尖晶石型锂钴氧化物作为一种用于析氧反应和氧还原反应的双功能电催化剂。
Spinel-type lithium cobalt oxide as a bifunctional electrocatalyst for the oxygen evolution and oxygen reduction reactions.
机构信息
Materials Science and Engineering Program, The University of Texas at Austin, Austin, Texas 78712, USA.
出版信息
Nat Commun. 2014 May 27;5:3949. doi: 10.1038/ncomms4949.
Development of efficient, affordable electrocatalysts for the oxygen evolution reaction and the oxygen reduction reaction is critical for rechargeable metal-air batteries. Here we present lithium cobalt oxide, synthesized at 400 °C (designated as LT-LiCoO2) that adopts a lithiated spinel structure, as an inexpensive, efficient electrocatalyst for the oxygen evolution reaction. The catalytic activity of LT-LiCoO2 is higher than that of both spinel cobalt oxide and layered lithium cobalt oxide synthesized at 800 °C (designated as HT-LiCoO2) for the oxygen evolution reaction. Although LT-LiCoO2 exhibits poor activity for the oxygen reduction reaction, the chemically delithiated LT-Li1-xCoO2 samples exhibit a combination of high oxygen reduction reaction and oxygen evolution reaction activities, making the spinel-type LT-Li0,5CoO2 a potential bifunctional electrocatalyst for rechargeable metal-air batteries. The high activities of these delithiated compositions are attributed to the Co4O4 cubane subunits and a pinning of the Co(3+/4+):3d energy with the top of the O(2-):2p band.
开发高效、经济的电催化剂对于可充电金属空气电池的氧析出反应（oxygen evolution reaction）和氧还原反应（oxygen reduction reaction）至关重要。在这里，我们提出了一种在 400°C 下合成的氧化锂钴（lithium cobalt oxide），即 LT-LiCoO2，它采用了锂化尖晶石结构，是一种廉价、高效的氧析出反应电催化剂。LT-LiCoO2 的催化活性高于在 800°C 下合成的尖晶石氧化钴（spinel cobalt oxide）和层状氧化锂钴（layered lithium cobalt oxide），即 HT-LiCoO2，用于氧析出反应。虽然 LT-LiCoO2 对氧还原反应的活性较差，但化学脱锂的 LT-Li1-xCoO2 样品表现出高的氧还原反应和氧析出反应活性的结合，使尖晶石型 LT-Li0,5CoO2 成为可充电金属空气电池的潜在双功能电催化剂。这些脱锂组合物的高活性归因于 Co4O4 立方烷亚基和 Co(3+/4+):3d 能与 O(2-):2p 带的顶端的固定。
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