Enhancing the activity of oxygen-evolution and chlorine-evolution electrocatalysts by atomic layer deposition of TiO(2)†

We report that TiO(2) coatings formed via atomic layer deposition (ALD) may tune the activity of IrO(2), RuO(2), and FTO for the oxygen-evolution and chlorine-evolution reactions (OER and CER). Electrocatalysts exposed to ~3–30 ALD cycles of TiO(2) exhibited overpotentials at 10 mA cm(–2) of geometr...

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Detalles Bibliográficos
Autores principales: Finke, Cody E., Omelchenko, Stefan T., Jasper, Justin T., Lichterman, Michael F., Read, Carlos G., Lewis, Nathan S., Hoffmann, Michael R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Royal Society of Chemistry 2018
Materias:
Paper
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7680952/
https://www.ncbi.nlm.nih.gov/pubmed/33312227
http://dx.doi.org/10.1039/c8ee02351d
Descripción
Sumario:We report that TiO(2) coatings formed via atomic layer deposition (ALD) may tune the activity of IrO(2), RuO(2), and FTO for the oxygen-evolution and chlorine-evolution reactions (OER and CER). Electrocatalysts exposed to ~3–30 ALD cycles of TiO(2) exhibited overpotentials at 10 mA cm(–2) of geometric current density that were several hundred millivolts lower than uncoated catalysts, with correspondingly higher specific activities. For example, the deposition of TiO(2) onto IrO(2) yielded a 9-fold increase in the OER-specific activity in 1.0 M H(2)SO(4) (0.1 to 0.9 mA cm(ECSA)(–2) at 350 mV overpotential). The oxidation state of titanium and the potential of zero charge were also a function of the number of ALD cycles, indicating a correlation between oxidation state, potential of zero charge, and activity of the tuned electrocatalysts.

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