The key factor to improve the electrochemical performance of Li-O2 batteries is to find effective cathode catalysts to promote the oxygen reduction and oxygen evolution reactions. Herein, we report the synthesis of an effective cathode catalyst of ruthenium nanocrystals supported on carbon black substrate by a surfactant assisting method. The as-prepared ruthenium nanocrystals exhibited an excellent catalytic activity as cathodes in Li-O2 batteries with a high reversible capacity of about 9,800 mAh g−1, a low charge-discharge over-potential (about 0.37 V), and an outstanding cycle performance up to 150 cycles (with a curtaining capacity of 1,000 mAh g−1). The electrochemical testing shows that ruthenium nanocrystals can significantly reduce the charge potential comparing to carbon black catalysts, which demonstrated that ruthenium based nanomaterials could be effective cathode catalysts for high performance lithium- O2 batteries.
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机译：改善Li-O2电池电化学性能的关键因素是寻找有效的阴极催化剂以促进氧还原和氧释放反应。在本文中，我们报道了通过表面活性剂辅助方法合成的负载在炭黑基质上的钌纳米晶体的有效阴极催化剂。所制备的钌纳米晶体在Li-O2电池中具有优异的催化活性，可逆容量约为9,800 mAh g -1 ，低的充放电过电位（约0.37 V） ）和高达150个循环的出色循环性能（帘幕容量为1,000 mAh g -1 ）。电化学测试表明，与炭黑催化剂相比，钌纳米晶体可以显着降低充电电位，这表明钌基纳米材料可以作为高性能锂O2电池的有效阴极催化剂。
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