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- Title
Accelerating Oxygen-Reduction Catalysts through Preventing Poisoning with Non-Reactive Species by Using Hydrophobic Ionic Liquids.
- Authors
Zhang, Gui-Rong; Munoz, Macarena; Etzold, Bastian J. M.
- Abstract
Developing cost-effective electrocatalysts for the oxygen reduction reaction (ORR) is a prerequisite for broad market penetration of low-temperature fuel cells. A major barrier stems from the poisoning of surface sites by nonreactive oxygenated species and the sluggish ORR kinetics on the Pt catalysts. Herein we report a facile approach to accelerating ORR kinetics by using a hydrophobic ionic liquid (IL), which protects Pt sites from surface oxidation, making the IL-modified Pt intrinsically more active than its unmodified counterpart. The mass activity of the catalyst is increased by three times to 1.01 A mg−1Pt@0.9 V, representing a new record for pure Pt catalysts. The enhanced performance of the IL-modified catalyst can be stabilized after 30 000 cycles. We anticipate these results will form the basis for an unprecedented perspective in the development of high-performing electrocatalysts for fuel-cell applications.
- Subjects
OXYGEN reduction; ELECTROCATALYSTS; PLATINUM catalysts; IONIC liquids; HYDROPHOBIC interactions
- Publication
Angewandte Chemie International Edition, 2016, Vol 55, Issue 6, p2257
- ISSN
1433-7851
- Publication type
Article
- DOI
10.1002/anie.201508338