硒
复合数
阴极
电化学
锂(药物)
循环伏安法
材料科学
电解质
纳米颗粒
溶解
金属有机骨架
金属
氧化物
化学工程
无机化学
化学
纳米技术
电极
吸附
冶金
复合材料
物理化学
有机化学
内分泌学
工程类
医学
作者
Wenkai Ye,Weiyang Li,Ke Wang,Weihao Yin,Wenwen Chai,Yi Qu,Yichuan Rui,Bohejin Tang
标识
DOI:10.1021/acs.jpcc.8b10598
摘要
In this study, metal organic frameworks (MOFs) are prepared as a support to tether active selenium through melt-diffused method, in which MnO2 nanoparticles are loaded on the surface of a Co-MOF (ZIF-67) through simple postmodification means. Selenium is uniformly dispersed on the surface of ZIF-67, and MnO2 nanoparticles (∼5 nm in diameter) are coated on the surface of Se. As an analogue of sandwich, the MOF@Se@metal-oxide structure can inhibit the shuttle effect and dissolution of polyselenides in the electrolyte, which is confirmed by the cyclic voltammetry, galvanostatic discharge/charge, and electrochemical impedance tests. In addition, the cathode displays an excellent electrochemical performance. Especially, the discharge capacity of the ZIF-67@Se@MnO2 cathode is 329 mA h g–1 after 100 cycles at 1C (C = 675 mA g–1) with the high capacity retention of 83.7%. Furthermore, the ZIF-67@Se@MnO2 cathode displays stable capacities of 273 and 232 mA h g–1 after 100 cycles at 2C and 5C, respectively.
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