锚定在Te、N共掺杂MXene的Cu单原子非水溶剂锂空气电池正极制备及其性能研究  

Preparation and performance study of Cu single-atom anchored on Te-N co-doped MXene-based cathode for non-aqueous lithium-air batteries

作　　者：王中华 董臻 吴邦军 王重权 许冠南 刘争 张业龙 WANG Zhong-hua;DONG Zhen;WU Bang-jun;WANG Zhong-quan;HUI Kwun-nam;LIU Zheng;ZHANG Ye-long(School of Applied Physics and Materials,Wuyi University,Jiangmen 529020,China;Institute of Applied Physics and Materials Engineering,University of Macao,Macao SAR 999078,China)

机构地区：[1]五邑大学应用物理与材料学院,广东江门529020 [2]澳门大学应用物理及材料工程研究院,中国澳门999078

出　　处：《现代化工》2024年第12期110-115,共6页Modern Chemical Industry

基　　金：国家自然科学基金青年基金(22005223);五邑大学港澳联合研发基金(2019WGALH10);广东普通高校创新团队资助项目(2017KCXTD031)。

摘　　要：正极缓慢的氧还原/析氧反应动力学限制了锂空气电池(LABs)的实际应用。开发了Te、N共掺杂MXene锚定单原子Cu(Cu_(SA)-Te/N-MXene)用于LABs的正极催化剂。分散的少层MXene纳米片增大了存储放电产物所需的空间,分散的Cu单原子可以有效催化放电产物的形成和分解,从而大大提高氧化还原动力学。结果表明,Cu_(SA)-Te/N-MXene正极表现出超高放电容量(500 mA/g电流密度下放电容量达到16694 mAh/g)、较低的充电过电压(限定容量为1000 mAh/g,500 mA/g电流密度下充电过电压为0.48 V)和出色的循环稳定性(500 mA/g电流密度下稳定循环425圈)。The sluggish kinetics of the oxygen reduction/oxygen evolution reactions at the cathode limits the practical application of non-aqueous lithium-air batteries(LABs).Herein,Cu single-atom anchored on Te-N co-doped MXene(Cu_(SA)-Te/N-MXene)is developed as a catalyst for LABs.Dispersed few-layer MXene nanosheets increase the space required for storage of discharging products,while the dispersed Cu single atoms can effectively catalyze the formation and decomposition of discharging products,thereby significantly accelerating the electrochemical kinetics of redox processes.It is indicated that Cu_(SA)-Te/N-MXene cathode shows a discharge capacity as high as 16694 mAh·g^(-1)at a current density of 500 mA·g^(-1),a charge overvoltage as low as 0.48 V at a current density of 500 mA·g^(-1)as well as a limited capacity of 1000 mAh·g^(-1),and an excellent cycling stability that represents 425 stable cycles at a current density of 500 mA·g^(-1).

关 键 词：锂空气电池 Cu单原子 碲掺杂 氮掺杂 

分 类 号：TM911.41[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]