One-pot synthesis of hierarchical MnO2-modified diatomites for electrochemical capacitor electrodes
One-pot synthesis of hierarchical MnO2-modified diatomites for electrochemical capacitor electrodes
复制标题
一锅法合成电化学电容器电极用分级MnO2改性硅藻土
DOI：
10.1016/j.jpowsour.2013.07.115
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发表时间：
2014-01
影响因子：
9.2
通讯作者：
Wen, Zhong Quan
中科院分区：
文献类型：
--
作者：
Zhang, Yu Xin;Huang, Ming;Li, Fei;Wang, Xue Li;Wen, Zhong Quan
首次采用一锅水热法制备了二氧化锰修饰硅藻土的层次化多孔结构。利用聚焦离子束扫描电镜（FIB/SEM）和x射线衍射光谱（XRD）研究了二氧化锰改性硅藻土分层结构的形貌和结构。结果表明：二氧化锰纳米片在纯化硅藻土上垂直生长，形成层次化结构；通过循环伏安图、恒流充放电试验和电化学阻抗谱分析，研究了mno2修饰硅藻土电极在1 M na2so4电解液中的电化学性能。电化学结果表明，二氧化锰修饰硅藻土电极具有高可逆性和良好的速率能力。值得注意的是，硅藻土蚀刻后mno2修饰硅藻土的比电容为202.6 F g−1，mno2纳米结构的比电容为297.8 F g−1。在5000次循环中，电容保持率达到95.92%，进一步表明低成本二氧化锰修饰硅藻土结构作为超级电容器电极材料的适用性。
The hierarchical and porous MnO2-modified diatomite structures are prepared for the first time by a one-pot hydrothermal method. The morphology and structure of MnO2-modified diatomite hierarchical structures are examined by focus ion beam scanning electron microscopy (FIB/SEM) and X-ray diffraction spectroscopy (XRD). The results show that Birnessite-type MnO2nanosheets are observed to grow vertically on the purified diatomite, thus building hierarchical architecture. Furthermore, the electrochemical properties of the MnO2-modified diatomite electrodes are elucidated by cyclic voltammograms, galvanostatic charge/discharge tests and electrochemical impedance spectroscopy in 1 M Na2SO4electrolyte. The electrochemical results demonstrate that the MnO2-modified diatomite electrode exhibits highly reversible features and good rate abilities, respectively. Significantly, it exhibits the specific capacitance of 202.6 F g−1for the MnO2-modified diatomite and 297.8 F g−1for the MnO2nanostructures after etching the diatomite. The capacitance retention of 95.92% over 5000 cycles further indicates the suitability of the low-cost MnO2-modified diatomite structure as a potential electrode material for supercapacitors.
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