Abstract
In this work,a new ZnO/CoNiO2/CoO/C metal oxides composite is prepared by cost-effective hydro-thermal method coupled with annealing process under N2 atmosphere.Notably,the oxidation-defect annealing environment is conducive to both morphology and component of the composite,which flower-like ZnO/CoNiC2/CoO/C is obtained.Benefited from good chemical stability of ZnO,high energy capacity of CoNiO2 and CoO and good conductivity of C,the as-prepared sample shows promising electrochemical behavior,including the specific capacity of 1435 C·g-1 at 1 A·g-1,capacity retention of 87.3％at 20 A·g-1,and cycling stability of 90.5％for 3000 cycles at 5 A·g-1,respectively.Furthermore,the prepared ZnO/CoNiO2/CoO/C/NF//AC aqueous hybrid supercapacitors device delivers the best specific energy of 55.9 W·h·kg-1 at 850 W kg-1.The results reflect that the as-prepared ZnO/CoNiO2/CoO/C microflowers are considered as high performance electrode materials for supercapacitor,and the strategy mentioned in this paper is benefit to prepare mixed metal oxides composite for energy con-version and storage.
基金项目
国家自然科学基金(22078215)
Research Project by Shanxi Scholarship Council of China(2021-055)
万方数据