首页|An effective strategy of constructing multi-metallic oxides of ZnO/CoNiO2/CoO/C microflowers for improved supercapacitive performance
An effective strategy of constructing multi-metallic oxides of ZnO/CoNiO2/CoO/C microflowers for improved supercapacitive performance
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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.
CompositesElectrochemistryHydrothermalTransition metal oxidesStructural controlSupercapacitors
Wei Guo、Yan Zhang、Xiaxin Lei、Shuang Wang
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College of Physics,Taiyuan University of Technology,Jinzhong 030600,China
College of Environmental Science and Engineering,Taiyuan University of Technology,Jinzhong 030600,China
Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization,Taiyuan University of Technology,Taiyuan 030024,China
国家自然科学基金Research Project by Shanxi Scholarship Council of China
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