Surface regulation of Ti2CTx MXene based catalysts for lithium-oxygen batteries
In order to improve the catalytic activity of 2D material Ti2CTx MXene,MXene was regulated by the surface treatment technology such as alkali treatment and heat treatment,the spacing of MXene layers was enlarged,the-F terminal group with poor electrochemical activity was reduced,and the t-Ti2CTx material with rich-O terminal group was formed.The t-Ti2CTx material was used as an oxygen electrode for lithium-oxygen batteries(LOB)to study its impact on battery performance.The results show that the t-Ti2CT,LOB delivers the discharge capacity of 13 150.2 mA·h/g at 100 mA/g,achieves over potentials of 0.17/0.65 V for discharge/charge process which is superior to the performance of untreated Ti2CTx MXene LOB.When the current density is 1 000 mA/g,the t-Ti2CTx LOB can stably cycle 125 times under a capacity limit of 500 mA·h/g and 105 times under 1 000 mA·h/g,and during the cycling process,the discharge voltage is above 2.5 V.It illustrates that the t-Ti2CTxLOB achieves good electrochemical performance.
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