Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The oxygen evolution reaction (OER) is an important half-cell reaction in many processes such as chlorine evolution, water splitting and CO2 reduction. In the latter two it is part of a promising solution to the intermittent availability of renewable energies. One pathway for this solution is the employement of PEM-based electrolyzers that allow a wide operational load range and good dynamic load behaviour. Nonetheless, in order to apply the technology to larger scales the overall water splitting efficiency has to be improved.However, in the harsh conditions of acidic water splitting there exist very few stable materials. IrO2 and RuO2, being the only examples with good activity for the OER, unfortunately show unsatisfactory stability for commercial application and have very low abundancies.[1]
While being investigated for quite some time, research has been largely focused on increasing activity of less expensive materials or elucidating the OER mechanism.[2,3] Only recently more groups have started characterizing and attempting to improve the stability of OER catalysts with decreased noble metal content.[4,5] In order to better understand the relationship of catalyst stability to the physical and electronic structure under reaction conditions the corrosion mechanism in acidic water splitting has to be investigated. New in-situ techniques can help in fundamental studies on the active state of the catalysts.
Our study reveals binary iridium based mixed metal oxides with increased long-term stability while maintaining comparable activity to pure iridium oxide. Controlling the catalyst structure by synthesis parameters and altering the electrocatalytic behavior by introducing a second metal allows the design of new catalysts properties.
Literature:
[1] Dau, H., et al., ChemCatChem 2010, 2, 724.
[2] McCrory, C. C. L., et al., J Am Chem Soc 2013, 135, 16977.
[3] Reier, T. et al., J Electrochem Soc 2014, 161, F876.
[4] Cherevko, S. et al., Electrochem Commun 2014, 48, 81.
[5] Chang, S. H. et al., Faraday Discuss 2014, 176, 125.
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