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Science. 2016 Sep 2;353(6303):1011-1014.

A highly active and stable IrOx/SrIrO3 catalyst for the oxygen evolution reaction.

Author information

  • 1SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Shriram Center, 443 Via Ortega, Stanford, CA 94305, USA.
  • 2SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Shriram Center, 443 Via Ortega, Stanford, CA 94305, USA. SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
  • 3Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA. Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, 476 Lomita Mall, Stanford, CA 94305, USA.
  • 4Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
  • 5SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
  • 6SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Shriram Center, 443 Via Ortega, Stanford, CA 94305, USA. SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA. jaramillo@stanford.edu.

Abstract

Oxygen electrochemistry plays a key role in renewable energy technologies such as fuel cells and electrolyzers, but the slow kinetics of the oxygen evolution reaction (OER) limit the performance and commercialization of such devices. Here we report an iridium oxide/strontium iridium oxide (IrOx/SrIrO3) catalyst formed during electrochemical testing by strontium leaching from surface layers of thin films of SrIrO3 This catalyst has demonstrated specific activity at 10 milliamps per square centimeter of oxide catalyst (OER current normalized to catalyst surface area), with only 270 to 290 millivolts of overpotential for 30 hours of continuous testing in acidic electrolyte. Density functional theory calculations suggest the formation of highly active surface layers during strontium leaching with IrO3 or anatase IrO2 motifs. The IrOx/SrIrO3 catalyst outperforms known IrOx and ruthenium oxide (RuOx) systems, the only other OER catalysts that have reasonable activity in acidic electrolyte.

PMID:
27701108
DOI:
10.1126/science.aaf5050
[PubMed - in process]
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