锰
氧化还原
超级电容器
电化学
价(化学)
煅烧
无机化学
电解质
电容
循环伏安法
化学
假电容
双锰矿
材料科学
氧化锰
催化作用
电极
物理化学
有机化学
生物化学
作者
Xing Chen,Lei Li,Xiaoli Wang,Kun Xie,Yuqiao Wang
标识
DOI:10.1002/chem.202100113
摘要
Abstract Manganese oxides have attracted great interest in electrochemical energy storage due to high theoretical specific capacitance and abundant valence states. The multiple valence states in the redox reactions are beneficial for enhancing the electrochemical properties. Herein, three manganese microspheres were prepared by a one‐pot hydrothermal method and subsequent calcination at different temperatures using carbon spheres as templates. The trivalent manganese of Mn 2 O 3 exhibited multiple redox transitions of Mn 3+ /Mn 2+ and Mn 4+ /Mn 3+ during the intercalation/deintercalation of electrolyte ions. The possible redox reactions of Mn 2 O 3 were proposed based on the cyclic voltammetry and differential pulse voltammogram results. Mn 2 O 3 microsphere integrated the advantages of multiple redox couples and unique structure, demonstrating a high specific capacitance and long cycling stability. The symmetric Mn 2 O 3 //Mn 2 O 3 device yielded a maximum energy density of 29.3 Wh kg −1 at 250 W kg −1 .
科研通智能强力驱动
Strongly Powered by AbleSci AI