Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 12, Issue 1, Pages 358-365Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ee02351d
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Funding
- Bill and Melinda Gates Foundation (BMGF RTTC Grants) [OPP1111246, OPP1149755]
- Resnick Institute for Sustainability at Caltech
- Office of Science of the U.S. Department of Energy [DE-SC0004993]
- Bill and Melinda Gates Foundation [OPP1149755] Funding Source: Bill and Melinda Gates Foundation
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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 approximate 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 H2SO4 (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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