氮掺杂的类石墨烯纳米片的制备及其在锌-空气电池中的应用  

Easy Preparation of N⁃Doped Graphene⁃like Nanosheets as Excellent Metal⁃Free Cathodic Electrocatalysts of Zn⁃Air Battery

作　　者：杨孝昆 陈阿玲 易清风[1,2] YANG Xiao-Kun;CHEN A-Ling;YI Qing-Feng(School of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China;Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and Conversion,Xiangtan,Hunan 411201,China)

机构地区：[1]湖南科技大学化学化工学院,湘潭411201 [2]新能源储存与转换先进材料湖南省重点实验室,湘潭411201

出　　处：《无机化学学报》2021年第1期157-170,共14页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21875062,21376070);湖南省重点领域研发计划项目(No.2019GK2034)资助。

摘　　要：采用一种简单方法制备具有优异氧还原反应(ORR)活性的、无金属的氮掺杂碳材料。以双氰胺(DCD)为氮源,蔗糖、β-环糊精和壳聚糖为不同的碳源,通过简单的热解法制备出氮掺杂的类石墨烯纳米片催化剂CN-nanosh(suc)、CN-nanosh(cyc)和CNnanosh(ch)。这些催化剂在碱性溶液中表现出优异的ORR活性,以CN-nanosh(suc)为阴极催化剂的锌-空气电池具有201.33 mW·cm^-2的最大功率密度,在100 mA·cm^-2的大电流密度下能持续放电50多小时,电池性能接近目前报道的无金属阴极催化剂锌-空气电池的最好性能。Carbon-based materials have been paid much attention due to their own good electroactivity and resources availability.Herein,we reported a simple and versatile synthesis strategy for the preparation of nitrogen-doped and metal-free carbon catalysts with excellent oxygen reduction reaction(ORR)electroactivity.Using dicyandiamide(DCD)as nitrogen source and sucrose,β-cyclodextrin and chitosan as different carbon sources,N-doped graphene-like nanosheet samples CN-nanosh(suc),CN-nanosh(cyc)and CN-nanosh(ch)were prepared by an easy pyrolysis of their mixture.The samples exhibited outstanding ORR electroactivity in alkaline media with a comparable performance to the benchmark Pt/C.Alkaline Zn-air battery with the prepared sample CN-nanosh(suc)as the cathodic catalyst displayed the maximum power density of 201.33 mW·cm^-2,and its discharge time can last for more than 50 h at a constant current density of 100 mA·cm^-2,which is close to the optimum values of the similar Zn-air battery with the metal-free cathodic electrocatalysts reported so far.

关 键 词：氧还原反应 锌-空气电池 电化学 能量转化 纳米颗粒 

分 类 号：O611.4[理学—无机化学]