期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 838, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.155556
关键词
Electrode materials; Liquid-solid reactions; Electrochemical reactions; Asymmetric supercapacitors; Hierarchical nanostructures
资金
- Jilin Provincial Science and Technology Development Foundation [20180201011GX]
- China Scholarship Council (CSC) State Scholarship Fund International Clean Energy Talent Project [[2019]157]
Most pseudocapacitor materials have only near-surface parts participated into the Faradic-reaction, and their low contribution limits the development of pseudocapacitors. In this situation, hierarchical alpha-Co(OH)(2)-coated ultra-thin ZnO flower nanostructures on nickel foam (NF@ZnO@Co(OH)(2)) are designed and constructed to enhance the efficiency of charge and ion-transfer process as well as to improve the low contribution of pseudoactive materials during the Faradic-reaction. The ultra-thin petal ZnO flowerlike nanostructures can take the role of the effective backbones for succeeding synthesis of electrochemical active materials. The optimized electrodes exhibited an outstanding pseudocapacitive performance, including an excellent durability, wide working potential window (0.55 V in galvanostatic charge-discharge measurement) and a high specific capacitance of 2396.4 F g(-1). Additionally, we have constructed an asymmetric supercapacitor device and it delivers a prominent energy density of 62.57Wh kg(-1) at a power density of 711.28Wkg(-1) with a cell voltage of 1.5 V and an excellent durability. Thereby, the NF@ZnO@ Co(OH)(2) is one promising supercapacitors electrode material for practical application. (C) 2020 Elsevier B.V. All rights reserved.
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