以柠檬酸和组氨酸为碳源构筑了组氨酸功能化石墨烯量子点@氧化镍（His-GQD@NiO）复合材料。利用X射线衍射仪（XRD）、X射线光电子能谱仪（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）以及恒流充放电仪等对复合材料的结构、形貌和电化学性能进行表征与分析。结果表明，该复合材料表现出优异的电化学性能，在电流密度为1 A/g时，比电容达到542 F/g，并且具有良好的循环稳定性（5 000次循环后电容保持率为94.8%）。良好的电化学性能归因于材料优异的导电性、结构的稳定性以及高效的电解液传输通道。

A new histidine-functionalized graphene quantum dot@NiO composite (His-GQD@NiO) is constructed with citric acid and histidine as carbon source.Structures, morphology and electrochemical properties of the composite are characterized and measured via XRD, XPS, SEM, TEM and galvanostatic charge-discharge.The influence of the structure of the composite on its electrochemical performance is also investigated.Test results show that His-GQD@NiO composite presents excellent electrochemical properties.Its specific capacitance reaches 542 F·g^-1 at a current density of 1 A·g^-1.It exhibits a good cycle stability with a capacity retention of 94.8% after 5 000 cycles.Good electrochemical property may be attributed to its excellent conductivity, structural stability and efficient electrolyte transmission channel.

王丽(1983-),女,本科,实验员,研究方向为实验管理,2859103838@qq.com。李涛(1982-),男,博士,副教授,主要从事多孔有机聚合物的设计及性能研究,2012020003@bzuu.edu.cn。