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Zhang, Gui-Rong; Munoz, Macarena; Etzold, Bastian J. M.
Angewandte Chemie (International ed.), February 5, 2016, Letnik: 55, Številka: 6Journal Article
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. Keep my place: A hydrophobic ionic liquid phase helps protect the Pt sites from being poisoned by nonreactive oxygenated species, leading to dramatically improved kinetics of the oxygen reduction reaction (ORR) on platinum catalyst.
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