锂氧电池Ti_(2)CT_(x)MXene基催化剂的表面调控  

Surface regulation of Ti_(2)CT_(x)MXene based catalysts for lithium-oxygen batteries

作　　者：宋世栋[1] 殷芳芳 付月 赵宁波 SONG Shidong;YIN Fangfang;FU Yue;ZHAO Ningbo(School of Chemical Engineering and Technology,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学化学工程与技术学院,天津300387

出　　处：《天津工业大学学报》2024年第2期49-54,共6页Journal of Tiangong University

基　　金：国家自然科学基金面上资助项目(21878232);天津市应用基础与前沿技术研究计划面上资助项目(19JCYBJC21500)。

摘　　要：为了提高二维材料Ti_(2)CT_(x)MXene的催化活性,通过碱处理和热处理等表面处理技术对MXene进行调控,扩大MXene层间距,减少电化学活性差的-F端基,形成以丰富-O端基构成的t-Ti_(2)CT_(x)材料,并将其用作锂氧电池氧电极催化剂,研究其对电池性能的影响。结果表明:在100 mA/g电流密度下,t-Ti_(2)CT_(x)锂氧电池放电比容量为13150.2 mA·h/g,放电/充电过电位为0.17/0.65 V,均优于未处理的Ti_(2)CT_(x)电池性能。在电流密度为1000 mA/g、限容为500 mA·h/g条件下,t-Ti_(2)CT_(x)电池可稳定循环125次;限容1000 mA·h/g时可循环105次,且循环过程中放电电压均高于2.5 V,由此说明t-Ti_(2)CT_(x)锂氧电池实现了较好的电化学性能。In order to improve the catalytic activity of 2D material Ti_(2)CT_(x)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-Ti_(2)CT_(x)material with rich-O terminal group was formed.The t-Ti_(2)CT_(x)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-Ti_(2)CT_(x)LOB delivers the discharge capacity of 13150.2 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 Ti_(2)CT_(x)MXene LOB.When the current density is 1000 mA/g,the t-Ti_(2)CT_(x)LOB can stably cycle 125 times under a capacity limit of 500 mA·h/g and 105 times under 1000 mA·h/g,and during the cycling process,the discharge voltage is above 2.5 V.It illustrates that the t-Ti_(2)CT_(x)LOB achieves good electrochemical performance.

关 键 词：锂氧电池(LOB) Ti_(2)CT_(x) MXene 表面调控 催化活性 电化学性能 

分 类 号：TQ152[化学工程—电化学工业] TM911.3[电气工程—电力电子与电力传动]