Science· 2016Q1
A highly active and stable IrO <i> <sub>x</sub> </i> /SrIrO <sub>3</sub> catalyst for the oxygen evolution reaction
- 2,170citations
- Q1SCImago
- 2016year
Short summary
A new IrO x /SrIrO 3 catalyst, formed by strontium leaching from SrIrO 3 thin films, achieves high activity (270-290 mV overpotential at 10 mA/cm 2 ) and stability for 30 hours in acidic electrolyte, outperforming existing IrO x and RuO x catalysts.
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Key points
- A new IrO x /SrIrO 3 catalyst is formed by leaching strontium from SrIrO 3 thin films.
- The catalyst shows high activity, requiring 270-290 mV overpotential at 10 mA/cm 2 for OER.
- It maintains stable performance for 30 hours in acidic electrolyte.
- Theoretical calculations suggest IrO 3 or anatase IrO 2 motifs are responsible for activity.
- This catalyst outperforms existing IrO x and RuO x systems for OER.
AI-generated from the title and abstract; the full text is not read.
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 (IrO x /SrIrO 3 ) catalyst formed during electrochemical testing by strontium leaching from surface layers of thin films of SrIrO 3 . 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 IrO 3 or anatase IrO 2 motifs. The IrO x /SrIrO 3 catalyst outperforms known IrO x and ruthenium oxide (RuO x ) systems, the only other OER catalysts that have reasonable activity in acidic electrolyte.
The authors' abstract, as published at the source. Science, 2016 · DOI ↗
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Field: Renewable Energy, Sustainability and the Environment
Renewable Energy, Sustainability and the EnvironmentEnergy