Porous manganese dioxide film built from arborization-like nanoclusters and its superior electrochemical supercapacitance with attractive cyclic stability
Porous manganese dioxide film built from arborization-like nanoclusters and its superior electrochemical supercapacitance with attractive cyclic stability
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由树枝状纳米团簇构建的多孔二氧化锰薄膜及其优异的电化学超级电容器和有吸引力的循环稳定性
DOI：
10.1016/j.electacta.2018.11.028
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发表时间：
2019-02
影响因子：
6.6
通讯作者：
Hao Xiaogang
中科院分区：
文献类型：
--
作者：
Xue Chunfeng;Hao Yanan;Luan Qiong;Wang Enyang;Ma Xuli;Hao Xiaogang
为了获得具有良好循环稳定性的上级比电容，首次采用单极脉冲电沉积法在Pt片上预包覆的多壁碳纳米管（MWCNT）上制备了树枝状纳米团簇结构的多孔MnO 2薄膜。所得复合电极MnO 2/MWCNT具有独特的纳米结构和良好的稳定性。在0.50 M Na_2SO_4溶液中，其比质量电容高达553.0 F/g。具有吸引力的电容性能可能是由于球形表面上的化学吸附-脱附和电解质离子与活性材料MnO 2之间的内部嵌入/脱嵌的协同效应。在5.0A/g的电流密度下，经过2000次充放电循环后，其比容量仍能保持初始比容量的97%以上。这种上级循环稳定性可能与MnO 2结晶良好、含有较多的Mn-O-Mn键和较少的Mn-O-H键有关。在恒电位法制备的MnO 2/MWCNT-PM中，电解质离子与活性MnO 2在其平坦表面上的简单化学吸附-脱附导致了其低电容性能。在充放电循环后，它只能保持约62%的第一个循环电容。循环稳定性差主要是由于低结晶度的MnO 2含有较多的Mn-O-H键而较少的Mn-O-Mn键。
To achieve superior specific capacitance with sound cyclic stability, porous manganese dioxide (MnO2) film built from arborization-like nanoclusters is deposited for the first time on multi-walled carbon nanotube (MWCNT) pre-covered onto Pt sheet by using a unipolar pulse electro-deposition method. The obtained composite electrode MnO2/MWCNT displays unique nanostructure and good stability. It displays specific mass capacitance as high as 553.0 F/g in 0.50 M Na2SO4solution. The attractive capacitance performance may contribute from the synergetic effects of chemical adsorption-desorption on the spherical surface and internal intercalation/deintercalation between electrolyte ions and active material MnO2. After 2000 charge/discharge cycles at the current density of 5.0 A/g, it can retain more than 97% of the initial specific capacitance. The superior cyclic stability may depend on the well crystallized MnO2containing more bond Mn-O-Mn but less bond Mn-O-H. In case of its counterpart MnO2/MWCNT-PM prepared using potentiostatic method, its low capacitance performance can be ascribed to the simply chemical adsorption-desorption on its flat surface between electrolyte ions and active MnO2. It can only retain about 62% of the first cycle capacitance after the charge/discharge cycles. The poor cyclic stability mainly depends on the lowly crystallized MnO2containing more bond Mn-O-H but less bond Mn-O-Mn.
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影响因子：
9.2
作者：
Dongfang Yang
通讯作者：
Dongfang Yang
影响因子：
8.4
作者：
Ghasemi, Shahram;Hosseini, Sayed Reza;Boore-talari, Omid
通讯作者：
Boore-talari, Omid
影响因子：
8.4
作者：
Zhongde Wang;Xiaogang Hao;Zhonglin Zhang;Shibin Liu;Zhenhai Liang;G. Guan
通讯作者：
Zhongde Wang;Xiaogang Hao;Zhonglin Zhang;Shibin Liu;Zhenhai Liang;G. Guan
影响因子：
--
作者：
Lei, Zhibin;Zhang, Jintao;Zhao, X. S.
通讯作者：
Zhao, X. S.
影响因子：
8.6
作者：
Brown, Billyde;Cordova, Isvar A.;Glass, Jeffrey T.
通讯作者：
Glass, Jeffrey T.