Spinel-type lithium cobalt oxide as a bifunctional electrocatalyst for the oxygen evolution and oxygen reduction reactions
Spinel-type lithium cobalt oxide as a bifunctional electrocatalyst for the oxygen evolution and oxygen reduction reactions
复制标题
DOI：
10.1038/ncomms4949
复制
发表时间：
2014-05-01
影响因子：
16.6
通讯作者：
Manthiram, Arumugam
中科院分区：
文献类型：
--
作者：
Maiyalagan, Thandavarayan;Jarvis, Karalee A.;Manthiram, Arumugam
开发用于析氧反应和氧还原反应的高效、可负担得起的电催化剂对于可再充电金属-空气电池至关重要。在这里，我们提出了锂钴氧化物，在400摄氏度合成（指定为LT-LiCoO 2），采用锂化尖晶石结构，作为一种廉价，有效的析氧反应的电催化剂。对于析氧反应，LT-LiCoO 2的催化活性高于在800 ℃下合成的尖晶石钴氧化物和层状锂钴氧化物（命名为HT-LiCoO 2）的催化活性。虽然LT-LiCoO 2表现出较差的氧还原反应活性，但化学脱锂的LT-Li 1-xCoO 2样品表现出高的氧还原反应和析氧反应活性的组合，使得尖晶石型LTLi 0，5CoO 2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Co 4 O 4立方烷亚基和Co 3 +/4+：3d能量与O2-：2 p带顶部的钉扎。
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 degrees 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 degrees 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 LTLi0,5CoO2 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 Co3+/4+:3d energy with the top of the O2-:2p band.