Co_(x)N@C超级电容器材料的制备及其电化学性能  

Synthesis and electrochemical property of Co_(x)N@C supercapacitor materials

作　　者：张旭磊 李宏 张鸣清 底兰波[1] 张秀玲[1] ZHANG Xulei;LI Hong;ZHANG Mingqing;DI Lanbo;ZHANG Xiuling(College of Physical Science and Technology, Dalian University, Dalian 116622, China)

机构地区：[1]大连大学物理科学与技术学院,辽宁大连116622

出　　处：《功能材料》2022年第7期7182-7188,共7页Journal of Functional Materials

基　　金：国家自然科学基金项目(52077024,12005031)。

摘　　要：钴的氮化物因具有良好的导电性和热稳定性在储能方面极具应用潜力。为制备高性能Co氮化物超级电容器电极材料,采用液相沉积法制备的Co-MFF(钴甲酸骨架材料)为前体,氨氩混合气氛热解Co-MFF制备Co_(x)N@C,研究了热解气氛和温度对制备的Co_(x)N@C结构和电化学性能的影响。结果表明,Co-MFF经过氨热解得到了含有CoN和Co_(4)N混晶相以及N掺杂非晶态碳的Co_(x)N@C复合材料,且改变热解条件可使Co_(x)N@C的孔道结构丰富。当热解气氛中氨气含量为10%和焙烧温度为450℃时所得的Co_(x)N@C在1 A/g电流密度下具有208.5 F/g的高比容量,且在10 A/g的电流密度下,其比电容仍然能够达到171.4 F/g,表现出较好的倍率性能。经1000次循环充放电后比电容依然保持100%,循环稳定性良好。上述研究为钴的氮化物超级电容器电极材料提供了新的制备途径。Cobalt nitrides have great potential in energy storage due to their excellent electrical conductivity and thermal stability.To prepare high-performance cobalt nitride supercapacitor materials,Co-MFF(cobalt formic acid framework material)obtained by liquid phase deposition method was adopted as Co precursor,and Co_(x)N@C was prepared by pyrolysis of the Co-MFF in ammonia and argon mixing atmosphere.The effects of pyrolysis atmosphere and temperature on the structure and electrical properties of Co_(x)N@C were studied.The results show that Co_(x)N@C consists of CoN and Co_(4)N in mixed phases and amorphous N-doped carbon,and the pore structure of Co_(x)N@C can be changed by adjusting pyrolysis conditions.When the content of ammonia was 10%and the calcination temperature was 450℃,the specific capacity of Co_(x)N@C was as high as 208.5 and 171.4 F/g at the current density of 1 and 10 A/g,respectively,which reveals good rate capability.Meanwhile,the specific capacitance remains 100%even after 1000 cycles of charge and discharge,suggesting good cycle stability.These results obtained in this work provide a new way for preparing cobalt nitride supercapacitor electrode materials.

关 键 词：Co氮化物 液相沉积法 Co-MFF 氨热解 超级电容器 

分 类 号：TB34[一般工业技术—材料科学与工程]