高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (3): 530-536.doi: 10.7503/cjcu20170343

• 物理化学 • 上一篇    下一篇

掺铋α-MnO2纳米棒的合成及超电容性能

王丰梅, 徐光伟, 金成昌()   

  1. 苏州大学物理与光电能源学部, 苏州 215006
  • 收稿日期:2017-06-05 出版日期:2018-03-10 发布日期:2018-01-13
  • 作者简介:联系人简介: 金成昌, 男, 教授, 主要从事化学电源及其材料的开发与应用研究. E-mail:jinchengchang@suda.edu.cn

Synthesis and Electrochemical Performance for Supercapacitors of Bi-doped α-MnO2 Nanorods

WANG Fengmei, XU Guangwei, JIN Chengchang*()   

  1. College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, China
  • Received:2017-06-05 Online:2018-03-10 Published:2018-01-13
  • Contact: JIN Chengchang E-mail:jinchengchang@suda.edu.cn

摘要:

采用水热法合成了掺铋α-MnO2纳米棒, 通过X射线衍射(XRD)、 X射线光电子能谱(XPS)、 扫描电子显微镜(SEM)、 透射电子显微镜(TEM)、 循环伏安(CV)、 恒电流充放电和电化学阻抗谱(EIS)等手段对材料的结构及电化学性能进行了表征. 结果表明, 铋以Bi3+形式掺杂于α-MnO2的晶格之中; 掺铋α-MnO2纳米棒的电化学性能比未掺铋α-MnO2有明显改善, 在1 A/g的电流密度下, 比电容(265 F/g)比同条件合成的未掺铋α-MnO2(129 F/g)提高约1.05倍, 1 A/g电流密度下循环2000周后容量保持率为95%.

关键词: 二氧化锰纳米棒, 超级电容器, 铋掺杂

Abstract:

Bi-doped α-MnO2 nanorods were synthetized by a hydrothermal method. Their crystal structures and electrochemical performance were characterized by X-ray diffraction, X-ray photoelectron spectrometry, scanning electron microscopy, transmission electron microscopy, cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The results suggest that the bismuth element is doped into the crystal lattice of α-MnO2. The electrochemical performance of Bi-doped α-MnO2 is notably improved compared with that of pure α-MnO2. The specific capacitance of Bi-doped α-MnO2 nanorods can reach 265 F/g at a current density of 1 A/g, which is 1.05 times higher than that of no Bi-doped α-MnO2 (129 F/g) synthesized under the same conditions. The capacity retention ratio of Bi-doped α-MnO2 nanorods can reach 95% after 2000 cycles, higher than that of the no Bi-doped α-MnO2 synthesized under the same conditions. Therefore, Bi doping is helpful to improve the performance of α-MnO2 as electrode materials for supercapacitor.

Key words: Manganese dioxide nanorods, Supercapacitor, Bi-doping

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