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

Autor: Finke CE; The Linde Center for Global Environmental Science, Caltech, Caltech, Pasadena, CA 91125, USA.; The Resnick Sustainability Institute, Caltech, Caltech, Pasadena, CA 91125, USA.; Division of Engineering and Applied Science, Caltech, Caltech, Pasadena, CA 91125, USA., Omelchenko ST; Division of Engineering and Applied Science, Caltech, Caltech, Pasadena, CA 91125, USA., Jasper JT; The Linde Center for Global Environmental Science, Caltech, Caltech, Pasadena, CA 91125, USA.; The Resnick Sustainability Institute, Caltech, Caltech, Pasadena, CA 91125, USA.; Division of Engineering and Applied Science, Caltech, Caltech, Pasadena, CA 91125, USA., Lichterman MF; The Linde Center for Global Environmental Science, Caltech, Caltech, Pasadena, CA 91125, USA., Read CG; The Resnick Sustainability Institute, Caltech, Caltech, Pasadena, CA 91125, USA.; Division of Chemistry and Chemical Engineering, Caltech, Caltech, Pasadena, CA 91125, USA., Lewis NS; Division of Chemistry and Chemical Engineering, Caltech, Caltech, Pasadena, CA 91125, USA., Hoffmann MR; The Linde Center for Global Environmental Science, Caltech, Caltech, Pasadena, CA 91125, USA.; The Resnick Sustainability Institute, Caltech, Caltech, Pasadena, CA 91125, USA.; Division of Engineering and Applied Science, Caltech, Caltech, Pasadena, CA 91125, USA.
Jazyk: angličtina
Zdroj: Energy & environmental science [Energy Environ Sci] 2019; Vol. 12, pp. 358-365. Date of Electronic Publication: 2018 Dec 14.
DOI: 10.1039/c8ee02351d
Abstrakt: 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.
Competing Interests: The authors’ institution (California Institute of Technology) has filed a U.S. patent application directly relating to the work described in the paper (patent application no. US20180087164A1, filed on Sept. 28, 2017).
(© 2019 The Royal Society of Chemistry 2019.)
Databáze: MEDLINE
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