Enhancing the activity of oxygen-evolution and chlorine-evolution electrocatalysts by atomic layer deposition of TiO2. Issue 1 (14th December 2018)

• Record Type: Journal Article
• Authors: Finke, Cody E.; Omelchenko, Stefan T.; Jasper, Justin T.; Lichterman, Michael F.; Read, Carlos G.; Lewis, Nathan S.; Hoffmann, Michael R.
• Is Part Of: Energy & environmental science. Volume 12:Issue 1(2019)
• Page Start: 358
• Page End: 365
• Publication Date: 2018-12-14
• Subjects: Energy conversion -- Periodicals; Fuel switching -- Periodicals; Environmental sciences -- Periodicals; Environmental chemistry -- Periodicals; 333.79
• DOI: 10.1039/c8ee02351d
• Languages: English
• ISSNs: 1754-5692

Abstract

Abstract : Atomic layer deposition of TiO2 may be used to tune the catalytic activity of three metal oxide catalysts for two reactions. Abstract : We report that TiO2 coatings formed via atomic layer deposition (ALD) may tune the activity of IrO2, RuO2, and FTO for the oxygen-evolution and chlorine-evolution reactions (OER and CER). Electrocatalysts exposed to ∼3–30 ALD cycles of TiO2 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 TiO2 onto IrO2 yielded a 9-fold increase in the OER-specific activity in 1.0 M H2 SO4 (0.1 to 0.9 mA cmECSA −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.