxide structure, morphol. and electronic cond. [on SciFinder(R)]