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The Different Roles of Cobalt and Manganese in Metal‐Organic Frameworks for Supercapacitors
Author(s) -
Iqbal Rashid,
Sultan Muhammad Qaisar,
Hussain Sabir,
Hamza Mathar,
Tariq Ayesha,
Akbar Muhammad Bilal,
Ma Yingjie,
Zhi Linjie
Publication year - 2021
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.202000941
Subject(s) - metal organic framework , supercapacitor , electrochemistry , materials science , electrode , cobalt , electrical conductor , nanotechnology , redox , metal ions in aqueous solution , metal , manganese , chemical engineering , chemistry , composite material , organic chemistry , metallurgy , adsorption , engineering
Conductive metal‐organic frameworks (MOFs) are promising electrode materials for supercapacitors (SCs) because of their tunable structures, high specific surface areas, and superior conductivity. However, it remains challenging to develop conductive MOFs for organic SCs and the role of metal ions in the electrochemical performance of MOFs is still unclear but is shown to be a key factor in determining MOFs performance. Herein, two high‐performance ultra‐thin redox conductive 2D MOFs (>6000 S m −1 ) for SCs are prepared, and the effects of metal ions on the capacitive performance of MOF electrodes are investigated. Co 2+ and Mn 2+ with the same ligand provide two MOFs featuring almost the same structures and specific surface areas but show great differences in electrochemical performance except that both MOFs exhibit outstanding electrochemical performance and good cycling stability with a capacity retention of >85% after 10 000 cycles. Different metal ions endow the two MOFs with different redox behaviors, conductivities, and energy levels, where Co‐MOF shows superior specific capacity compared to Mn‐MOF. This work expands the possibility of the use of MOFs in SCs and gives insight into the roles of metal ions in MOFs.