Effects of metal ratios and post treatments on energy storage ability of cobalt manganese metal organic frameworks

Tsai Mu Cheng, Chi Hong Hsieh, Li Dan Shang, Yu Min Fan, Sibidou Yougbaré, Lu Yin Lin, Yung Fu Wu

研究成果: 雜誌貢獻文章同行評審

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.
原文英語
文章編號107730
期刊Journal of Energy Storage
68
DOIs
出版狀態已發佈 - 9月 15 2023

ASJC Scopus subject areas

  • 可再生能源、永續發展與環境
  • 能源工程與電力技術
  • 電氣與電子工程

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