双金属片
钴
储能
硫化物
电解质
金属有机骨架
氧化还原
锰
材料科学
电极
超级电容器
硫化钴
化学工程
氧化物
金属
无机化学
石墨烯
氧化钴
电容
化学
纳米技术
电化学
冶金
有机化学
物理化学
吸附
量子力学
工程类
物理
功率(物理)
作者
Tsai Mu Cheng,Chi‐Ming Hsieh,Li-Dan Shang,Yuanyuan Fan,Sibidou Yougbaré,Lu–Yin Lin,Yung‐Fu Wu
标识
DOI:10.1016/j.est.2023.107730
摘要
Metal organic framework (MOF) with large surface area and pore tunability has been intensively applied on energy storage. Tubular structure is one of promising configurations due to abundant contacts to electrolyte at inner/outer surface and straight charge transfer paths. Bimetallic compounds with multiple redox states are favorable for generating redox reactions. Possible conversions to oxides or sulfides can also induce additional active sites and enhance conductivity. In this study, cobalt and manganese bimetallic MOF (CoMn-MOF) tubular structures are firstly synthesized using polypyrrole nanotubes as the template. Effects of metal ratio on energy storage is investigated to understand contributions from Co and Mn. The CoMn-MOF derived oxide and sulfide are further synthesized to enhance energy storage ability. A larger specific capacitance (CF) of 670.1 F/g is attained for CoMn-MOF derived sulfide (S-CoMn-MOF) electrode, respectively compared to those of 247.0 and 426.7 F/g for the CoMn-MOF and oxidized CoMn-MOF electrodes, because of surface connected tubular structure and balanced components of MOF and sulfides for S-CoMn-MOF. An energy storage device with S-CoMn-MOF and graphene electrodes shows a maximum energy density of 17.9 Wh/kg at 785.7 W/kg. The CF retention of 78% and Coulombic efficiency of 97% after 10,000 charge/discharge cycles are also obtained.
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