An efficient bifunctional two-component catalyst for oxygen reduction and oxygen evolution in reversible fuel cells, electrolyzers and rechargeable air electrodes
An efficient bifunctional two-component catalyst for oxygen reduction and oxygen evolution in reversible fuel cells, electrolyzers and rechargeable air electrodes
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DOI：
10.1039/c6ee01046f
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发表时间：
2016-01-01
影响因子：
32.5
通讯作者：
Strasser, Peter
中科院分区：
文献类型：
--
作者：
Dresp, Soeren;Luo, Fang;Strasser, Peter
我们报告了一种非贵重的，两相双功能氧还原和析出（ORR和OER）电催化剂，具有以前未实现的组合往返催化反应性和稳定性，用于单元化可逆燃料电池/电解槽或可充电金属-空气电池的氧电极。在10 mA cm（-2）下，OER和ORR的总过电位为0.747 V，创历史新低。旋转环盘电极（RRDE）测量结果显示，该催化剂对4种电子路径具有高法拉第选择性，而随后在可逆电解槽中进行的连续MEA测试证实，该催化剂的反应性可与最先进的铱（OER）和铂（ORR）组合相媲美。
We report on a non-precious, two-phase bifunctional oxygen reduction and evolution (ORR and OER) electrocatalyst with previously unachieved combined roundtrip catalytic reactivity and stability for use in oxygen electrodes of unitized reversible fuel cell/electrolyzers or rechargeable metal-air batteries. The combined OER and ORR overpotential, total, at 10 mA cm(-2) was a record low value of 0.747 V. Rotating Ring Disk Electrode (RRDE) measurements revealed a high faradaic selectivity for the 4 electron pathways, while subsequent continuous MEA tests in reversible electrolyzer cells confirmed the excellent catalyst reactivity rivaling the state-of-the-art combination of iridium (OER) and platinum (ORR).