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Photocatalysis and electrolysis are crucial processes for the development of a sustainable, clean energy system, since they enable solar fuel production, such as hydrogen by water splitting, as well as CO2 reduction. In these processes efficient and robust catalysts for water oxidation are required and the reduction of employed amount of noble metals is crucial to reduce costs and increase the sustainability of the technology. To obtain extremely low iridium loading on nickel foam electrodes we have employed electroless deposition by spontaneous galvanic displacement as a simple, low cost, highly scalable technique. After deposition the Ir oxidation has been achieved by annealing in air at 250 °C. By varying the deposition parameters, an optimal condition has been achieved, with an overpotential for water oxidation of 360 mV at 10 mA cm−2 in 1.0 M KOH solution. The Ni foam coverage with Ir oxide has also a …
Publication date: 
16 Oct 2020

Rachela G Milazzo, Stefania MS Privitera, Silvia Scalese, Francesca Monforte, Corrado Bongiorno, Guglielmo G Condorelli, Salvatore A Lombardo

Biblio References: 
Volume: 45 Issue: 51 Pages: 26583-26594
International Journal of Hydrogen Energy