期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 6, 页码 2257-2261出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201508338
关键词
hydrophobicity; ionic liquids; nonreactive oxygenated species; oxygen reduction; supported catalysts
资金
- German Research Council (DFG) within the Excellence Cluster Engineering of Advanced Materials in the framework of the excellence initiative
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 1.01Amg(Pt)(-1)@0.9V, representing a new record for pure Pt catalysts. The enhanced performance of the IL-modified catalyst can be stabilized after 30000 cycles. We anticipate these results will form the basis for an unprecedented perspective in the development of high-performing electrocatalysts for fuel-cell applications.
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