Mesoporous, hierarchical core/shell structured ZnCo2O4/MnO2 nanocone forests for high-performance supercapacitors
Mesoporous, hierarchical core/shell structured ZnCo2O4/MnO2 nanocone forests for high-performance supercapacitors
复制标题
用于高性能超级电容器的介孔、分层核/壳结构ZnCo2O4/MnO2纳米锥森林
DOI：
10.1016/j.nanoen.2014.11.063
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发表时间：
2015-01-01
期刊：
影响因子：
17.6
通讯作者：
Luo, Yongsong
中科院分区：
文献类型：
--
作者：
Qiu, Kangwen;Lu, Yang;Luo, Yongsong
采用水热法在3D泡沫镍上制备了ZnCo 2 O 4/MnO 2纳米锥森林，该纳米锥森林具有介孔、分级核壳结构和较大的比表面积。由该独特结构制备的超级电容器电极在1和10 A g（-1）的电流密度下分别表现出2339和1526 F g（-1）的优异比电容，并且在2 A下3000次循环后的长期容量保持率类似于95.9%，在10 A g（-1）下8000次循环后的长期容量保持率类似于94.5%。这些值被证明是最高的电容之间进行比较时，本研究和类似的核/壳结构的金属氧化物电极从文献中。许多协同效应被确定为负责的观察：即，高导电性的3D镍泡沫基板，完全消除粘合剂和导电添加剂;高结晶质量的ZnCo 2 O 4核心，直接生长在导电集流体，允许快速电子传输;和介孔MnO 2壳具有巨大的表面积，用于快速离子扩散和密切的电极/电解质接触。此外，纳米结构的核和壳分别与电解质中的阴离子和阳离子发生氧化还原反应，这两者都对电化学电荷储存有很大贡献。(C)2014爱思唯尔有限公司版权所有。
ZnCo2O4/MnO2 nanocone forests with a mesoporous, hierarchical core-shell structure and a large surface area were hydrothermally grown on 3D nickel foam. The supercapacitor electrodes prepared from the unique structure exhibits exceptional specific capacitances of 2339 and 1526 F g(-1) at current densities of 1 and 10 A g(-1), respectively, and long-term capacity retention of similar to 95.9% after 3000 cycles at 2 A and 94.5% after 8000 cycles at 10 A g(-1). These values are proven to be the highest when the capacitances are compared between the current study and similar core/shell-structured metal oxide electrodes taken from the literature. Many synergistic effects are identified to be responsible for the observations: namely, highly conductive 3D Ni foam substrate that totally eliminate binders and conductive additives; high crystalline quality of the ZnCo2O4 core which is directly grown on the conductive current collector, allowing fast electron transport; and the mesoporous MnO2 shell with a huge surface area for fast ion diffusion and intimate electrode/electrolyte contact. In addition, the nanostructured core and shell have redox reactions with anions and cations from the electrolyte, respectively, both of which contribute much to electrochemical charge storage. (C) 2014 Elsevier Ltd. All rights reserved.